Structure–reactivity relationships in the inactivation of elastase by β-sultams
作者:Paul S. Hinchliffe、J. Matthew Wood、Andrew M. Davis、Rupert P. Austin、R. Paul Beckett、Michael I. Page
DOI:10.1039/b208079f
日期:——
N-Acyl-β-sultams are time dependent irreversible active site directed inhibitors of elastase. The rate of inactivation is first order with respect to β-sultam concentration and the second order rate constants show a similar dependence on pH to that for the hydrolysis of a peptide substrate. Inactivation is due to the formation of a stable l â¶ l enzyme inhibitor complex as a result of the active site serine being sulfonylated by the β-sultam. Ring opening of the β-sultam occurs by SâN fission in contrast to the CâN fission observed in the acylation of elastase by N-acylsulfonamides. Structureâactivity effects are compared between sulfonylation of the enzyme and alkaline hydrolysis. Variation in 4-alkyl and N-substituted β-sultams causes differences in the rates of inactivation by 4 orders of magnitude.