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Abstract The Maintenance of Lipid Asymmetry (Mla) pathway is a multicomponent system found in all gram-negative bacteria that contributes to virulence, vesicle blebbing and preservation of the outer membrane barrier function. It acts by removing ectopic lipids from the outer leaflet of the outer membrane and returning them to the inner membrane through three proteinaceous assemblies: the MlaA-OmpC complex, situated within the outer membrane; the periplasmic phospholipid shuttle protein, MlaC; and the inner membrane ABC transporter complex, MlaFEDB, proposed to be the founding member of a structurally distinct ABC superfamily. While the function of each component is well established, how phospholipids are exchanged between components remains unknown. This stands as a major roadblock in our understanding of the function of the pathway, and in particular, the role of ATPase activity of MlaFEDB is not clear. Here, we report the structure of E. coli MlaC in complex with the MlaD hexamer in two distinct stoichiometries. Utilising in vivo complementation assays, an in vitro fluorescence-based transport assay, and molecular dynamics simulations, we confirm key residues, identifying the MlaD β6-β7 loop as essential for MlaCD function. We also provide evidence that phospholipids pass between the C-terminal helices of the MlaD hexamer to reach the central pore, providing insight into the trajectory of GPL transfer between MlaC and MlaD.

Abstract Background Evidence on workplace bullying and harassment (WBH) in the UK has not used probability-sample surveys with robust mental health assessments. This study aimed to profile the prevalence and nature of WBH in England, identify inequalities in exposure, and quantify adjusted associations with mental health. Methods Data were from the 2014 Adult Psychiatric Morbidity Survey, a cross-sectional probability-sample survey of the household population in England. Criteria for inclusion in the secondary analysis were being aged 16–70 years and in paid work in the past month (n = 3838). Common mental disorders (CMDs) were assessed using the Clinical Interview Schedule-Revised and mental wellbeing using the Warwick-Edinburgh Mental Wellbeing Scale. Analyses were weighted. We examined associations between past-year WBH and current CMD using multivariable regression modelling, adjusting for sociodemographic factors. Interaction terms tested for gender differences in associations. The study received ethical approval (ETH21220–299). Results One in ten employees (10.6%, n = 444/3838) reported past-year experience of WBH, with rates higher in women (12.2%, n = 284/2189), those of mixed, multiple, and other ethnicity (21.0%, n = 15/92), and people in debt (15.2%, n = 50/281) or living in cold homes (14.6%, n = 42/234). Most commonly identified perpetrators of WBH were line managers (53.6%, n = 244/444) or colleagues (42.8%, n = 194/444). Excessive criticism (49.3%, n = 212/444), verbal abuse (42.6%, n = 187/444), and humiliation (31.4%, n = 142/444) were the most common types. WBH was associated with all indicators of poor mental health, including CMD (adjusted odds ratio [aOR] 2.65, 95% CI 2.02–3.49), and 11 of 14 mental wellbeing indicators, including lower levels of confidence (aOR 0.57, 0.46–0.72) and closeness to others (aOR 0.57, 0.46–0.72). Patterns of association between WBH and mental health were similar in men and women. Conclusions These findings reinforce a need for more cohesive UK legislation against WBH; guidance on recognition of bullying behaviours for employees, managers, and human resources, focusing on prevention and early intervention, and increased awareness of the impact of WBH on mental health among health service practitioners. Limitations include reliance on cross-sectional data collected before pandemic-related and other changes in workplace practices. Longitudinal data are needed to improve evidence on causality and the longevity of mental health impacts.

Abstract Inoviruses are filamentous phages infecting numerous prokaryotic phyla. Inoviruses can self-assemble into mesoscale structures with liquid-crystalline order, termed tactoids, which protect bacterial cells in Pseudomonas aeruginosa biofilms from antibiotics. Here, we investigate the structural, biophysical, and protective properties of tactoids formed by the P. aeruginosa phage Pf4 and Escherichia coli phage fd. A cryo-EM structure of the capsid from fd revealed distinct biochemical properties compared to Pf4. Fd and Pf4 formed tactoids with different morphologies that arise from differing phage geometries and packing densities, which in turn gave rise to different tactoid emergent properties. Finally, we showed that tactoids formed by either phage protect rod-shaped bacteria from antibiotic treatment, and that direct association with a tactoid is required for protection, demonstrating the formation of a diffusion barrier by the tactoid. This study provides insights into how filamentous molecules protect bacteria from extraneous substances in biofilms and in host-associated infections.

Abstract Cryo-electron microscopy (cryo-EM) enables the determination of membrane protein structures in native-like environments. Characterising how membrane proteins interact with the surrounding membrane lipid environment is assisted by resolution of lipid-like densities visible in cryo-EM maps. Nevertheless, establishing the molecular identity of putative lipid and/or detergent densities remains challenging. Here we present LipIDens, a pipeline for molecular dynamics (MD) simulation-assisted interpretation of lipid and lipid-like densities in cryo-EM structures. The pipeline integrates the implementation and analysis of multi-scale MD simulations for identification, ranking and refinement of lipid binding poses which superpose onto cryo-EM map densities. Thus, LipIDens enables direct integration of experimental and computational structural approaches to facilitate the interpretation of lipid-like cryo-EM densities and to reveal the molecular identities of protein-lipid interactions within a bilayer environment. We demonstrate this by application of our open-source LipIDens code to ten diverse membrane protein structures which exhibit lipid-like densities.

