Depolarizing Effects in Hydrogen Bond Energy in 3₁₀-Helices Revealed by Quantum Chemical Analysis.

ABSTRACT: Hydrogen-bond (H-bond) energies in 3₁₀-helices of short alanine peptides were systematically examined by precise DFT calculations with the negative fragmentation approach (NFA), a modified method based on the molecular tailoring approach. The contribution of each H-bond was evaluated in detail from the 3₁₀-helical conformation of total energies (whole helical model, WH_3-10 model), and the results were compared with the property of H-bond in α-helix from our previous study. The H-bond energies of the WH_3-10 model exhibited tendencies different from those exhibited by the α-helix in that they depended on the helical position of the relevant H-bond pair. H-bond pairs adjacent to the terminal H-bond pairs were observed to be strongly destabilized. Th

SUBMITTER: Kondo HX 

PROVIDER: S-EPMC9409261 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature