Abstract
We have determined the structure of a metastable disulphide isomer of human insulin. Although not observed for proinsulin folding or insulin-chain recombination, the isomer retains ordered secondary structure and a compact hydrophobic core. Comparison with native insulin reveals a global rearrangement in the orientation of A- and B-chains. One face of the protein's surface is nevertheless in common between native and non-native structures. This face contains receptor-binding determinants, rationalizing the partial biological activity of the isomer. Structures of native and non-native disulphide isomers also define alternative three-dimensional templates. Threading of insulin-like sequences provide an experimental realization of the inverse protein-folding problem.
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Hua, QX., Gozani, S., Chance, R. et al. Structure of a protein in a kinetic trap. Nat Struct Mol Biol 2, 129–138 (1995). https://doi.org/10.1038/nsb0295-129
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DOI: https://doi.org/10.1038/nsb0295-129
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