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1. Loss of function of FAM177A1, a Golgi complex localized protein, causes a novel neurodevelopmental disorder

Author

Acosta, Maria T., Adam, Margaret, Adams, David R., Alvarez, Raquel L., Alvey, Justin, Amendola, Laura, Andrews, Ashley, Ashley, Euan A., Bacino, Carlos A., Bademci, Guney, Balasubramanyam, Ashok, Baldridge, Dustin, Bale, Jim, Bamshad, Michael, Barbouth, Deborah, Bayrak-Toydemir, Pinar, Beck, Anita, Beggs, Alan H., Behrens, Edward, Bejerano, Gill, Bellen, Hugo J., Bennett, Jimmy, Berg-Rood, Beverly, Bernstein, Jonathan A., Berry, Gerard T., Bican, Anna, Bivona, Stephanie, Blue, Elizabeth, Bohnsack, John, Bonner, Devon, Botto, Lorenzo, Boyd, Brenna, Briere, Lauren C., Burke, Elizabeth A., Burrage, Lindsay C., Butte, Manish J., Byers, Peter, Byrd, William E., Carey, John, Carrasquillo, Olveen, Cassini, Thomas, Chang, Ta Chen Peter, Chanprasert, Sirisak, Chao, Hsiao-Tuan, Chinn, Ivan, Clark, Gary D., Coakley, Terra R., Cobban, Laurel A., Cogan, Joy D., Coggins, Matthew, Sessions Cole, F., Colley, Heather A., Cope, Heidi, Corner, Brian, Corona, Rosario, Craigen, William J., Crouse, Andrew B., Cunningham, Michael, D’Souza, Precilla, Dai, Hongzheng, Dasari, Surendra, Davis, Joie, Dayal, Jyoti G., Dell’Angelica, Esteban C., Dickson, Patricia, Dipple, Katrina, Doherty, Daniel, Dorrani, Naghmeh, Doss, Argenia L., Douine, Emilie D., Earl, Dawn, Eckstein, David J., Emrick, Lisa T., Eng, Christine M., Ezell, Kimberly, Falk, Marni, Fieg, Elizabeth L., Fisher, Paul G., Fogel, Brent L., Forghani, Irman, Gahl, William A., Glass, Ian, Gochuico, Bernadette, Goddard, Page C., Godfrey, Rena A., Golden-Grant, Katie, Grajewski, Alana, Hadley, Don, Hahn, Sihoun, Halley, Meghan C., Hamid, Rizwan, Hassey, Kelly, Hayes, Nichole, High, Frances, Hing, Anne, Hisama, Fuki M., Holm, Ingrid A., Hom, Jason, Horike-Pyne, Martha, Huang, Alden, Hutchison, Sarah, Introne, Wendy, Isasi, Rosario, Izumi, Kosuke, Jamal, Fariha, Jarvik, Gail P., Jarvik, Jeffrey, Jayadev, Suman, Jean-Marie, Orpa, Jobanputra, Vaidehi, Karaviti, Lefkothea, Ketkar, Shamika, Kiley, Dana, Kilich, Gonench, Kobren, Shilpa N., Kohane, Isaac S., Kohler, Jennefer N., Korrick, Susan, Kozuira, Mary, Krakow, Deborah, Krasnewich, Donna M., Kravets, Elijah, Lalani, Seema R., Lam, Byron, Lam, Christina, Lanpher, Brendan C., Lanza, Ian R., LeBlanc, Kimberly, Lee, Brendan H., Levitt, Roy, Lewis, Richard A., Liu, Pengfei, Liu, Xue Zhong, Longo, Nicola, Loo, Sandra K., Loscalzo, Joseph, Maas, Richard L., Macnamara, Ellen F., MacRae, Calum