Nature of the inactivation of elastase by N-peptidyl-O-aroyl hydroxylamine as a function of pH.Ding, X., Rasmussen, B.F., Demuth, H.U., Ringe, D., Steinmetz, A.C.
(1995) Biochemistry 34: 7749-7756
- PubMed: 7779821
- Primary Citation of Related Structures:
- PubMed Abstract:
- N-O Bond Fission as the Rate-Determining Step in the Aqueous Conversion of N-Peptidyl-O-(P-Nitrobenzoyl)Hydroxylamines to P-Nitrobenzoic Acid and Peptidylhydroxamic Acids
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(1989) J.Org.Chem. 54: 5880
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- Direct Structural Observation of an Acyl-Enzyme Intermediate in the Hydrolysis of an Ester Substrate by Elastase
Ding, X.,Rasmussen, B.F.,Petsko, G.A.,Ringe, D.
(1994) Biochemistry 33: 9285
- Inhibition of Proteases with Enkephalin-Analogue Inhibitors
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The mechanism of inactivation of porcine pancreatic elastase (PPE) by N-peptidyl-O-aroylhydroxylamine was studied by X-ray crystallography. The inactivator forms a stable complex with the enzyme by means of a covalent attachment to the active site Se ...
The mechanism of inactivation of porcine pancreatic elastase (PPE) by N-peptidyl-O-aroylhydroxylamine was studied by X-ray crystallography. The inactivator forms a stable complex with the enzyme by means of a covalent attachment to the active site Ser 203(195) O gamma. The nature of the complex is, however, different depending on the pH at which the inactivation reaction occurs. At pH 5, the complex formed is a hydroxylamine derivative of Ser 203(195) in which the O gamma of serine is the oxygen of the hydroxylamine derivative. At pH 7.5, the complex formed is a carbamate derivative at Ser 203(195) O gamma. In both types of complexes, the inactivator binds in the S' subsites of the enzyme instead of forming the usual antiparallel beta-sheet with the S subsites. The implication for the mechanism of inactivation at different pHs is discussed.
Department of Chemistry, Brandeis University, Waltham, Massachusetts 02254, USA.