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:  1ELG
- PubMed Abstract:
- Crystal Structure of the Covalent Complex Formed by a Peptidyl Difluoro Keto Amide with Porcine Pancreatic Elastase at 1.78 Angstroms Resolution
Takahashi, L.H.,Radhakrishnan, R.,Rosenfield Junior, R.E.,Meyer Junior, E.F.,Trainor, D.A.
(1989) J.Am.Chem.Soc. 111: 3368
- 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
- Competing Redox and Inactivation Processes in the Inhibition of Cysteine Proteinases by Peptidyl O-Acylhydroxamates. 13C and 15N NMR Evidence for a Novel Sulfenamide Enzyme Adduct
Robinson, V.J.,Coles, P.J.,Smith, R.A.,Krantz, A.
(1991) J.Am.Chem.Soc. 113: 7760
- Inhibition of Proteases with Enkephalin-Analogue Inhibitors
Demuth, H.-U.,Silberring, J.,Nyberg, F.
(1991) J.Enzyme Inhib. 4: 289
- 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
Demuth, H.-U.,Fischer, G.,Barth, A.,Schowen, R.L.
(1989) J.Org.Chem. 54: 5880
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.