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  • Title: Crystal structure of an extended-conformation leucine-enkephalin dimer monohydrate.
    Author: Mastropaolo D, Camerman A, Ma LY, Camerman N.
    Journal: Life Sci; 1987 May 18; 40(20):1995-9. PubMed ID: 3573990.
    Abstract:
    The structure of a new crystal form of leucine-enkephalin has been determined by X-ray diffraction. There are two independent molecules in the asymmetric unit and both have extended peptide backbone conformations with side-chains arranged alternately above and below the backbone planes. The two pentapeptides are hydrogen-bonded to each other and to other molecules forming an extended antiparallel beta-pleated sheet. The structure differs from that in similar crystals of methionine enkephalin primarily in side-chain orientations and inter-sheet interactions.
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