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Comprehensive conformational analysis of (Gly-Pro-Pro)n and (Gly-Pro-Hyp)n related to collagen

✍ Scribed by Vladimir G. Tumanyan; Natalia G. Esipova

Publisher: Wiley (John Wiley & Sons)
Year: 1982
Tongue: English
Weight: 959 KB
Volume: 21
Category: Article
ISSN: 0006-3525
DOI: 10.1002/bip.360210302

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✦ Synopsis

Abstract

A complete analysis of all possible conformations with correct hydrogen bonds of the collagen II type was performed on the basis of developed simultaneous equations. Using a unimodal search (by varying Ψ^3^), the energetically favorable structure was obtained. No other energetically satisfactory structural solutions are possible. The next aim was to obtain a precise model of the molecule. The program used includes a subroutine for continual deformation of the pyrrolidine rings. The set of parameters determining the structure consists of 14 independent variables (8 dihedral and 6 bond angles). As starting points for the energy optimization, conformations produced by scanning and some structures from previous work were used. The final structures (practically the same for both polymers) have helix parameters h = 0.285 nm and t = 52°, which are in excellent agreement with the 7/2 symmetry of diffraction data. The conformations of the pyrrolidine rings are of the B type, i.e., C~2~‐C^β^‐exo‐C^γ^‐endo. For both polypeptides, the conformations of imino acids in position 3 of the triplet are the same; in position 2, however, they are slightly different. The difference in diffraction patterns for the 7/2 and 10/3 helices is discussed.

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