1X8H image
Entry Detail
PDB ID:
1X8H
Keywords:
Title:
The Mono-Zinc Carbapenemase CphA (N220G mutant) Shows a Zn(II)- NH2 ARG Coordination
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2004-08-18
Release Date:
2004-12-28
Method Details:
Experimental Method:
Resolution:
1.60 Å
R-Value Free:
0.17
R-Value Work:
0.15
R-Value Observed:
0.15
Space Group:
C 2 2 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Beta-lactamase
Mutations:N220G
Chain IDs:A
Chain Length:228
Number of Molecules:1
Biological Source:Aeromonas hydrophila
Primary Citation
A Metallo-beta-lactamase Enzyme in Action: Crystal Structures of the Monozinc Carbapenemase CphA and its Complex with Biapenem
J.Mol.Biol. 345 785 795 (2005)
PMID: 15588826 DOI: 10.1016/j.jmb.2004.10.070

Abstact

One strategy developed by bacteria to resist the action of beta-lactam antibiotics is the expression of metallo-beta-lactamases. CphA from Aeromonas hydrophila is a member of a clinically important subclass of metallo-beta-lactamases that have only one zinc ion in their active site and for which no structure is available. The crystal structures of wild-type CphA and its N220G mutant show the structural features of the active site of this enzyme, which is modeled specifically for carbapenem hydrolysis. The structure of CphA after reaction with a carbapenem substrate, biapenem, reveals that the enzyme traps a reaction intermediate in the active site. These three X-ray structures have allowed us to propose how the enzyme recognizes carbapenems and suggest a mechanistic pathway for hydrolysis of the beta-lactam. This will be relevant for the design of metallo-beta-lactamase inhibitors as well as of antibiotics that escape their hydrolytic activity.

Legend

Protein

Chemical

Disease

Primary Citation of related structures