Abstract Insertion of lipopolysaccharide (LPS) into the bacterial outer membrane (OM) is mediated by a druggable OM translocon consisting of a β-barrel membrane protein, LptD, and a lipoprotein, LptE. The β-barrel assembly machinery (BAM) assembles LptD together with LptE at the OM. In the enterobacterium Escherichia coli, formation of two native disulfide bonds in LptD controls translocon activation. Here we report the discovery of LptM (formerly YifL), a lipoprotein conserved in Enterobacteriaceae, that assembles together with LptD and LptE at the BAM complex. LptM stabilizes a conformation of LptD that can efficiently acquire native disulfide bonds, whereas its inactivation makes disulfide bond isomerization by DsbC become essential for viability. Our structural prediction and biochemical analyses indicate that LptM binds to sites in both LptD and LptE that are proposed to coordinate LPS insertion into the OM. These results suggest that, by mimicking LPS binding, LptM facilitates oxidative maturation of LptD, thereby activating the LPS translocon.

Abstract Peptidoglycan (PG) is an essential structural component of the bacterial cell wall that is synthetized during cell division and elongation. PG forms an extracellular polymer crucial for cellular viability, the synthesis of which is the target of many antibiotics. PG assembly requires a glycosyltransferase (GT) to generate a glycan polymer using a Lipid II substrate, which is then crosslinked to the existing PG via a transpeptidase (TP) reaction. A Shape, Elongation, Division and Sporulation (SEDS) GT enzyme and a Class B Penicillin Binding Protein (PBP) form the core of the multi-protein complex required for PG assembly. Here we used single particle cryo-electron microscopy to determine the structure of a cell elongation-specific E. coli RodA-PBP2 complex. We combine this information with biochemical, genetic, spectroscopic, and computational analyses to identify the Lipid II binding sites and propose a mechanism for Lipid II polymerization. Our data suggest a hypothesis for the movement of the glycan strand from the Lipid II polymerization site of RodA towards the TP site of PBP2, functionally linking these two central enzymatic activities required for cell wall peptidoglycan biosynthesis.

Abstract Cyclic di-AMP is the only known essential second messenger in bacteria and archaea, regulating different proteins indispensable for numerous physiological processes. In particular, it controls various potassium and osmolyte transporters involved in osmoregulation. In Bacillus subtilis, the K+/H+ symporter KimA of the KUP family is inactivated by c-di-AMP. KimA sustains survival at potassium limitation at low external pH by mediating potassium ion uptake. However, at elevated intracellular K+ concentrations, further K+ accumulation would be toxic. In this study, we reveal the molecular basis of how c-di-AMP binding inhibits KimA. We report cryo-EM structures of KimA with bound c-di-AMP in detergent solution and reconstituted in amphipols. By combining structural data with functional assays and molecular dynamics simulations we reveal how c-di-AMP modulates transport. We show that an intracellular loop in the transmembrane domain interacts with c-di-AMP bound to the adjacent cytosolic domain. This reduces the mobility of transmembrane helices at the cytosolic side of the K+ binding site and therefore traps KimA in an inward-occluded conformation.

OBJECTIVE: Previous literature has established associations between psychosocial working conditions and sickness absence (SA), but only few studies have examined associations among younger employees. This study aimed to investigate associations between psychosocial working conditions and SA among employees, aged 15–30 years, who entered the labor market in Denmark between 2010 and 2018.METHOD: We followed 301 185 younger employees in registers for on average 2.6 years. Using job exposure matrices, we assessed job insecurity, quantitative demands, decision authority, job strain, emotional demands, and work-related physical violence. Adjusted rate ratios of SA spells of any length were estimated for women and men separately with Poisson models.RESULTS: Among women, employment in occupations with high quantitative demands, low decision authority, high job strain, high emotional demands, or high work-related physical violence was associated with higher rates of SA. Being employed in occupations with high versus low emotional demands showed the strongest association with SA, with a rate ratio of 1.44 [95% confidence interval (CI) 1.41–1.47]. Among men, being employed in occupations with low decision authority showed the strongest association with SA (1.34, 95% CI 1.31–1.37), whereas occupations with high quantitative demands, high job strain, and high emotional demands were associated with lower rates of SA.CONCLUSION: We found that several psychosocial working conditions were associated with SA spells of any length. Associations with SA spells of any length resemble associations with long-term SA, suggesting that results from previous studies on long-term SA may be generalizable to all lengths of SA among younger employees.

ABSTRACT Motile bacteria employ conserved chemotaxis networks to detect chemical gradients in their surroundings and effectively regulate their locomotion, enabling the location of essential nutrients and other important biological niches. The sensory apparatus of the chemotaxis pathway is an array of core-signaling units (CSUs) composed of transmembrane chemoreceptors, the histidine kinase CheA and an adaptor protein, CheW. Although chemotaxis pathways represent the best understood signaling systems, a detailed mechanistic understanding of signal transduction has been hindered by the lack of a complete structural picture of the CSU and extended array. In this study, we present the structure of the complete CSU from phage φX174 E protein lysed Escherichia coli cells, determined using cryo-electron tomography and sub-tomogram averaging to 12-Å resolution. Using AlphaFold2, we further predict the atomic structures of the CSU’s constituent proteins as well as key protein-protein interfaces, enabling the assembly an all-atom CSU model, which we conformationally refine using our cryo-electron tomography map. Molecular dynamics simulations of the resulting model provide new insight into the periplasmic organization of the complex, including novel interactions between neighboring receptor ligand-binding domains. Our results further elucidate previously unresolved interactions between individual CheA domains, including an anti-parallel P1 dimer and non-productive binding mode between P1 and P4, enhancing our understanding of the structural mechanisms underlying CheA signaling and regulation. IMPORTANCE Bacterial chemotaxis is a ubiquitous behavior that enables cell movement toward or away from specific chemicals. It serves as an important model for understanding cell sensory signal transduction and motility. Characterization of the molecular mechanisms underlying chemotaxis is of fundamental interest and requires a high-resolution structural picture of the sensing machinery, the chemosensory array. In this study, we combine cryo-electron tomography and molecular simulation to present the complete structure of the core signaling unit, the basic building block of chemosensory arrays, from Escherichia coli. Our results provide new insight into previously poorly-resolved regions of the complex and offer a structural basis for designing new experiments to test mechanistic hypotheses.