A., Maduro, Valerie V., Maghiro, AudreyStephannie, Mahoney, Rachel, Malicdan, May Christine V., Mamounas, Laura A., Manolio, Teri A., Mao, Rong, Maravilla, Kenneth, Marom, Ronit, Marth, Gabor, Martin, Beth A., Martin, Martin G., Martínez-Agosto, Julian A., Marwaha, Shruti, McCauley, Jacob, McConkie-Rosell, Allyn, McCray, Alexa T., McGee, Elisabeth, Mefford, Heather, Lawrence Merritt, J., Might, Matthew, Mirzaa, Ghayda, Morava, Eva, Moretti, Paolo, Mulvihill, John, Nakano-Okuno, Mariko, Nelson, Stanley F., Neumann, Serena, Newman, John H., Nicholas, Sarah K., Nickerson, Deborah, Nieves-Rodriguez, Shirley, Novacic, Donna, Oglesbee, Devin, Orengo, James P., Pace, Laura, Pak, Stephen, Carl Pallais, J., Palmer, Christina G.S., Papp, Jeanette C., Parker, Neil H., Phillips, John A., III, Posey, Jennifer E., Potocki, Lorraine, Pusey Swerdzewski, Barbara N., Quinlan, Aaron, Rao, Deepak A., Raper, Anna, Raskind, Wendy, Renteria, Genecee, Reuter, Chloe M., Rives, Lynette, Robertson, Amy K., Rodan, Lance H., Rosenfeld, Jill A., Rosenwasser, Natalie, Rossignol, Francis, Ruzhnikov, Maura, Sacco, Ralph, Sampson, Jacinda B., Saporta, Mario, Schaechter, Judy, Schedl, Timothy, Schoch, Kelly, Scott, Daryl A., Ron Scott, C., Seto, Elaine, Shashi, Vandana, Shin, Jimann, Silverman, Edwin K., Sinsheimer, Janet S., Sisco, Kathy, Smith, Edward C., Smith, Kevin S., Solnica-Krezel, Lilianna, Solomon, Ben, Spillmann, Rebecca C., Stoler, Joan M., Sullivan, Kathleen, Sullivan, Jennifer A., Sun, Angela, Sutton, Shirley, Sweetser, David A., Sybert, Virginia, Tabor, Holly K., Tan, Queenie K.-G., Tan, Amelia L.M., Tarakad, Arjun, Tekin, Mustafa, Telischi, Fred, Thorson, Willa, Tifft, Cynthia J., Toro, Camilo, Tran, Alyssa A., Ungar, Rachel A., Urv, Tiina K., Vanderver, Adeline, Velinder, Matt, Viskochil, Dave, Vogel, Tiphanie P., Wahl, Colleen E., Walker, Melissa, Wallace, Stephanie, Walley, Nicole M., Wambach, Jennifer, Wan, Jijun, Wangler, Michael F., Ward, Patricia A., Wegner, Daniel, Hubshman, Monika Weisz, Wener, Mark, Wenger, Tara, Westerfield, Monte, Wheeler, Matthew T., Whitlock, Jordan, Wolfe, Lynne A., Worley, Kim, Xiao, Changrui, Yamamoto, Shinya, Yang, John, Zhang, Zhe, Zuchner, Stephan, Legro, Nicole R., Bowman, Angela, Ugur, Berrak, Jackstadt, Madelyn M., Shriver, Leah P., Patti, Gary J., Zhang, Bo, Feng, Wenjia, McAdow, Anthony R., Goddard, Pagé, Jensen, Tanner, Fresard, Laure, Alvarez, Raquel, McCormack, Colleen, Holt, James M., Worthey, Elizabeth A., Montgomery, Stephen B., Postlethwait, John, De Camilli, Pietro, and Solnica-Krezel, Lila

