A new SHV-derived extended-spectrum beta-lactamase (SHV-24) that hydrolyzes ceftazidime through a single-amino-acid substitution (D179G) in the omega-loop.
Kurokawa H., Yagi T., Shibata N., Shibayama K., Kamachi K., Arakawa Y.
A new SHV-derived extended-spectrum beta-lactamase (SHV-24) conferring high-level resistance to ceftazidime but not cefotaxime and cefazolin was identified in Japan. This enzyme was encoded by a transferable 150-kb plasmid from an Escherichia coli clinical isolate. The pI and K(m) for CAZ of this enzyme were 7.5 and 30 microM, respectively. SHV-24 was found to have a D179G substitution in the Omega-loop of the enzyme.
Antimicrob. Agents Chemother. 44:1725-1727(2000) [ PubMed | SRS | CiteXplore ]
