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J Bacteriol. 1991 November; 173(21): 6760-6765
Molecular analysis of the Salmonella typhimurium phoN gene, which encodes nonspecific acid phosphatase.
M Kasahara,
A Nakata and
H Shinagawa
Department of Experimental Chemotherapy, Osaka University, Japan.
ABSTRACT
The phoN gene of Salmonella typhimurium encodes nonspecific acid phosphatase (EC 3.1.3.2), which is regulated by a two-component regulatory system consisting of the phoP and phoQ genes. We cloned the phoN region into a plasmid vector by complementation of a phoN mutant strain and determined the nucleotide sequence of the phoN gene and its flanking regions. The phoN gene could encode a 26-kDa protein, which was identified by the maxicell method as the product of phoN. Results of the enzyme assay and Southern hybridization with chromosomal DNA of Escherichia coli K-12 suggests that there is no phoN gene in E. coli. The regulatory pattern of phoN in E. coli and Southern hybridization analysis of the E. coli chromosome with the S. typhimurium phoP gene suggest that E. coli K-12 also harbors the phoP and phoQ genes.
J Bacteriol. 1991 November; 173(21): 6760-6765
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Copyright © 1991 by the American Society for Microbiology. All rights reserved.