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Energy calculations on helical polypeptides: Structure of polyglycine II

✍ Scribed by V. N. Balaji

Publisher
John Wiley and Sons
Year
1981
Tongue
English
Weight
401 KB
Volume
20
Category
Article
ISSN
0020-7608

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✦ Synopsis

Abstract

Single chain and packing energy calculations have been made on polyglycine (threefold and fourfold helical structures) with interchain NH…︁O hydrogen bonds. In conformation A of polyglycine, in which the NH groups point away from the helix axis and the CO groups are nearer to the helix axis, the conformational energy is nearly the same for threefold and fourfold structures. However, the minimum energy conformation corresponds to a threefold structure of polyglycine with peptide configurations in conformation B in which the CO groups point away from the helix axis and NH groups are nearer to the helix axis. This structure is consistent with the polyglycine II x‐ray diffraction data.

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