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Antimicrob Agents Chemother. 1989 June; 33(6): 951-956

SHV-5, a novel SHV-type beta-lactamase that hydrolyzes broad-spectrum cephalosporins and monobactams.

Laboratoire de Microbiologie Médicale, Hospital Broussais, Paris, France.

ABSTRACT

SHV-5 (pI 8.2), a novel broad-spectrum beta-lactamase encoded by a ca. 150-kilobase plasmid, was found in Klebsiella pneumoniae 160. SHV-5 beta-lactamase caused decreased susceptibility to most penicillins, cephalosporins, and monobactams, except imipenem and compounds which have a C6 or C7 alpha-methoxy substituent. beta-Lactamase inhibitors (clavulanic acid, sulbactam, and tazobactam) inhibited its activity and showed a synergistic effect when associated with different hydrolyzable beta-lactam compounds. Hybridization studies suggested that this enzyme may be related to, or derived from, the SHV enzyme. Increased MICs of cephamycins and temocillin associated with a decreased synergistic effect of the inhibitors on K. pneumoniae 160 might be linked to a decrease in two outer membrane proteins.

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