Abstract Objectives Pre-trial acceptability studies may boost recruitment, especially in trials comparing distinctly different interventions. We evaluated the impact of an acceptability study on recruitment to a randomised trial of antipsychotic reduction versus maintenance treatment and explored demographic and clinical predictors of subsequent enrolment. Methods Participants with a diagnosis of a schizophrenia spectrum disorder who were taking antipsychotic medication were interviewed about their views of taking part in a future trial. Results In a sample of 210 participants, 151 (71.9%) expressed an interest in taking part in the future trial, 16 (7.6%) said they might be interested, and 43 (20.5%) said they were not. Altruistic reasons were most commonly given for wanting to take part, and concern about randomisation for not wanting to. Ultimately 57 people enrolled in the trial (27.1% of the original sample). Eighty-five people who initially expressed an interest did not enrol due to declining or not being eligible (for clinical reasons). Women and people from a white ethnic background were more likely to enrol in the trial, but no illness or treatment-related characteristics were associated with enrolment. Conclusion An acceptability study can be a useful tool for recruitment to challenging trials, but it may over-estimate recruitment.

Abstract Background To better understand the initial phases of sickness absence due to common mental disorders (CMD), the aim of the present video vignette study was to test the following three hypotheses: (1) Managers who have negative attitudes towards employees with CMD will not recommend sick leave. (2) Managers with experience of CMD recommend sick leave to a significantly higher extent than managers lacking this experience. (3) Managers with previous experience of recommending sick leave for people with CMD will recommend sick leave to a significantly higher extent also based on the vignettes. Methods An online survey, including a CMD-labelled video vignette, was sent to 4737 Swedish managers (71% participated, n = 3358). For aims (1) and (2), a study sample consisting of 2714 managers was used. For aim (3), due to the design of the survey questions, a subsample (n = 1740) was used. Results There was no significant association between negative attitudes towards employee depression and managers’ recommendation of employee sick leave with the vignette case. The bivariate analysis showed that personal experience of CMD was associated with managers’ recommendation of employee sick leave. In the adjusted regression model, it became non-significant. Previous experience of recommending sick leave to one employee and to several employees was associated with recommending sick leave, also when adjusting for gender, level of education, years of managerial experience, and management training on CMDs Conclusions The likelihood of a manager recommending sick leave after watching a CMD-labelled video vignette was higher if the manager had previous experience of this situation in real life. This study highlights the importance of including managerial behaviours and attitudes to better understand sick leave among employees with CMD.

CD59 protects human cells from damage by the MAC immune pore. The authors show how CD59 inhibits MAC, by deflecting pore-forming β-hairpins of complement proteins. As well as how the membrane environment influences the role of CD59 in complement regulation and in host-pathogen interactions.

The jumbo contractile bacteriophage, Kp24, has been isolated from clinical strains of Klebsiella pneumonia. Here, the authors present structural and functional insight into the capsid, tail and tail fibres and how this impacts infectivity.

Background Poor air quality is associated with poor health. Little attention is given to the complex array of environmental exposures and air pollutants that affect mental health during the life course. Aims We gather interdisciplinary expertise and knowledge across the air pollution and mental health fields. We seek to propose future research priorities and how to address them. Method Through a rapid narrative review, we summarise the key scientific findings, knowledge gaps and methodological challenges. Results There is emerging evidence of associations between poor air quality, both indoors and outdoors, and poor mental health more generally, as well as specific mental disorders. Furthermore, pre-existing long-term conditions appear to deteriorate, requiring more healthcare. Evidence of critical periods for exposure among children and adolescents highlights the need for more longitudinal data as the basis of early preventive actions and policies. Particulate matter, including bioaerosols, are implicated, but form part of a complex exposome influenced by geography, deprivation, socioeconomic conditions and biological and individual vulnerabilities. Critical knowledge gaps need to be addressed to design interventions for mitigation and prevention, reflecting ever-changing sources of air pollution. The evidence base can inform and motivate multi-sector and interdisciplinary efforts of researchers, practitioners, policy makers, industry, community groups and campaigners to take informed action. Conclusions There are knowledge gaps and a need for more research, for example, around bioaerosols exposure, indoor and outdoor pollution, urban design and impact on mental health over the life course.