Published
2024
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4. Biallelic PI4KA variants cause neurological, intestinal and immunological disease

Author

Salter, Claire G, Cai, Yiying, Lo, Bernice, Helman, Guy, Taylor, Henry, McCartney, Amber, Leslie, Joseph S, Accogoli, Andrea, Zara, Frederico, Traverso, Monica, Fasham, James, Lees, Joshua A, Ferla, Matteo, Chioza, Barry A, Wenger, Olivia, Scott, Ethan, Cross, Harold E, Crawford, Joanna, Warshawsky, Ilka, Keisling, Matthew, Agamanolis, Dimitris, Melver, Catherine Ward, Cox, Helen, Elawad, Mamoun, Marton, Tamas, Wakeling, Matthew, Holzinger, Dirk, Tippelt, Stephan, Munteanu, Martin, Valcheva, Deyana, Deal, Christin, Van Meerbeke, Sara, Vockley, Catherine Walsh, Butte, Manish J, Acar, Utkucan, van der Knaap, Marjo S, Korenke, G Christoph, Kotzaeridou, Urania, Balla, Tamas, Simons, Cas, Uhlig, Holm H, Crosby, Andrew H, De Camilli, Pietro, Wolf, Nicole I, and Baple, Emma L

Subjects
Digestive Diseases, Pediatric, 1.1 Normal biological development and functioning, Aetiology, 2.1 Biological and endogenous factors, Underpinning research, Oral and gastrointestinal, Female, Hereditary Central Nervous System Demyelinating Diseases, Humans, Intestinal Atresia, Male, Minor Histocompatibility Antigens, Pedigree, Phosphotransferases (Alcohol Group Acceptor), Polymorphism, Single Nucleotide, Primary Immunodeficiency Diseases, hypomyelinating leukodystrophy, multiple intestinal atresia, PI4KA, FAM126A, TTC7A, PI4KA, Medical and Health Sciences, Psychology and Cognitive Sciences, Neurology & Neurosurgery
Abstract

Phosphatidylinositol 4-kinase IIIα (PI4KIIIα/PI4KA/OMIM:600286) is a lipid kinase generating phosphatidylinositol 4-phosphate (PI4P), a membrane phospholipid with critical roles in the physiology of multiple cell types. PI4KIIIα's role in PI4P generation requires its assembly into a heterotetrameric complex with EFR3, TTC7 and FAM126. Sequence alterations in two of these molecular partners, TTC7 (encoded by TTC7A or TCC7B) and FAM126, have been associated with a heterogeneous group of either neurological (FAM126A) or intestinal and immunological (TTC7A) conditions. Here we show that biallelic PI4KA sequence alterations in humans are associated with neurological disease, in particular hypomyelinating leukodystrophy. In addition, affected individuals may present with inflammatory bowel disease, multiple intestinal atresia and combined immunodeficiency. Our cellular, biochemical and structural modelling studies indicate that PI4KA-associated phenotypical outcomes probably stem from impairment of PI4KIIIα-TTC7-FAM126's organ-specific functions, due to defective catalytic activity or altered intra-complex functional interactions. Together, these data define PI4KA gene alteration as a cause of a variable phenotypical spectrum and provide fundamental new insight into the combinatorial biology of the PI4KIIIα-FAM126-TTC7-EFR3 molecular complex.

Published
2021

7. Optimized Vivid-derived Magnets photodimerizers for subcellular optogenetics in mammalian cells

Author

Benedetti, Lorena, Marvin, Jonathan S, Falahati, Hanieh, Guillén-Samander, Andres, Looger, Loren L, and De Camilli, Pietro

Subjects
Biochemistry and Cell Biology, Biological Sciences, Generic health relevance, Animals, Biological Transport, COS Cells, Chlorocebus aethiops, Dimerization, Fungal Proteins, HeLa Cells, Humans, Kinetics, Light, Lipid Metabolism, Mice, Inbred C57BL, Optogenetics, Organelles, Phosphatidylinositol Phosphates, Protein Engineering, Protein Multimerization, Protein Stability, Protein Transport, Hela Cells, LOV domain, VAP, Vivid, cell biology, contact sites, human, light-dependent dimerizers, organelle contacts, Biological sciences, Biomedical and clinical sciences, Health sciences
Abstract

