1E25 image
Deposition Date 2000-05-17
Release Date 2000-11-06
Last Version Date 2024-05-08
Entry Detail
PDB ID:
1E25
Keywords:
Title:
The high resolution structure of PER-1 class A beta-lactamase
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.90 Å
R-Value Free:
0.18
R-Value Work:
0.14
R-Value Observed:
0.14
Space Group:
P 43
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:EXTENDED-SPECTRUM BETA-LACTAMASE PER-1
Gene (Uniprot):PER-1
Mutations:YES
Chain IDs:A
Chain Length:282
Number of Molecules:1
Biological Source:PSEUDOMONAS AERUGINOSA
Ligand Molecules
Primary Citation
The High Resolution Crystal Structure for Class a Beta-Lactamase Per-1 Reveals the Bases for its Increase in Breadth of Activity
J.Biol.Chem. 275 28075 ? (2000)
PMID: 10825176 DOI: 10.1074/JBC.M003802200

Abstact

The treatment of infectious diseases by beta-lactam antibiotics is continuously challenged by the emergence and dissemination of new beta-lactamases. In most cases, the cephalosporinase activity of class A enzymes results from a few mutations in the TEM and SHV penicillinases. The PER-1 beta-lactamase was characterized as a class A enzyme displaying a cephalosporinase activity. This activity was, however, insensitive to the mutations of residues known to be critical for providing extended substrate profiles to TEM and SHV. The x-ray structure of the protein, solved at 1.9-A resolution, reveals that two of the most conserved features in class A beta-lactamases are not present in this enzyme: the fold of the Omega-loop and the cis conformation of the peptide bond between residues 166 and 167. The new fold of the Omega-loop and the insertion of four residues at the edge of strand S3 generate a broad cavity that may easily accommodate the bulky substituents of cephalosporin substrates. The trans conformation of the 166-167 bond is related to the presence of an aspartic acid at position 136. Selection of class A enzymes based on the occurrence of both Asp(136) and Asn(179) identifies a subgroup of enzymes with high sequence homology.

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Primary Citation of related structures