Background People with dementia find it increasingly difficult to carry out daily activities (activities of daily living), and may require increasing support from family carers. Researchers in the Netherlands developed the Community Occupational Therapy in Dementia intervention, which was delivered in 10 1-hour sessions over 5 weeks to people with dementia and their family carers at home. Community Occupational Therapy in Dementia was found to be clinically effective and cost-effective. Objectives Translate and adapt Community Occupational Therapy in Dementia to develop the Community Occupational Therapy in Dementia - the UK version intervention and training programme and to optimise its suitability for use within the UK. To estimate the clinical effectiveness and cost-effectiveness of Community Occupational Therapy in Dementia - the UK version for people with mild to moderate dementia and their family carers compared with treatment as usual. Design The development phase used mixed methods to develop Community Occupational Therapy in Dementia - the UK version: translation, expert review, and adaptation of the manual and training materials; training occupational therapists; focus groups and interviews, including occupational therapists, managers, people with dementia and family carers; consensus conference; and an online survey of occupational therapists to scope UK practice. A multicentre, two-arm, parallel-group, single-blind individually randomised pragmatic trial was preceded by an internal pilot. Pairs were randomly allocated between Community Occupational Therapy in Dementia - the UK version and treatment as usual. A cost–utility analysis, fidelity study and qualitative study were also completed. Setting Community services for people with dementia across England. Participants People with mild to moderate dementia recruited in pairs with a family carer/supporter. Interventions Community Occupational Therapy in Dementia - the UK version is an activity-based, goal-setting approach for people with dementia and family carers, and is delivered at home by an occupational therapist for 10 hours over 10 weeks. Treatment as usual comprised the usual local service provision, which may or may not include standard occupational therapy. Main outcome measures Data were collected through interviews conducted in person with dyads at baseline and at 12 and 26 weeks post randomisation, and then over the telephone with a reduced sample of just carers at 52 and 78 weeks post randomisation. The primary outcome was the Bristol Activities of Daily Living Scale at 26 weeks. The secondary outcomes were as follows: person with dementia – cognition, activities of daily living, quality of life and mood; carer – sense of competence, quality of life and mood; all participants – social contacts, leisure activities and serious adverse events. Results The Community Occupational Therapy in Dementia manual and training materials were translated and reviewed. In total, 44 occupational therapists were trained and delivered Community Occupational Therapy in Dementia to 130 pairs. A total of 197 occupational therapists completed the survey, of whom 138 also provided qualitative data. In total, 31 people attended the consensus conference. Community Occupational Therapy in Dementia - the UK version has more flexibility than Community Occupational Therapy in Dementia in terms of content and delivery; for example, occupational therapists can use the wider range of assessment tools that are already in regular use within UK practice and the time span for delivery is 10 weeks to better meet the needs of pairs and be more feasible for services to deliver. In total, 31 occupational therapists provided Community Occupational Therapy in Dementia - the UK version within the randomised controlled trial. A total of 468 pairs were randomised (249 pairs to Community Occupational Therapy in Dementia - the UK version, 219 pairs to treatment as usual). People with dementia ranged in age from 55 to 97 years (mean 78.6 years), and family carers ranged in age from 29 to 94 years (mean 69.1 years). The majority of those with dementia (74.8%) were married; 19.2% lived alone. Most family carers (72.6%) were spouses but 22.2% were adult children. At 26 weeks, 406 (87%) pairs remained in the trial, and the Bristol Activities of Daily Living Scale total score did not differ at the 5% level when comparing groups (adjusted mean difference estimate 0.35, 95% confidence interval –0.81 to 1.51; p = 0.55). The adjusted (for baseline Bristol Activities of Daily Living Scale total score and randomised group) intracluster correlation coefficient estimate at week 26 was 0.043. There were no significant differences in secondary outcomes. At 52 and 78 weeks, there were no differences between the two groups in Bristol Activities of Daily Living Scale total score and secondary outcomes. The probability that Community Occupational Therapy in Dementia - the UK version is cost-effective at a threshold of willingness to pay per quality-adjusted life-year of £20,000 is 0.02%. In the qualitative interviews, participants reported positive benefits and outcomes. Of the 249 pairs allocated to Community Occupational Therapy in Dementia - the UK version, 227 reached the goal-setting phase, and 838 of the 920 goals set (90.8%) were fully or partially achieved. Limitations The development phase took longer than estimated because of translation time and organisational delays in delivering the intervention. Recruitment to the randomised controlled trial took longer than expected. Fidelity overall was moderate, with variation across sites and therapists. It is possible that Community Occupational Therapy in Dementia - the UK version did not work well in the UK service model in which usual care differs from that in the Netherlands. Conclusions This programme used a rigorous process to develop Community Occupational Therapy in Dementia - the UK version but found no statistical evidence of clinical effectiveness or cost-effectiveness compared with usual care. Qualitative findings provided positive examples of how Community Occupational Therapy in Dementia - the UK version had enabled people to live well with dementia. Future work Developing tools to measure more meaningful outcomes, such as goals achieved or the quantity and quality of activity participation, with less reliance on proxy data, to collect the views and experiences of people with dementia themselves. Trial registration This trial was registered as ISRCTN10748953 (WP3 and WP4). Funding This project was funded by the National Institute for Health and Care Research (NIHR) Programme Grants for Applied Research programme and will be published in full in Programme Grants for Applied Research; Vol. 11, No. 5. See the NIHR Journals Library website for further project information. Plain language summary Maintaining everyday and meaningful activities can be difficult for a person with dementia. Their family carer/supporter can feel stressed from needing to give increasing support. Occupational therapists assist people to improve their health and well-being by helping them to do the activities that are important to them. Dutch researchers developed an occupational therapy programme for people with mild to moderate dementia and their supporters. Delivered at home, it improved the person’s ability to carry out daily activities, plus their mood and quality of life. Supporters’ sense of competence, mood and quality of life also improved, and it was also value for money. We built on this by translating and adapting the Dutch materials to develop a version better suited to the UK health and social care services context: Community Occupational Therapy in Dementia – UK version. The Community Occupational Therapy in Dementia – UK version comprises 10 hours of occupational therapy provided at home over 10 weeks. We tested whether or not it was more beneficial in terms of helping people with dementia to continue with activities and improving mood and quality of life than the usual service provided (treatment as usual), which may or may not include occupational therapy. In total, 468 pairs comprising a person with dementia and their supporter agreed to take part. Pairs were allocated at random to receive either The Community Occupational Therapy in Dementia – UK version or treatment as usual. We asked questions about daily activities performance, quality of life, mood, and the health and social care services used. We did this at the beginning of the programme and again at 12, 26, 52 and 78 weeks. The statistical analysis showed no evidence that Community Occupational Therapy in Dementia – UK version benefited the pairs on the outcomes selected or was value for money compared with the usual care already provided. We spoke in depth to some of the pairs and occupational therapists who participated in Community Occupational Therapy in Dementia – UK version, and they provided positive examples of meaningful activities that they had resumed or established as a result of the programme. Future research should develop ways of measuring the outcomes that really matter to people with dementia and their supporters, and to collect the views of people with dementia themselves. Scientific summary Background People with dementia find it increasingly difficult to carry out activities, and require increasing support from their family carers, who often experience stress. Occupational therapists support people to improve their health and well-being by enabling them to participate in activities that are meaningful to them. Researchers in the Netherlands developed the Community Occupational Therapy in Dementia (COTiD) intervention, in which occupational therapists delivered in 10 1-hour sessions over 5 weeks to people with mild to moderate dementia and their family carers at home. The Dutch researchers found that COTiD improved the person with dementia’s ability to perform daily living activities [activities of daily living (ADL)], quality of life and mood; improved their family carer’s sense of competence, quality of life and mood; and was cost-effective. Aims and objectives The aim of this applied research programme funded by the National Institute for Health and Care Research (NIHR) was to translate, adapt, evaluate and implement this community occupational therapy intervention designed to promote independence, meaningful activity and quality of life for people with mild to moderate dementia, and thus to benefit their family carers. Objectives •To translate and adapt COTiD into the Community Occupational Therapy in Dementia – UK version (COTiD-UK) intervention and training programme and optimise it for UK use. •To test the feasibility of implementing COTiD within UK health and social care services. •To field test the proposed outcome measures through an internal pilot trial of COTiD-UK compared with treatment as usual (TAU). •To estimate the effectiveness of COTiD-UK in improving the functional independence of people with mild to moderate dementia through a multicentre, pragmatic, single-blind, randomised controlled trial (RCT). •To evaluate cost-effectiveness of COTiD-UK compared with TAU. •To assess the implementation of COTiD-UK through monitoring and budget impact analysis. •To widely disseminate the findings of the Valuing Active Life in Dementia (VALID) research programme. The programme consisted of three phases, including five work packages (WPs): development (WP1 and WP2), piloting and evaluation (WP3 and WP4), and implementation (WP5). Development phase (work packages 1 and 2) Aim To translate and adapt the COTiD guideline and training package to optimise its suitability for use within the UK and, therefore, develop the COTiD-UK intervention ready for evaluation in WP3 and WP4. Method We used a mixed-methods approach, including the following activities. Work package 1: translation and adaptation This WP included the translation, expert review and adaptation of the manual and training materials used to train occupational therapists to deliver COTiD sessions to ‘pairs’ or dyads, comprising a person with mild to moderate dementia and their family carer; focus groups with occupational therapists who delivered COTiD, people with dementia and family carers who had not received COTiD; and semistructured interviews with pairs who had taken part in COTiD, managers of occupational therapists who delivered COTiD, and professionals who had referred pairs to receive COTiD. Finally, a consensus conference was held to finalise the content of the UK version of the intervention, COTiD-UK, with people with dementia and family carers, some of whom had participated in COTiD; occupational therapists who had received the training and delivered COTiD; and managers and other team members. Work package 2: survey of current practice This WP comprised an online survey collecting both quantitative and qualitative data from occupational therapists to scope current UK occupational therapy practice for people with dementia and their carers. Results Work package 1: translation and adaption We established a reference group of UK occupational therapists with experience of working with people with dementia and their family carers in practice. They provided expert opinion and guidance throughout the programme independent of the research team. This Occupational Therapy Reference Group reviewed the translated intervention and training materials, which were then adapted in consultation with the original author. We trained 44 occupational therapists from 10 organisations to deliver COTiD, of whom 28 took part in one of five focus groups. A total of 130 pairs took part in the COTiD sessions. We conducted semistructured interviews with nine pairs: four managers and five referrers. Thirty-nine people who had not received COTiD took part in one of six focus groups. Thirty-one people attended the consensus conference. Work package 2: survey of current practice A total of 230 occupational therapists consented to