The structure of an inactive mutant, heat-labile enterotoxin raises the possibility of a direct functional role for an internal, water-filled cavity.
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Merritt, E., Sarfaty, S., Pizza, M. et al. Mutation of a buried residue causes loss of activity but no conformational change in the heat-labile enterotoxin of Escherichia coli. Nat Struct Mol Biol 2, 269–272 (1995). https://doi.org/10.1038/nsb0495-269
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DOI: https://doi.org/10.1038/nsb0495-269