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- W1588335020 abstract "The relative stabilities of a- and Blo-helical structures for polymers of a-aminoisobutyric acid (Aib) have been worked out, using the classical potential energy functions. To make a comparative study, we have used Buckingham 6-exp and Kitaigorodsky's potential functions. Conformational analysis of the dipeptide segment with Aib residue indicates the necessity for nonplanar distortion of the peptide unit, which is a common feature in the observed crystal structures with Aib residues. In the range of Aw -10 to +loo studied, a-helical conformations are preferred in the region -3 < Aw < +loo, and Blo-helical conformationsare preferred in the region -3 > Aw > -10'. Minimum energy conformations for right-handed structures are found in the +ue region of Aw and correspondingly for left-handed structures in the -ue region of Aw. For Aw - 6, a-helical structures have four- or near fourfold symmetry with h - 1.5 A. Such a helix with n = 4 and h = 1.5 A is termed an a'-helix. This structure is found to be consistent with the electron diffraction data of Malcolm3 and energetically more favorable than the standard 310-helix." @default.
- W1588335020 created "2016-06-24" @default.
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- W1588335020 date "1979-11-01" @default.
- W1588335020 modified "2023-09-23" @default.
- W1588335020 title "A Case Study of the Conformation of Poly(alpha-aminoisobutyric acid): alpha- or 310-Helix" @default.
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