take part, of whom 197 (86%) provided quantitative data and 138 (60%) provided qualitative data also. Over half of the respondents undertook primarily profession-specific work. Occupational therapy-specific assessments were the most common profession-specific task, and the median time spent per person with dementia was 2.5 hours. Conclusion This phase took twice as long to complete as planned, partly because we underestimated the time needed to complete translation and partly because several organisational and governance issues delayed the occupational therapists delivering the intervention in practice, which in turn delayed the remainder of the data collection activities. We developed the COTiD-UK intervention ready for evaluation in WP3 and WP4. COTiD-UK retains the same aim and principles as COTiD, in that it aims to enable the person with dementia and family carer to carry out meaningful activities. This is achieved through adapting the environment and activity and coaching the family carer in problem-solving and supervision skills. It is similar to COTiD in that it comprises 10 hours of face-to-face intervention provided at home but is more flexible in content and delivery. For example, occupational therapists can use a wider range of assessment and intervention tools that are already in regular use within UK practice, and the time span for delivery is extended from 5 to 10 weeks to better meet the needs of pairs and be more feasible for service delivery. We restructured the training programme into 2 consecutive days followed by a third day once the therapists had delivered COTiD-UK in practice. We also used audio-recording rather than video-recording for the competence assessment process to better meet the needs of UK occupational therapists, many of whom had extensive experience of working with people living with dementia and their family carers or in the community. Piloting and evaluation phase (work packages 3 and 4) Aims Work package 3: internal pilot trial The aim of WP3 was to field test the outcome measures and trial procedures, and finalise the COTiD-UK intervention training, mode of delivery and supervision. Work package 4: full randomised controlled trial To estimate the clinical effectiveness and cost-effectiveness of COTiD-UK compared with TAU. Method We designed WP3 as an internal pilot trial with the intention of progressing to WP4, the full RCT, if it met predefined success criteria. The study design was a multicentre, two-arm, parallel-group, single-blind individually randomised pragmatic trial with an internal pilot. We allocated pairs at random between COTiD-UK and TAU, which may or may not include standard occupational therapy. The primary outcome was the Bristol Activities of Daily Living Scale (BADLS) score at 26 weeks. Secondary outcome measures were as follows: •for person with dementia – cognition (Mini Mental State Examination), ADL performance (Interview of Deterioration in Daily activities of Dementia), quality of life [Dementia Quality of Life (DEMQOL) scale] and mood (Cornell Scale for Depression in Dementia) •for the family carer – sense of competence (Sense of Competence Questionnaire), quality of life (DEMQOL scale) and mood (Hospital Anxiety and Depressions Scale) •for all participants – social contacts, leisure activities and serious adverse events. These outcomes were selected to reflect those measured in the previous trials of COTiD. We undertook a cost–utility analysis of the COTiD-UK intervention relative to TAU using costs and outcome data from the trial. Our analysis adopted the perspective of the NHS and Personal Social Services, as well as a societal perspective. The time horizon was 26 weeks, reflecting the trial’s primary end point. We assessed the effectiveness of the intervention in quality-adjusted life-years (QALYs) estimated from mortality and health-related quality-of-life data collected using the DEMQOL scale for carers, DEMQOL-Proxy for people with dementia and EuroQol-5 Dimensions, five-level version, and health and social care services used for both. We embedded two qualitative studies within the trial: •We explored the experience of undertaking the COTiD-UK intervention from the perspective of people with dementia, family carers and occupational therapists. We conducted semistructured interviews over the telephone with occupational therapists and face to face with pairs. We audio recorded and transcribed all interviews, checked them for accuracy, anonymised them and used inductive thematic analysis. •We explored why pairs declined to take part in the trial. We interviewed a convenience sample of carers identified during the screening process as being eligible but who subsequently declined to take part. We approached them only if we judged that it was unlikely to cause distress. We audio recorded and transcribed the telephone interviews, checked them for accuracy, anonymised them and used inductive thematic analysis. Results The independent Programme Steering Committee reviewed the internal pilot trial and agreed that we should carry the data collected to date forward to the main trial data set. We recruited 15 NHS trusts; however, one trust did not proceed to recruiting pairs owing to unforeseen service reorganisation that resulted in the occupational therapists whom we had trained no longer being available to take part. We trained 44 occupational therapists to deliver COTiD-UK, of whom 32 proceeded to the RCT and were allocated at least one pair each, although one was subsequently unavailable to provide the intervention as planned owing to ill health. We randomised 468 pairs: 249 to COTiD-UK and 219 to TAU. As we expected, the demographic and clinical characteristics of both groups were very similar at baseline. People with dementia ranged in age from 55 to 97 years, with a mean age of 78.6 years, and family carers ranged in age from 29 to 94 years, with a mean age of 69.1 years. The majority of people with dementia (74.8%) were married; 19.2% lived alone. Most family carers (72.6%) were spouses but 22.2% were adult children. At 26 weeks, 406 (87%) pairs remained in the trial. We collected and analysed outcome data from 368 (79%) pairs: 207 (83%) allocated to COTiD-UK and 161 (74%) allocated to TAU. At 26 weeks, there was no evidence to suggest a difference between the COTiD-UK and TAU groups in the primary outcome (BADLS score) or in any secondary outcome. Further analysis of BADLS scores and secondary outcomes at 52 and 78 weeks also showed no difference between the COTiD-UK and TAU groups. The non-adherence rate was 4.64%, compared with the target of 5%. The number of goals set per pair ranged from one to thirteen, with a mean of 4.09 goals. The total number of goals set was 920, of which 729 (79.24%) were achieved, 107 (11.63%) were partially achieved and 84 (9.13%) were not achieved. A total of 239 serious adverse events were recorded over the course of the trial, but none was assessed as being related to the COTiD intervention or trial participation. If decision-makers were willing to pay £20,000 (or £30,000) for a QALY, the probability that COTiD-UK is cost-effective would be 0.02% (or 0.04%). None of these statistical or economic findings changed when we re-ran analyses without adjustment or restricted to complete cases. Qualitative study 1 We interviewed seven occupational therapists and 22 pairs. We identified six themes from the occupational therapist interviews: (1) valuing the occupational focus of COTiD-UK, (2) timing and relationships, (3) achieving goals, (4) developing COTiD-UK knowledge and skills, (5) delivering COTiD-UK within current organisational models, and (6) delivering COTiD-UK in the future. We identified four themes from the interviews with people with dementia and their family carers: (1) achieving goals, (2) working together, (3) effect of dementia and (4) COTiD-UK outcomes. Qualitative study 2 We interviewed 10 family carers and identified two themes: (1) protectiveness and (2) ‘It’s not for us’. Conclusion This trial recruited 97.5% of the target sample, and attrition and non-adherence rates were low. Sites had fewer available occupational therapists than expected, and drop-out rates were higher than expected; therefore, we recruited more sites than originally planned, which took longer than expected. Our design required sites to access researchers, often from the local Clinical Research Network, to recruit participants and collect data, and occupational therapists to deliver the COTiD-UK intervention. Only 2 of the 15 trial sites acquired ‘excess treatment costs’, namely the additional funding that is required within the UK to deliver the clinical intervention being evaluated, as the research grant funding does not cover this. This inevitably reduced capacity to deliver the intervention in some sites because the occupational therapists’ availability was dependent on the goodwill of their managers, who had to balance their support for the study with the need to continue providing the usual service being commissioned. Hence, recruitment rates varied across sites, with some sites exceeding their recruitment target and more not achieving it. The trial statistical results showed no evidence that COTiD-UK was better than the usual care being provided, nor did the economic evaluation provide support for COTiD-UK. By contrast, many people with dementia and family carers described the intervention and its impact in very positive terms, providing examples of how they had resumed old activities and felt empowered to continue participation in future. Implementation phase (work package 5) This phase was amended in response to the cumulative delays outlined above, and the number of data already collected, taking into account the lack of statistically significant results and the growing body of implementation science knowledge. Aim The aims of this WP were to assess the intervention fidelity and to explore why the intervention was, or was not, delivered as planned. Methods We used a longitudinal observational design nested within the trial to assess fidelity to the COTiD-UK intervention. We audio-recorded as many COTiD-UK sessions as was feasible. We developed, piloted and refined fidelity checklists and coding until we achieved good agreement between coders. We purposively sampled 10% of sessions, and estimated percentages of components delivered for each session, occupational therapist and site. We reviewed data collected during the earlier development, piloting and evaluation phases using the theoretical domains framework to identify factors that enabled or hindered intervention delivery. Results A reliable measure of intervention fidelity was developed. Application of this measure found that COTiD-UK was delivered with moderate fidelity overall, although the mean range varied across sites and occupational therapists. The key domains affecting COTiD-UK implementation in practice were knowledge, skills (capability), environmental context and resources (opportunity) and beliefs about capabilities (motivation). Recommendations for future research Traditionally, psychosocial intervention research has focused on assessing outcomes such as cognition, daily living abilities and quality of life as core domains potentially impacted by dementia, using measures of deterioration and impairment. We noted that, in the main, pairs set goals relating to a wider range of activities than those covered within the BADLS, for example leisure, creative, social and community based. Given that over 90% of goals set by the dyads taking part in COTiD-UK were fully or partially achieved, further analysis of the goals set and met could inform the future selection and development of more meaningful occupational outcome measures, tools and processes. It is important to develop ways of measuring the outcomes of complex interventions, such as COTiD-UK, and to measure what is meaningful and prioritised by people with dementia and their family carers. There is also a need to develop such patient-related outcome measures in formats that make them suitable for self-report, to enable data to be collected directly from people with dementia themselves, in turn meaning researchers do not have to rely on proxy data. Implications for practice The trial statistical results did not indicate any benefit of the COTiD-UK intervention as delivered in this trial compared with usual care in the outcomes measured. However, the qualitative findings provided positive examples of dyads resuming or establishing meaningful activities. There is no evidence to suggest that occupational therapy input in general does not continue to be a highly valued and important part of multiprofessional teamworking and service provision. We therefore suggest that occupational therapists do not change their practice, but continue to contribute to community teamwork and memory service provision for people with cognitive problems and their families. Conclusion This applied research programme used a rigorous and thorough process to translate and adapt the original Dutch intervention to the UK version. We found no statistical evidence for clinical effectiveness or cost-effectiveness of COTiD-UK compared with the usual care provided. By contrast, people with dementia, family carers and occupational therapists provided positive examples of meaningful activities being resumed or established. We have shown that it is possible to conduct and effectively deliver a well-designed, high-quality, highly complex clinical trial of occupational therapy across 15 sites and requiring intervention delivery by experienced occupational therapists. Trial registration This trial was registered as ISRCTN10748953 (WP3 and WP4). Funding This project was funded by the National Institute for Health and Care Research (NIHR) Programme Grants for Applied Research programme and will be published in full in Programme Grants for Applied Research; Vol. 11, No. 5. See the NIHR Journals Library website for further project information.

