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Relative stability of the α‐helix of deuterated poly(γ‐benzyl‐ L ‐glutamate)
Author(s) -
Karasz F. E.,
Gajnos G. E.
Publication year - 1976
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.1976.360151006
Subject(s) - chemistry , deuterium , protonation , solvent , helix (gastropod) , dichloroacetic acid , enthalpy , glutamate receptor , molecule , stereochemistry , crystallography , organic chemistry , biochemistry , thermodynamics , ion , ecology , physics , quantum mechanics , snail , biology , receptor
The coil‐to‐helix transition temperatures of hydrogen bearing and deuterated poly(γ‐benzyl‐ L ‐glutamate) in 1,3‐dichlorotetrafluoroacetone/H 2 O and/D 2 O mixtures, respectively, have been determined. Together with previously obtained data for the conformational transition of this polypeptide in normal and deuterated dichloroacetic acid, these results have been used in an analysis of the effect of deuterium substitution on the intrinsic stability of the α‐helical form of poly(γ‐benzyl‐ L ‐glutamate). The findings, consistent for both solvent systems, showed that the deuterated polypeptide is some 5% more stable than the normal protonated poly(γ‐benzyl‐ L ‐glutamate), while the polypeptide‐active solvent interaction enthalpy is also slightly increased by deuterium substitution in the respective molecules. A consideration of available data for poly(β‐benzyl‐ L ‐aspartate) reveals an anomaly with respect to the present analysis.