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© Research
Publication : Antimicrobial agents and chemotherapy

Genetic and biochemical characterization of OXA-63, a new class D beta-lactamase from Brachyspira pilosicoli BM4442

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Antimicrobial agents and chemotherapy - 22 Jan 2008

Meziane-Cherif D, Lambert T, Dupêchez M, Courvalin P, Galimand M

Link to Pubmed [PMID] – 18212108

Antimicrob. Agents Chemother. 2008 Apr;52(4):1264-8

Brachyspira pilosicoli BM4442, isolated from the feces of a patient with diarrhea at the Hospital Saint-Michel in Paris, was resistant to oxacillin (MIC > 256 microg/ml) but remained susceptible to cephalosporins and to the combination of amoxicillin and clavulanic acid. Cloning and sequencing of the corresponding resistance determinant revealed a coding sequence of 807 bp encoding a new class D beta-lactamase named OXA-63. The bla OXA-63 gene was chromosomally located and not part of a transposon or of an integron. OXA-63 shared 54% identity with FUS-1 (OXA-85), an oxacillinase from Fusobacterium nucleatum subsp. polymorphum, and 25 to 44% identity with other class D beta-lactamases (DBLs) and contained all the conserved structural motifs of DBLs. Escherichia coli carrying the bla OXA-63 gene exhibited resistance to benzylpenicillin and amoxicillin but remained susceptible to amoxicillin in combination with clavulanic acid. Mature OXA-63 consisted of a 31.5-kDa polypeptide and appeared to be dimeric. Kinetic analysis revealed that OXA-63 exhibited a narrow substrate profile, hydrolyzing oxacillin, benzylpenicillin, and ampicillin with catalytic efficiencies of 980, 250, and 150 mM(-1) s(-1), respectively. The enzyme did not apparently interact with oxyimino-cephalosporins, imipenem, or aztreonam. Unlike FUS-1 and other DBLs, OXA-63 was strongly inhibited by clavulanic acid (50% inhibitory concentration [IC50] of 2 microM) and tazobactam (IC50 of 0.16 microM) and exhibited low susceptibility to NaCl (IC50 of >2 M). OXA-63 is the first DBL described for the anaerobic spirochete B. pilosicoli.

http://www.ncbi.nlm.nih.gov/pubmed/18212108