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X‐Ray studies on the conformation of poly‐N γ ‐carbobenzoxy‐ L ‐α,γ‐diaminobutyric acid and poly‐N δ ‐carbobenzoxy‐ L ‐ornithine
Author(s) -
Del Pra A.,
Spadon P.,
Valle G.
Publication year - 1973
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.1973.360120422
Subject(s) - monoclinic crystal system , chemistry , crystallography , hexagonal crystal system , molecule , polymer , trigonal crystal system , helix (gastropod) , solid state , stereochemistry , crystal structure , organic chemistry , ecology , snail , biology
X‐ray diagrams from oriented films and fibers of poly‐ N γ ‐carbobenzoxy‐ L ‐α,γ‐diaminobutyric acid (PCLB) and of poly‐ N δ ‐carbobenzoxy‐L‐ornithine (PCLO) have been examined. The conformation in the solid state for both polymers is that of an α‐helix, 18/5 for PCLB and 11/3 for PCLO, respectively. Furthermore, while the PCLB molecules are packed in a trigonal lattice whose dimensions, on hexagonal axes, are a = 27.5 and c = 27.0 Å, the PCLO unit cell is monoclinic with a = 23.3, b = 22.7, c = 16.2 Å, and γ = 119.2°.