OBJECTIVE: Previous studies on effects of emotional demands on depression have relied on self-reported exposure data and lacked control for potential confounding by pre-employment risk factors for depression. This study used a register-based design to examine the risk of hospital-treated depressive disorder in relation to occupational levels of emotional demands at work, furthermore addressing the role of risk factors for depression before workforce entry. METHODS: We analyzed data from two Danish register-based cohorts – Job Exposure Matrix Analyses of Psychosocial Factors and Healthy Ageing in Denmark (JEMPAD, N= 1 665 798) (17) and Danish Work Life Course Cohort (DaWCo, N=939 411), which link assessments of emotional demands by job exposure matrices to records of hospital-treated depressive disorder among employees aged 15–59 years at baseline (average follow up: 9.7 years in JEMPAD, 7.3 years in DaWCo). Potential confounders comprised sociodemographics, job control, work-related violence and physical demands at work. In DaWCo, we followed individuals from their entry into the workforce, and also included data on risk factors for depression before workforce entry (eg, parental income, education, and psychiatric diagnoses). RESULTS: Employees in occupations with high emotional demands had an increased risk of hospital-treated depressive disorder with confounder-adjusted hazard ratios of 1.32 [95% confidence interval (CI) 1.24‒1.41] and 1.19 (95% CI 1.09‒1.30) in JEMPAD and DaWCO, respectively. This association remained after controlling for risk factors before workforce entry. CONCLUSIONS: This study suggests that employees in occupations with high emotional demands are at increased risk of hospital-treated depressive disorder. This increased risk was neither attributable to reporting bias nor explained by the included risk factors for depression recorded before workforce entry.

