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Antimicrob. Agents Chemother., Dec 1997, 2757-2759, Vol 41, No. 12
Copyright © 1997 by the American Society for Microbiology. All rights reserved.

Cloning and nucleotide sequence analysis of a gene encoding an OXA- derived beta-lactamase in Acinetobacter baumannii

J Vila, M Navia, J Ruiz and C Casals
Departament de Microbiologia, Hospital Clinic, Facultat de Medicina, Universitat de Barcelona, Spain. vila@microclinic.med.ub.es

A clinical strain of Acinetobacter baumannii (strain Ab41) that was resistant to all beta-lactam antibiotics tested except ceftazidime, ceftriaxone, ceftizoxime, and imipenem produced three beta-lactamases: a presumptive chromosomal cephalosporinase, a TEM-1-like beta-lactamase (pI 5.4), and a novel OXA-derived beta-lactamase named OXA-21 (pI 7.0). The gene encoding OXA-21 was located in an integron. The nucleotide sequence showed three mutations compared with the sequence of OXA-3, with two being silent; the nonsilent mutation generated a substitution of Ile-217 to Met.


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