## Abstract The thermal helix–coil transition of poly(γ‐benzyl L‐glutamate‐__co__‐ε‐carbobenzoxy‐L‐lysine) copolypeptides was studied in solvent mixtures of different compositions. The cooperativity parameter __v__ changes linearly with polymer (and solvent) composition, whereas the heat of the tra
Helix–coil transition in copolypeptides. I. Poly (γ-benzyl-co-γ-methyl L-glutamate)
✍ Scribed by A. Roig; M. Cortijo
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1971
- Tongue
- English
- Weight
- 361 KB
- Volume
- 10
- Category
- Article
- ISSN
- 0006-3525
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✦ Synopsis
Abstract
The helix–coil transition in poly(γ‐benzyl L‐glutamate‐co‐γ‐methyl L‐glutamate) copolypeptides was studied experimentally in nonaqueous solvents and the results compared with theory. It is found that the transition can be described by the same theory as for the homopolypeptides, but the corresponding parameters are not related in the expected way to those of the homopolymers, due to the effect of the side chains on the stability of the helix, which is not taken into account explicitly by the theory.
📜 SIMILAR VOLUMES
In this paper two points are considered: the methods of evaluating the helical content 8 and the calculation of the parameters of the transition from experimental data and its interpretation. The parameter AH obtained is in good agreement with the calorimetric one and v is found to be independent of
## Abstract The thermal helix–coil transition of four samples of poly(γ‐benzyl‐L‐glutamate) in the dioxane–dichloroacetic acid (DCA) mixture was studied by optical rotatory dispersion method. The transition occurred at very high DCA content (97.5% by weight) in this system. The transition parameter
The helix-coil transition of poly(ybenzy1 L-glutamate) was studied by comparing proton magnetic relaxation behavior with optical activity studies. The transition temperatnre as determined by magnetic relaxation was lower than that obtained by optical activity. The relationship of these experiments
## Abstract The coil to helix conformational transitions undergone by poly‐γ‐benzyl‐~L~‐glutamate in solutions of haloacetic acids and various cosolvents were studied by means of proton magnetic resonance. The results indicate a very small solvent dependence of the α‐CH Helix–coil chemical shift di
## Abstract The helix–coil conformational transition undergone by poly(γ‐benzyl‐L‐glutamate) in solutions of trifluoroacetic acid and deuterated chloroform was studied by proton and carbon‐13 nmr. The results indicate that in the case of the solvent‐induced helix–coil transition, the side chain ass