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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Sequence of the gene encoding a plasmid-mediated cefotaxime-hydrolyzing class A beta-lactamase (CTX-M-4): involvement of serine 237 in cephalosporin hydrolysis.

The sequence of the gene encoding a novel cefotaxime-hydrolyzing beta-lactamase (CTX-M-4) was determined. It was located in a plasmid harbored by a Salmonella typhimurium strain. CTX-M-4 was similar to the plasmidic cefotaxime-hydrolyzing beta-lactamases CTX-M-2 and Toho-1 and related to the chromosomal beta-lactamase of Klebsiella oxytoca. A Ser-237-->Ala substitution, introduced by site-directed mutagenesis, caused minor alterations in the interaction of CTX-M-4 with beta-lactams, reducing slightly the relative hydrolytic activity against cefotaxime and the susceptibility to inhibition by clavulanate.[1]

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