Light-inducible dimerization protein modules enable precise temporal and spatial control of biological processes in non-invasive fashion. Among them, Magnets are small modules engineered from the Neurospora crassa photoreceptor Vivid by orthogonalizing the homodimerization interface into complementary heterodimers. Both Magnets components, which are well-tolerated as protein fusion partners, are photoreceptors requiring simultaneous photoactivation to interact, enabling high spatiotemporal confinement of dimerization with a single excitation wavelength. However, Magnets require concatemerization for efficient responses and cell preincubation at 28°C to be functional. Here we overcome these limitations by engineering an optimized Magnets pair requiring neither concatemerization nor low temperature preincubation. We validated these 'enhanced' Magnets (eMags) by using them to rapidly and reversibly recruit proteins to subcellular organelles, to induce organelle contacts, and to reconstitute OSBP-VAP ER-Golgi tethering implicated in phosphatidylinositol-4-phosphate transport and metabolism. eMags represent a very effective tool to optogenetically manipulate physiological processes over whole cells or in small subcellular volumes.

Published
2020

8. Lysosome damage triggers acute formation of ER to lysosomes membrane tethers mediated by the bridge-like lipid transport protein VPS13C

Author

Wang, Xinbo, primary, Xu, Peng, additional, Bentley-DeSousa, Amanda, additional, Hancock-Cerutti, William, additional, Cai, Shujun, additional, Johnson, Benjamin T, additional, Tonelli, Francesca, additional, Talaia, Gabriel, additional, Alessi, Dario R, additional, Ferguson, Shawn M, additional, and De Camilli, Pietro, additional

Published
2024
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13. Structural inhibition of dynamin-mediated membrane fission by endophilin.

Author

Hohendahl, Annika, Talledge, Nathaniel, Galli, Valentina, Shen, Peter S, Humbert, Frédéric, De Camilli, Pietro, Frost, Adam, and Roux, Aurélien

Subjects
Membranes, Animals, Humans, Rats, Dynamin I, Acyltransferases, Microscopy, Electron, Endocytosis, Protein Conformation, BAR domain, biophysics, cell biology, dynamin, endocytosis, endophilin, membrane fission, none, structural biology, Microscopy, Electron, Biochemistry and Cell Biology
Abstract

Dynamin, which mediates membrane fission during endocytosis, binds endophilin and other members of the Bin-Amphiphysin-Rvs (BAR) protein family. How endophilin influences endocytic membrane fission is still unclear. Here, we show that dynamin-mediated membrane fission is potently inhibited in vitro when an excess of endophilin co-assembles with dynamin around membrane tubules. We further show by electron microscopy that endophilin intercalates between turns of the dynamin helix and impairs fission by preventing trans interactions between dynamin rungs that are thought to play critical roles in membrane constriction. In living cells, overexpression of endophilin delayed both fission and transferrin uptake. Together, our observations suggest that while endophilin helps shape endocytic tubules and recruit dynamin to endocytic sites, it can also block membrane fission when present in excess by inhibiting inter-dynamin interactions. The sequence of recruitment and the relative stoichiometry of the two proteins may be critical to regulated endocytic fission.

Published
2017

14. Parkinson Sac Domain Mutation in Synaptojanin 1 Impairs Clathrin Uncoating at Synapses and Triggers Dystrophic Changes in Dopaminergic Axons

Author

Cao, Mian, Wu, Yumei, Ashrafi, Ghazaleh, McCartney, Amber J, Wheeler, Heather, Bushong, Eric A, Boassa, Daniela, Ellisman, Mark H, Ryan, Timothy A, and De Camilli, Pietro

