Abstract
The amino acid sequences of garden bean (Phaseolus vulgaris) trypsin inhibitor II and a related molecular species II' have been examined. The entire sequence of II' has been determined with the exception of five internal residues. The garden bean inhibitors are highly homologous to the Bowman-Birk soybean inhibitor and lima bean trypsin inhibitor IV. The trypsin-reactive site has been located in the second half of the molecule, while the first reactive site has been found to be directed against elastase. Garden bean inhibitor II (and II') is thus a double-headed inhibitor, simultaneously inhibiting 1 molecule of trypsin and 1 of elastase.
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