Conformation of random polypeptide chains

Srinivasan, A. R. ; Rao, V. S. R. (1972) Conformation of random polypeptide chains Journal of Polymer Science, 10 (4). pp. 693-697. ISSN 0022-3832

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/pol.197...

Related URL: http://dx.doi.org/10.1002/pol.1972.160100411

Abstract

The characteristic ratios Cof and C are calculated for infinitely long poly(L-amino acid) chains having a-CH2-R' substitution at the Cα atom, as functions of the valence angle τ at the Cα atom. The value of Cof is found to increase from 1.6 to 2.3 as τ varies from 105 to 115°. On the other hand, Cα decreases with increasing τ in the range 105-111°, passes through a minimum at 111°, and then increases slowly. Since, C is much less dependent on τ in the most commonly observed range (110-115°), any variation in τ in this range due to solvent would not appreciably affect C. The calculated temperature coefficient of C is negative and increases significantly in absolute magnitude even for small deviations in τ from 110°.

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