A tripeptide molecule, L‐alanyl‐glycyl‐glycine, crystallizes in the form of a left‐handed helix with (ϕ,ψ) = −83°, 170°. A pseudohexagonal packing arrangement and interchain hydrogen‐bonded interactions are reminiscent of the model for the structure of poly(glycine)‐II. Observations of certain intermolecular interactions appear to be relevant to the stereochemical assumptions incorporated in the models proposed for poly(glycine)‐II and related polypeptides.
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Subramanian et al. (1983) studied this question.
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