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Vibrational analysis of peptides, polypeptides, and proteins. XXI. β‐Calcium‐poly( L ‐glutamate)
Author(s) -
Sengupta Pradeep K.,
Krimm S.,
Hsu S. L.
Publication year - 1984
Publication title -
biopolymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/bip.360230811
Subject(s) - chemistry , raman spectroscopy , side chain , amide , alanine , glutamate receptor , calcium , crystallography , stereochemistry , amino acid , biochemistry , polymer , organic chemistry , physics , receptor , optics
The observed Raman and ir spectra of Ca‐poly( L ‐glutamate) in the β conformation have been analyzed by means of a normal mode calculation. The force field for the main chain was transferred without refinement from β‐poly( L ‐alanine), yet it provides a good prediction of the observed bands and, in particular, explains subtle differences in the spectra of these two β‐sheet structures. Main‐ and side‐chain modes are well characterized, and the dependence of the amide III frequency on side‐chain composition is again demonstrated.