期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：1982
卷号：79
期号：22
页码：7047-7051
DOI：10.1073/pnas.79.22.7047
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：The energies of three- and five-chain antiparallel and parallel beta-sheets were minimized. Each chain consisted of six L-valine residues with CH3CO and NHCH3 end groups; the chains were considered to be equivalent, but all dihedral angles of a given chain were allowed to vary independently during energy minimization. The minimum-energy structures had a considerable right-handed twist, as observed in globular proteins. This right-handed twist is due primarily to intrachain nonbonded interactions. Such interactions between the C gamma 1H3 group of the ith residue and the C gamma 2H3 group of the (i + 2)th residue of the same chain favor a twist of either handedness over the flat structure. However, many small intrastrand pair-wise interatomic interactions involving the C gamma 1H3 and C gamma 2H3 groups, especially the interactions of these groups with the O and amide H atoms of the neighboring peptide groups, make the right-handed twisted structure energetically more favorable than the left-handed one. The intrastrand side-chain torsional energy plays a small additional role in favoring the right-twisted structure over both the flat and the left-twisted structures. The interstrand interactions favor flat structures, but they are not strong enough to overcome the intrastrand interactions that favor the twisted structure; they only decrease somewhat the extent of the right-handed twist of the beta-sheets.
