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Peptidyl O-acyl hydroxamates: potent new inactivators of cathepsin B
R A Smith1, P J Coles, R W Spencer
1Syntex Research, Mississauga, Ontario, Canada.
Biochemical and Biophysical Research Communications
|September 30, 1988
Abstract:
Peptidyl O-acyl hydroxamates having appropriate active-site recognition features are very potent time-dependent inhibitors of the cysteine proteinase cathepsin B. The inhibition is irreversible, and the inactivation rate is strongly dependent on peptide structure and correct positioning of the P1 amino acid carbonyl group. Lipophilic O-acyl groups provide the most rapid inactivators, as exemplified by the inhibitor O-mesitoyl N-benzyloxycarbonyl-L-phenylalanyl-L-alanine hydroxamate (kmax/Ki = 640,000 M-1s-1).