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Vibrational analysis of peptides, polypeptides, and proteins. II. β-Poly(L-alanine) and β-poly(L-alanylglycine)

✍ Scribed by W. H. Moore; S. Krimm

Publisher
Wiley (John Wiley & Sons)
Year
1976
Tongue
English
Weight
927 KB
Volume
15
Category
Article
ISSN
0006-3525

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✦ Synopsis

Abstract

The normal vibration frequencies of poly(L‐alanine) and poly(L‐alanylglycine) in the antiparallel chain‐pleated sheet structure have been calculated, using the force field for polyglycine I from the previous paper (Biopolymers 15, 2439–2464) plus additional force constants for the methyl group. The agreement with observed ir and Raman bands is very good. This substantiates the excellent transferability of the force field, since polyglycine I was shown to have a rippled‐sheet structure. The amide I and amide II mode splittings are very well accounted for by transition dipole coupling, showing that subtle structural differences are sensitively manifested through this mechanism.

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