Subjects
Biological Psychology, Biomedical and Clinical Sciences, Neurosciences, Psychology, Parkinson's Disease, Brain Disorders, Aging, Neurodegenerative, Aetiology, 2.1 Biological and endogenous factors, Neurological, Animals, Axons, Clathrin, Dopamine, Endocytosis, Humans, Mice, Transgenic, Mutation, Parkinson Disease, Parkinsonian Disorders, Phosphoric Monoester Hydrolases, Synapses, LRRK2, PARK19, PARK2, PARK20, PI(4, 5)P2, Parkin, auxilin, neurodegeneration, nigrostriatal pathway, synaptic vesicle endocytosis, synaptojanin 1, Cognitive Sciences, Neurology & Neurosurgery, Biological psychology
Abstract

Synaptojanin 1 (SJ1) is a major presynaptic phosphatase that couples synaptic vesicle endocytosis to the dephosphorylation of PI(4,5)P2, a reaction needed for the shedding of endocytic factors from their membranes. While the role of SJ1's 5-phosphatase module in this process is well recognized, the contribution of its Sac phosphatase domain, whose preferred substrate is PI4P, remains unclear. Recently a homozygous mutation in its Sac domain was identified in early-onset parkinsonism patients. We show that mice carrying this mutation developed neurological manifestations similar to those of human patients. Synapses of these mice displayed endocytic defects and a striking accumulation of clathrin-coated intermediates, strongly implicating Sac domain's activity in endocytic protein dynamics. Mutant brains had elevated auxilin (PARK19) and parkin (PARK2) levels. Moreover, dystrophic axonal terminal changes were selectively observed in dopaminergic axons in the dorsal striatum. These results strengthen evidence for a link between synaptic endocytic dysfunction and Parkinson's disease.

Published
2017

15. Overlapping role of synaptophysin and synaptogyrin family proteins in determining the small size of synaptic vesicles.

Author

Park, Daehun, Fujise, Kenshiro, Yumei Wu, Luján, Rafael, Del Olmo-Cabrera, Sergio, Wesseling, John F., and De Camilli, Pietro

Subjects
SYNAPTIC vesicles, TRANSMEMBRANE domains, MEMBRANE proteins, SYNAPTOPHYSIN, FIBROBLASTS
Abstract

Members of the synaptophysin and synaptogyrin family are vesicle proteins with four transmembrane domains. In spite of their abundance in synaptic vesicle (SV) membranes, their role remains elusive and only mild defects at the cellular and organismal level are observed in mice lacking one or more family members. Here, we show that coexpression with synapsin in fibroblasts of each of the four brain-enriched members of this family--synaptophysin, synaptoporin, synaptogyrin 1, and synaptogyrin 3--is sufficient to generate clusters of small vesicles in the same size range of SVs. Moreover, mice lacking all these four proteins have larger SVs. We conclude that synaptophysin and synaptogyrin family proteins play an overlapping function in the biogenesis of SVs and in determining their small size. [ABSTRACT FROM AUTHOR]

Published
2024
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24. Rare deleterious mutations of the gene EFR3A in autism spectrum disorders.

Author

Gupta, Abha, Pirruccello, Michelle, Cheng, Feng, Kang, Hyo, Fernandez, Thomas, Baskin, Jeremy, Choi, Murim, Liu, Li, Ercan-Sencicek, Adife, Murdoch, John, Klei, Lambertus, Neale, Benjamin, Franjic, Daniel, Daly, Mark, Lifton, Richard, De Camilli, Pietro, Zhao, Hongyu, Sestan, Nenad, and State, Matthew

Subjects
Autism spectrum disorder, EFR3A, Genetics, Phosphoinositide metabolism, Rare variants, Synapse
Abstract

