Glutathione S-transferase Pi has at least three distinguishable xenobiotic substrate sites close to its glutathione-binding site.

Abstract excerpt

Benzyl isothiocyanate (BITC), present in cruciferous vegetables, is an efficient substrate of human glutathione S-transferase P1-1 (hGST P1-1). BITC also acts as an affinity label of hGST P1-1 in the absence of glutathione, yielding an enzyme inactive toward BITC as substrate. As monitored by using BITC as substrate, the dependence of k of inactivation (K(I)) of hGST P1-1 on [BITC] is hyperbolic, with K(I) = 66...

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