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. 2012 Aug 29;68(Pt 9):999–1002. doi: 10.1107/S1744309112030552

Figure 1.

Figure 1

Mechanism of inhibition. The N-terminal proline (with a lowered pK a) nucleophilically attacks the central C atom of the isothiocyanate moiety, forming a new covalent bond. This produces a stable thiourea adduct as the inhibited form of the enzyme.