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Optical properties of the polyglycine II helix
Author(s) -
Rippon W. B.,
Walton A. G.
Publication year - 1971
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.360100710
Subject(s) - chemistry , circular dichroism , aqueous solution , helix (gastropod) , glycine , crystallography , salt (chemistry) , amino acid , spectral line , polymer , stereochemistry , organic chemistry , biochemistry , ecology , physics , astronomy , snail , biology
The circular dichroism spectrum obtained from a dilute aqueous solution of poly (ala‐gly‐gly) resembles that described for charged polypeptides such as the salt form of poly glutamic acid. A similar spectrum is found for films cast from aqueous solution where x‐ray studies reported elsewhere have indicated a poly‐glycinc II conformation. Evidence is presented for a heat induced poly‐glycine II to unordered state transition similar to that described for collagen. The interpretation of this, the first observation of the optical properties of a poly‐amino acid in the poly glycine II conformation, is further rationalized on the basis of spectra obtained from a number of polypeptides whose conformation approaches that of a 3 1 helix.