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An analysis of the amide I mode in the vibrational spectra of unordered polypeptides and proteins

✍ Scribed by P. C. Painter; M. M. Coleman

Publisher: Wiley (John Wiley & Sons)
Year: 1978
Tongue: English
Weight: 610 KB
Volume: 17
Category: Article
ISSN: 0006-3525
DOI: 10.1002/bip.1978.360171014

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✦ Synopsis

Abstract

The difference in the observed frequency of the amide I mode between the Raman and ir spectra of many unordered polypeptides is interpreted in terms of a model in which sequences of amide groups have similar ϕ, ψ angles. The splittings due to intramolecular interactions for the infinite helices generated by all ϕ, ψ angles are calculated by assuming transition dipole coupling. The effect of finite sequence length and distortions are then considered. This hypothesis accounts for the general features of the amide I mode of unordered polypeptides.

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