BACKGROUND: Whole-exome sequencing studies in autism spectrum disorder (ASD) have identified de novo mutations in novel candidate genes, including the synaptic gene Eighty-five Requiring 3A (EFR3A). EFR3A is a critical component of a protein complex required for the synthesis of the phosphoinositide PtdIns4P, which has a variety of functions at the neural synapse. We hypothesized that deleterious mutations in EFR3A would be significantly associated with ASD. METHODS: We conducted a large case/control association study by deep resequencing and analysis of whole-exome data for coding and splice site variants in EFR3A. We determined the potential impact of these variants on protein structure and function by a variety of conservation measures and analysis of the Saccharomyces cerevisiae Efr3 crystal structure. We also analyzed the expression pattern of EFR3A in human brain tissue. RESULTS: Rare nonsynonymous mutations in EFR3A were more common among cases (16 / 2,196 = 0.73%) than matched controls (12 / 3,389 = 0.35%) and were statistically more common at conserved nucleotides based on an experiment-wide significance threshold (P = 0.0077, permutation test). Crystal structure analysis revealed that mutations likely to be deleterious were also statistically more common in cases than controls (P = 0.017, Fisher exact test). Furthermore, EFR3A is expressed in cortical neurons, including pyramidal neurons, during human fetal brain development in a pattern consistent with ASD-related genes, and it is strongly co-expressed (P

Published
2014

25. Parkinsonism Sac domain mutation in Synaptojanin-1 affects ciliary properties in iPSC-derived dopaminergic neurons.

Author

Rafiq, Nisha Mohd, Fujise, Kenshiro, Rosenfeld, Martin Shaun, Peng Xu, and De Camilli, Pietro

Subjects
DOPAMINERGIC neurons, PARKINSONIAN disorders, NERVE endings, PARKINSON'S disease
Abstract

Synaptojanin-1 (SJ1) is a major neuronal-enriched PI(4, 5)P2 4-and 5-phosphatase implicated in the shedding of endocytic factors during endocytosis. A mutation (R258Q) that impairs selectively its 4-phosphatase activity causes Parkinsonism in humans and neurological defects in mice (SJ1RQKI mice). Studies of these mice showed, besides an abnormal assembly state of endocytic factors at synapses, the presence of dystrophic nerve terminals selectively in a subset of nigro-striatal dopamine (DA)-ergic axons, suggesting a special lability of DA neurons to the impairment of SJ1 function. Here we have further investigated the impact of SJ1 on DA neurons using iPSC-derived SJ1 KO and SJ1RQKI DA neurons and their isogenic controls. In addition to the expected enhanced clustering of endocytic factors in nerve terminals, we observed in both SJ1 mutant neuronal lines increased cilia length. Further analysis of cilia of SJ1RQDA neurons revealed abnormal accumulation of the Ca2+ channel Cav1.3 and of ubiquitin chains, suggesting a defect in the clearing of ubiquitinated proteins at the ciliary base, where a focal concentration of SJ1 was observed. We suggest that SJ1 may contribute to the control of ciliary protein dynamics in DA neurons, with implications on cilia-mediated signaling. [ABSTRACT FROM AUTHOR]

Published
2024
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33. Architecture of the human PI4KIIIα lipid kinase complex

Author

Lees, Joshua A., Zhang, Yixiao, Oh, Michael S., Schauder, Curtis M., Yu, Xiaoling, Baskin, Jeremy M., Dobbs, Kerry, Notarangelo, Luigi D., De Camilli, Pietro, Walz, Thomas, and Reinisch, Karin M.

Published
2017

35. PtdIns4P synthesis by PI4KIIIα at the plasma membrane and its impact on plasma membrane identity

Author

Nakatsu, Fubito, Baskin, Jeremy M, Chung, Jeeyun, Tanner, Lukas B, Shui, Guanghou, Lee, Sang Yoon, Pirruccello, Michelle, Hao, Mingming, Ingolia, Nicholas T, Wenk, Markus R, and De Camilli, Pietro

