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5. Structure/function relationship of Atlantic bonito (Sarda sardaBloch) myoglobin and comparison with Atlantic and Tinker mackerel myoglobins

Author

Ragucci, Sara, Clemente, Angela, Alberico, Laura, Campanile, Maria Giuseppina, Hussain, Hafiza Z.F., Oliver, Angela, Ruvo, Menotti, Saviano, Michele, Landi, Nicola, Woodrow, Pasqualina, and Di Maro, Antimo

Abstract

Atlantic bonito meat has economic potential as an alternative to mackerel consumption. Thus, considering the presence of myoglobin (Mb) in red fish muscles, we report the characterisation of Atlantic bonito Mb compared to Atlantic and Tinker mackerel Mbs since this haemoprotein is implicated in lipid oxidation and fish meat preservation. A plethora of biochemical approaches were employed to purified Mb from Atlantic bonito and determine the autoxidation rate constant (0.189 ± 0.009 h−1), melting temperature (Tm = 72.84 ± 1.02 °C) and pseudoperoxidase activity in different conditions (pH and several cations). Atlantic and Tinker mackerel Mbs showed a lower Tm (∼66.85 °C), while oxyMb autoxidation rate constant was higher for Atlantic mackerel (∼1.08-fold) and lower for Tinker mackerel (∼1.35-fold) compared to Atlantic bonito. This Mb had a Michaelis-Menten constant (Km) of 38.63 ± 1.89 μM, ∼2.49-fold and 2.27-fold lower than Atlantic and Tinker mackerel Mbs, respectively. Atlantic bonito Mb primary structure has 146 amino acid residues with the N-terminal acetylated and 25 amino acid substitutions with respect to Atlantic and Tinker mackerel Mbs. In silicoanalysis revealed that 7 out of 25 substitutions are close to the haem-pocket, while 18 out of 25 are far from this region. All substitutions, except H20, L70 and L81 are exposed on the protein globular surface. Overall, the results of this research provide new information for future studies that will be useful to the fish industry for preservation of frozen or canned Atlantic bonito meat considering the presence of Mb as a reactive haemoprotein.

Published
2024
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6. Prepartum Depressive Symptoms Correlate Positively with C-Reactive Protein Levels and Negatively with Tryptophan Levels: A Preliminary Report.

Author

Scrandis DA, Langenberg P, Tonelli LH, Sheikh TM, Manogura AC, Alberico LA, Hermanstyne T, Fuchs D, Mighty H, Hasday JD, Boteva K, and Postolache TT

Abstract

Prepartum and postpartum depression have negative, and sometimes devastating, effects on women and their families. As inflammatory processes are related to depression in general, we hypothesized that inflammatory perturbations, prepartum and postpartum, contribute to triggering and worsening of symptoms of peripartum depression. We conducted a longitudinal preliminary study on 27 women at high risk for developing postpartum depression measuring SIGH-SAD scores at three time points: 35-38 weeks gestation, 1-5 days postpartum, and 5-6 weeks postpartum. Serum C-reactive protein and interleukin-6, both markers of inflammation, as well as tryptophan, kynurenine, and the kynurenine/tryptophan ratio, as consequences of inflammation and pathophysiological steps towards depression, were measured at each time point. C-reactive protein levels were found to be positively related to atypical and total depression scores in the prepartum period and with atypical depression scores in the early postpartum period. Tryptophan was found to be negatively associated with total depression scores in the prepartum, as well. These findings warrant further investigation that could lead to novel interventions to decrease poor outcomes from peripartum depression.

Published
2008

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