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Antimicrobial Agents and Chemotherapy, December 2001, p. 3595-3598, Vol. 45, No. 12
0066-4804/01/$04.00+0   DOI: 10.1128/AAC.45.12.3595-3598.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Characterization of a Chromosomally Encoded Extended-Spectrum Class A beta -Lactamase from Kluyvera cryocrescens

Jean W. Decousser, Laurent Poirel, and Patrice Nordmann*

Service de Bactériologie-Virologie, Hôpital de Bicêtre, Assistance Publique/Hôpitaux de Paris, Faculté de Médecine Paris-Sud, 94275 Le Kremlin-Bicêtre, France

Received 26 February 2001/Returned for modification 23 June 2001/Accepted 28 August 2001

A chromosomally located beta -lactamase gene, cloned and expressed in Escherichia coli from a reference strain of the enterobacterial species Kluyvera cryocrescens, encoded a clavulanic acid-inhibited Ambler class A enzyme, KLUC-1, with a pI value of 7.4. KLUC-1 shared 86% amino acid identity with a subgroup of plasmid-mediated CTX-M-type extended-spectrum beta -lactamases (CTX-M-1, -3, -10, -11, and -12), the most closely related enzymes, and 77% amino acid identity with KLUA-1 from Kluyvera ascorbata. The substrate profile of KLUC-1 corresponded to that of CTX-M-type enzymes.

* Corresponding author. Mailing address: Service de Bactériologie-Virologie, Hôpital de Bicêtre, 78 rue du Général Leclerc, 94275 Le Kremlin-Bicêtre Cedex, France. Phone: 33-1-45-21-36-32. Fax: 33-1-45-21-63-40. E-mail: nordmann.patrice{at}bct.ap-hop-paris.fr.

Antimicrobial Agents and Chemotherapy, December 2001, p. 3595-3598, Vol. 45, No. 12
0066-4804/01/$04.00+0   DOI: 10.1128/AAC.45.12.3595-3598.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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