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Characterization of two sequential polytripeptides containing glycine and ethyl-glutamate residues

✍ Scribed by W. Barton Rippon; H. H. Chen; J. M. Anderson; A. G. Walton

Publisher: Wiley (John Wiley & Sons)
Year: 1972
Tongue: English
Weight: 475 KB
Volume: 11
Category: Article
ISSN: 0006-3525
DOI: 10.1002/bip.1972.360110709

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✦ Synopsis

The polytripeptides poly(glu(0Et)-ply-gly) and poly(glu(0Et)-glu(0Et)-gly) have been synthesized and characterized using infrared linear dichroism, ultraviolet circular dichroism spectroscopy, and electron microscopy. Both polymers have been obtained in a cross j 3 conformation with antiparallel chains, however, there appear to be significant differences in the stability of this conformation for the two polymers. Poly(glu(0Et)gly-gly) has also been shown to exist in a 31 polyglycine I1 type helix in aqueous solution whereas films cast from this solution appear to be random. Finally this same polymer can be obtained in either a random or an extended form from trifluoroacetic acid depending on the nature of the substrate used for film casting.

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