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Vibrational analysis of peptides, polypeptides, and proteins. XXXII. α-Poly(L-glutamic acid)

✍ Scribed by Pradeep K. Sengupta; S. Krimm

Publisher
Wiley (John Wiley & Sons)
Year
1985
Tongue
English
Weight
670 KB
Volume
24
Category
Article
ISSN
0006-3525

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✦ Synopsis

The Raman and ir spectra of a-helical polybglutarnic acid) have been assigned on the basis of a normal mode calculation for this structure. The force field was based on our previously refined mainchain force constants for a-polyb-alanine) and side-chain force constants for /3calcium-poly(L-glutamate). Despite the identical backbone a-helical structures, significantly different frequencies are calculated, and observed, in the amide I11 and backbone stretch regions of a-poly(L-glutamic acid), as compared with apoly(L-alanine). This clearly demonstrates the influence of side-chain structure on mainchain vibrational modes.

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