Bacterial cell wall enzymes and their precursors are critical targets for antibiotic development. Here, the authors investigate several biosynthetic enzymes with their substrates and show that the passage of substrates and products in the pathway is controlled by their relative binding affinities.

This paper explores the complexities of conviviality in a London neighbourhood by using primary qualitative data to analyse the implications of the (in)visibility of difference for superdiverse social relations. It develops the concept of power‐geometries to examine the implications of how social differences are produced, imagined, and experienced in the neighbourhood's public spaces. Drawing on three situated examples from a visual ethnographic research project, it explores the affective intensities of how gender, sexuality, class, and race intersect with ethnicity, religion, and migrant status to shape urban conviviality. The paper argues the way different positions and identities are layered and intersect can shape the development of 'cosmopolitan outlooks' and intercultural relations. In doing so, the analysis refines understandings of superdiversity conceived narrowly within the remit of majority/minority relations. It promotes instead more critically ethnographic explorations of the complex and varied ways difference has meaning in everyday lives in superdiverse places and shapes everyday forms of recognition and equality. The paper contributes to debates on geographies of difference, encounter, and public space by analysing how power relations affect conviviality. It demonstrates how conviviality is an ambivalent process that is punctuated by both prejudices and solidarities and is shaped by structural inequalities and wider political discourses. The paper concludes by highlighting the role of agency and space for dialogue for residents negotiating differences among urban change. [ABSTRACT FROM AUTHOR]