Subjects
Biochemistry and Cell Biology, Biological Sciences, Underpinning research, 1.1 Normal biological development and functioning, Generic health relevance, Animals, Cell Membrane, Electroporation, Female, Fibroblasts, Genetic Vectors, HeLa Cells, Humans, Male, Mice, Mice, 129 Strain, Mice, Inbred C57BL, Mice, Knockout, Minor Histocompatibility Antigens, Phosphatidylinositol Phosphates, Phosphotransferases (Alcohol Group Acceptor), Up-Regulation, Hela Cells, Medical and Health Sciences, Developmental Biology, Biological sciences, Biomedical and clinical sciences
Abstract

Plasma membrane phosphatidylinositol (PI) 4-phosphate (PtdIns4P) has critical functions via both direct interactions and metabolic conversion to PI 4,5-bisphosphate (PtdIns(4,5)P₂) and other downstream metabolites. However, mechanisms that control this PtdIns4P pool in cells of higher eukaryotes remain elusive. PI4KIIIα, the enzyme thought to synthesize this PtdIns4P pool, is reported to localize in the ER, contrary to the plasma membrane localization of its yeast homologue, Stt4. In this paper, we show that PI4KIIIα was targeted to the plasma membrane as part of an evolutionarily conserved complex containing Efr3/rolling blackout, which we found was a palmitoylated peripheral membrane protein. PI4KIIIα knockout cells exhibited a profound reduction of plasma membrane PtdIns4P but surprisingly only a modest reduction of PtdIns(4,5)P₂ because of robust up-regulation of PtdIns4P 5-kinases. In these cells, however, much of the PtdIns(4,5)P₂ was localized intracellularly, rather than at the plasma membrane as in control cells, along with proteins typically restricted to this membrane, revealing a major contribution of PI4KIIIα to the definition of plasma membrane identity.

Published
2012

44. The inositol 5-phosphatase SHIP2 regulates endocytic clathrin-coated pit dynamics.

Author

Nakatsu, Fubito, Perera, Rushika, Lucast, Louise, Zoncu, Roberto, Domin, Jan, Gertler, Frank, Toomre, Derek, and De Camilli, Pietro

Subjects
Animals, COS Cells, Chlorocebus aethiops, Clathrin, Coated Pits, Cell-Membrane, Endocytosis, Inositol Polyphosphate 5-Phosphatases, Mice, Phosphatidylinositol-3, 4, 5-Trisphosphate 5-Phosphatases, Phosphoric Monoester Hydrolases
Abstract

Phosphatidylinositol (PI) 4,5-bisphosphate (PI(4,5)P(2)) and its phosphorylated product PI 3,4,5-triphosphate (PI(3,4,5)P(3)) are two major phosphoinositides concentrated at the plasma membrane. Their levels, which are tightly controlled by kinases, phospholipases, and phosphatases, regulate a variety of cellular functions, including clathrin-mediated endocytosis and receptor signaling. In this study, we show that the inositol 5-phosphatase SHIP2, a negative regulator of PI(3,4,5)P(3)-dependent signaling, also negatively regulates PI(4,5)P(2) levels and is concentrated at endocytic clathrin-coated pits (CCPs) via interactions with the scaffold protein intersectin. SHIP2 is recruited early at the pits and dissociates before fission. Both knockdown of SHIP2 expression and acute production of PI(3,4,5)P(3) shorten CCP lifetime by enhancing the rate of pit maturation, which is consistent with a positive role of both SHIP2 substrates, PI(4,5)P(2) and PI(3,4,5)P(3), on coat assembly. Because SHIP2 is a negative regulator of insulin signaling, our findings suggest the importance of the phosphoinositide metabolism at CCPs in the regulation of insulin signal output.

Published
2010

46. A Role for Talin in Presynaptic Function

Author

Morgan, Jennifer R., Di Paolo, Gilbert, Werner, Hauke, Shchedrina, Valentina A., Pypaert, Marc, Pieribone, Vincent A., and De Camilli, Pietro

Published
2004

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