Abstract
POLYGLYCINE II was shown to be a new structural form of polyglycine on the basis of its characteristic X-ray diffraction pattern1 and infra-red spectrum1,2. On the basis of the spacings in the powder diffraction pattern1, Crick and Rich3 proposed a model for this structure consisting of parallel polypeptide chains, each with a three-fold screw axis, packed in a hexagonal array. A slight modification of this structure has recently been suggested4, although the parallel chain characteristic was retained. We wish to draw attention to experimental evidence which requires that antiparallel chains be present in polyglycine II.
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KRIMM, S. Antiparallelism of Chains in Polyglycine II. Nature 212, 1482–1483 (1966). https://doi.org/10.1038/2121482a0
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DOI: https://doi.org/10.1038/2121482a0
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