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Crystal structure of an antifreeze polypeptide and its mechanistic implications

Abstract

The X-ray crystallographic structure of an antifreeze polypeptide from the fish winter flounder, has been determined at 2.5 Å by an analysis of the Patter son function. This is the first report of a polypeptide of this size that is a single α-helix. A proposed mechanism of antifreeze binding to ice surfaces is given which requires: first, that the dipole moment from the helical structure dictates the preferential alignment of the peptide to the c-axis of ice nuclei; second, amphiphilicity of the helix; and third, torsional freedom of the side chains to facilitate hydrogen bonding to ice surfaces.

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Yang, D., Sax, M., Chakrabartty, A. et al. Crystal structure of an antifreeze polypeptide and its mechanistic implications. Nature 333, 232–237 (1988). https://doi.org/10.1038/333232a0

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