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J Bacteriol. 1990 October; 172(10): 5783-5788

research-article

Cloning and expression of a Staphylococcus aureus gene encoding a peptidoglycan hydrolase activity.

Department of Biological Sciences, Illinois State University, Normal 61761.

ABSTRACT

A gene of Staphylococcus aureus PS47 encoding lytic activity was cloned and expressed in Escherichia coli. Deletion analysis of a recombinant plasmid carrying a 7.4-kilobase-pair fragment (kbp) of S. aureus DNA suggested that the gene was located within a 2.5-kbp EcoRI-XbaI fragment. Analysis of extracts of E. coli harboring recombinant plasmids on denaturing polyacrylamide gels containing purified cell walls of S. aureus showed a clearing zone by a polypeptide of apparent Mr 23,000. The release of dinitrophenylalanine but not reducing groups from purified cell walls by a cell extract of recombinant E. coli suggested that we had cloned an N-acetylmuramyl-L-alanine amidase.

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