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Rhizobium (Sinorhizobium) meliloti phn genes: characterization and identification of their protein products

Parker, George F., Higgins, Timothy, Hawkes, Timothy and Robson, Robert L. 1999. Rhizobium (Sinorhizobium) meliloti phn genes: characterization and identification of their protein products. Journal of Bacteriology 181 (2) , pp. 389-395.

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In Escherichia coli, the phn operon encodes proteins responsible for the uptake and breakdown of phosphonates. The C-P (carbon-phosphorus) lyase enzyme encoded by this operon which catalyzes the cleavage of C-P bonds in phosphonates has been recalcitrant to biochemical characterization. To advance the understanding of this enzyme, we have cloned DNA fromRhizobium (Sinorhizobium) melilotithat contains homologues of the E. coli phnG, -H, -I, -J, and -Kgenes. We demonstrated by insertional mutagenesis that the operon from which this DNA is derived encodes the R. meliloti C-P lyase. Furthermore, the phenotype of this phn mutant shows that the C-P lyase has a broad substrate specificity and that the organism has another enzyme that degrades aminoethylphosphonate. A comparison of the R. meliloti and E. coli phngenes and their predicted products gave new information about C-P lyase. The putative R. meliloti PhnG, PhnH, and PhnK proteins were overexpressed and used to make polyclonal antibodies. Proteins of the correct molecular weight that react with these antibodies are expressed by R. meliloti grown with phosphonates as sole phosphorus sources. This is the first in vivo demonstration of the existence of these hitherto hypothetical Phn proteins.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Subjects: Q Science > QR Microbiology
Publisher: American Society for Microbiology
ISSN: 0021-9193
Last Modified: 04 Jun 2017 07:53

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