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Synthèse et structure de la poly-O-carbobenzoxy L- tyrosine et de copolymères de O-carbobenzoxy L-tyrosine et de glutamate de benzyle ou d'aspartate de benzyle

✍ Scribed by Jean-Pierre Vollmer; Gérard Spach

Publisher
Wiley (John Wiley & Sons)
Year
1967
Tongue
English
Weight
699 KB
Volume
5
Category
Article
ISSN
0006-3525

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✦ Synopsis

The optical rotatory dispersion of copolyniers of 0-carbobenzoxy-L-tyrosine and benzyl L (or D)-glutamate as well as henzyl L-aspartate, dissolved in nonpolar solvent, has been studied. Moffitt's equation permits the determination of bo coefficients %-hose variation, with varying composition in amino acid residues, suggests that the molecules of poly-0-carbobenzoxy-L-tyrosine have a helical structure similar to that of 11oly-(benxyl L-glutamate). Results obtained from infrared spectroscopy and x-ray diffraction show that the copolymers possess a helical conformation in the solid state, even when they are very rich in carboberizoxy-L-tyrosine residues. The value of the b,, coefficient for poly-0-carbobenzoxy-L-tyrosine may be explained by a regular stacking of the chromophore groiips around the helical backbone. The ordering of the mo1ec:iiles of t,his polymer in a purely helical st.ructure seems favored by the insertion of a small number of foreign residues in the polypeptide chain.

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