Insights on peptide backbone N-H acidity: Structure of anions, hydration effects

Abstract : Despite the key role played by deamidation reactions in biochemical phenomena such as aging processes, knowledge of factors determining peptide backbone N-H acidities is scarce. We report a theoretical study on this topic by means of quantum-chemical calculations. Gas-phase acidities and pK(a)'s in water have been estimated. The results agree reasonably well with available experimental data. Further analysis suggests that the secondary peptide structure, in addition to hydration effects, is the main factor determining pKa. In particular, we predict N-H protons to be more acidic in beta-turns than in alpha-helices, a finding that may have broad biological implications.
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Chemical Physics Letters, Elsevier, 2013, 561, pp.153-158. 〈10.1016/j.cplett.2013.01.040〉
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https://hal.univ-lorraine.fr/hal-01494088
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Soumis le : mercredi 22 mars 2017 - 16:40:27
Dernière modification le : mardi 29 mai 2018 - 12:50:46

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Antoni Oliva, Bernard Henry, Manuel F. Ruiz-Lopez. Insights on peptide backbone N-H acidity: Structure of anions, hydration effects. Chemical Physics Letters, Elsevier, 2013, 561, pp.153-158. 〈10.1016/j.cplett.2013.01.040〉. 〈hal-01494088〉

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