2PR8 image
Deposition Date 2007-05-04
Release Date 2008-04-08
Last Version Date 2024-02-21
Entry Detail
PDB ID:
2PR8
Keywords:
Title:
crystal structure of aminoglycoside N-acetyltransferase AAC(6')-Ib11
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.10 Å
R-Value Free:
0.25
R-Value Work:
0.19
R-Value Observed:
0.20
Space Group:
C 2 2 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Aminoglycoside 6-N-acetyltransferase type Ib11
Gene (Uniprot):aac(6')-Ib
Chain IDs:A, B
Chain Length:196
Number of Molecules:2
Biological Source:Salmonella typhimurium
Ligand Molecules
Primary Citation
Enzyme structural plasticity and the emergence of broad-spectrum antibiotic resistance.
Embo Rep. 9 344 349 (2008)
PMID: 18292754 DOI: 10.1038/embor.2008.9

Abstact

The emergence of multi-resistant pathogenic bacteria is a worldwide health issue. Recently, clinical variants of a single antibiotic-modifying acetyltransferase, AAC(6')-Ib-a variant of aminoglycoside 6'-N-acetyltransferase-have been identified that confer extended resistance to most aminoglycosides and, more surprisingly, to structurally unrelated fluoroquinolones. The corresponding gene is carried by mobile genetic elements and is present in most multi-resistant pathogenic strains, hence making it a serious threat to current therapies. Here, we report the crystal structures of both narrow- and broad-spectrum resistance variants of this enzyme, which reveal the structural basis for the emergence of extended resistance. The active site shows an important plasticity and has adapted to new substrates by a large-scale gaping process. We have also obtained co-crystals with both substrates, and with a simple transition state analogue, which provides new clues for the design of inhibitors of this resistance mechanism.

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Primary Citation of related structures