ISDA

Entry Detail

PDB ID:

1ELF

Keywords:

COMPLEX (HYDROLASE/INHIBITOR)

Title:

NATURE OF THE INACTIVATION OF ELASTASE BY N-PEPTIDYL-O-AROYL HYDROXYLAMINE AS A FUNCTION OF PH

Biological Source:

Source Organism:

Sus scrofa

PDB Version:

Deposition Date:

1995-03-13

Release Date:

1995-07-10

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

1.70 Å

R-Value Work:

0.18

R-Value Observed:

0.18

Space Group:

P 21 21 21

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Description:PORCINE PANCREATIC ELASTASE
Chain IDs:A
Chain Length:240
Number of Molecules:1
Biological Source:Sus scrofa

UniProt ID:P00772 Pfam ID:PF00089 EC:3.4.21.36

Ligand Molecules

BAF

SO4

Primary Citation

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, Ding, X, Rasmussen, B.F, Petsko, G.A, Ringe, D, Demuth, H.-U, Silberring, J, Nyberg, F, Robinson, V.J, Coles, P.J, Smith, R.A, Krantz, A, Demuth, H.-U, Fischer, G, Barth, A, Schowen, R.L, Takahashi, L.H, Radhakrishnan, R, Rosenfield Junior, R.E, Meyer Junior, E.F, Trainor, D.A.Show

Biochemistry 34 7749 7756 (1995)

PMID: 7779821 DOI: 10.1021/bi00023a022

Abstact

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.

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Primary Citation of related structures