Modelling the Effect of Conformation on Hydrogen-Atom Abstraction from Peptides

作者：Chan Bun^*; Radom Leo^*

来源：Australian Journal of Chemistry, 2018, 71(4): 257-264.

DOI：10.1071/CH17621

Computational quantum chemistry is used to examine the effect of conformation on the kinetics of hydrogen-atom abstraction by HO center dot from amides of glycine and proline as peptide models. In accord with previous findings, it is found that there are substantial variations possible in the conformations and the corresponding energies, with the captodative effect, hydrogen bonding, and solvation being some of the major features that contribute to the variations. The ` minimum-energystructure- pathway' strategy that is often employed in theoretical studies of peptide chemistry with small models certainly provides valuable fundamental information. However, one may anticipate different reaction outcomes in structurally constrained systems due to modified reaction thermodynamics and kinetics, as demonstrated explicitly in the present study. Thus, using a ` consistent-conformation-pathway' approach may indeed be more informative in such circumstances, and in this regard theory provides information that would be difficult to obtain from experimental studies alone.

• 出版日期2018