1ESD image
Entry Detail
PDB ID:
1ESD
Title:
THE MOLECULAR MECHANISM OF ENANTIORECOGNITION BY ESTERASES
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
1994-10-07
Release Date:
1995-10-15
Method Details:
Experimental Method:
Resolution:
2.30 Å
R-Value Observed:
0.18
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:ESTERASE
Chain IDs:A
Chain Length:306
Number of Molecules:1
Biological Source:Streptomyces scabiei
Ligand Molecules
Primary Citation
A novel variant of the catalytic triad in the Streptomyces scabies esterase.
Nat.Struct.Biol. 2 218 223 (1995)
PMID: 7773790 DOI: 10.1038/nsb0395-218

Abstact

The crystal structure of a novel esterase from Streptomyces scabies, a causal agent of the potato scab disease, was solved at 2.1 A resolution. The tertiary fold of the enzyme is substantially different from that of the alpha/beta hydrolase family and unique among all known hydrolases. The active site contains a dyad of Ser 14 and His 283, closely resembling two of the three components of typical Ser-His-Asp(Glu) triads from other serine hydrolases. Proper orientation of the active site imidazol is maintained by a hydrogen bond between the N delta-H group and a main chain oxygen. Thus, the enzyme constitutes the first known natural variation of the chymotrypsin-like triad in which a carboxylic acid is replaced by a neutral hydrogen-bond acceptor.

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Primary Citation of related structures