Abstract Background Antipsychotic medication can reduce psychotic symptoms and risk of relapse in people with schizophrenia and related disorders, but it is not always effective and adverse effects can be significant. We know little of patients’ views about continuing or discontinuing antipsychotic treatment. Aims To explore the views of people with schizophrenia and other psychotic disorders about continuing their antipsychotic medication or attempting to reduce or discontinue this medication with clinical support. Methods We collected quantitative and qualitative data by conducting semi-structured interviews in London, UK. Factors predicting a desire to discontinue medication were explored. Content analysis of qualitative data was undertaken. Results We interviewed 269 participants. 33% (95% CI, 27 to 39%) were content with taking long-term antipsychotic medication. Others reported they took it reluctantly (19%), accepted it on a temporary basis (24%) or actively disliked it (18%). 31% (95% CI, 25 to 37%) said they would like to try to stop medication with professional support, and 45% (95% CI, 39 to 51%) wanted the opportunity to reduce medication. People who wanted to discontinue had more negative attitudes towards the medication but were otherwise similar to other participants. Wanting to stop or reduce medication was motivated mainly by adverse effects and health concerns. Professional support was identified as potentially helpful to achieve reduction. Conclusions This large study reveals that patients are commonly unhappy about the idea of taking antipsychotics on a continuing or life-long basis. Professional support for people who want to try to reduce or stop medication is valued.

Background: Breast cancer incidence increases with age and real-world data is essential to guide prescribing practices in the older population. The aim of this study was to collect large scale real-world data on tolerability and efficacy of palbociclib + AI in the first line treatment of ER+/HER2-advanced breast cancer in those aged ≥75 years. Methods: 14 cancer centres participated in this national UK retrospective study. Patients aged ≥75 years treated with palbociclib + AI in the first line setting were identified. Data included baseline demographics, disease characteristics, toxicities, dose reductions and delays, treatment response and survival data. Multivariable Cox regression was used to assess independent predictors of PFS, OS and toxicities. Results: 276 patients met the eligibility criteria. The incidence of febrile neutropenia was low (2.2%). The clinical benefit rate was 87%. 50.7% of patients had dose reductions and 59.3% had dose delays. The 12- and 24- month PFS rates were 75.9% and 64.9%, respectively. The 12- and 24- month OS rates were 85.1% and 74.0%, respectively. Multivariable analysis identified PS, Age-adjusted Charlson Comorbidity Index (ACCI) and number of metastatic sites to be independent predictors of PFS. Dose reductions and delays were not associated with adverse survival outcomes. Baseline ACCI was an independent predictor of development and severity of neutropenia. Conclusion: Palbociclib is an effective therapy in the real-world older population and is well-tolerated with low levels of clinically significant toxicities. The use of geriatric and frailty assessments can help guide decision making in these patients.

Lipid droplet biogenesis is orchestrated by the conserved membrane protein Seipin via an unknown mechanism. Here, the authors use structural, biochemical and molecular dynamics simulation approaches to reveal the mechanism of lipid droplet formation by the yeast Seipin Sei1 and its partner Ldb16.