A study of alpha-helix hydration in polypeptides, proteins, and viruses using vibrational raman optical activity

Journal of the American Chemical Society
Iain H McCollLaurence D Barron

Abstract

A vibrational Raman optical activity (ROA) study, supplemented by protein X-ray crystal structure data, of alpha-helices in polypeptides, proteins, and viruses has suggested that ROA bands in the extended amide III spectral region may be used to distinguish between two types of right-handed alpha-helix. One type, associated with a positive ROA band at approximately 1300 cm(-1), dominates in hydrophobic environments and appears to be unhydrated; the other, associated with a positive ROA band at approximately 1340 cm(-1), dominates in hydrophilic environments and appears to be hydrated. Evidence is presented to support the hypothesis that unhydrated alpha-helix corresponds to the canonical conformation alpha(c) and hydrated alpha-helix to a more open conformation alpha(o) stabilized by hydrogen bonding of a water molecule or a hydrophilic side chain to the peptide carbonyl. Alpha-helical poly(L-lysine) and poly(L-ornithine) in aqueous solution and poly(L-alanine) in dichloracetic acid display both bands, but alpha-helical poly(l-glutamic acid) in aqueous solution and poly(gamma-benzyl L-glutamate) in CHCl(3) display only the approximately 1340 cm(-1) band and so may exist purely as alpha(o) due to enhanced stabilization of this c...Continue Reading

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Citations

Mar 15, 2012·Analytical and Bioanalytical Chemistry·Shigeki Yamamoto
Oct 29, 2013·Physical Chemistry Chemical Physics : PCCP·Andrea N L BatistaEwan W Blanch
Jun 30, 2006·Virology Journal·Phelps J LambertShaw M Akula
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