期刊
ARCHIVES OF MICROBIOLOGY
卷 173, 期 1, 页码 35-41出版社
SPRINGER VERLAG
DOI: 10.1007/s002030050005
关键词
phosphonopyruvate; hydrolase; C-P bond; inducible; phosphonoalanine; organophosphonates; deregulated; pho regulon
类别
A novel, inducible carbon-phosphorus bond cleavage enzyme, phosphonopyruvate hydrolase, was detected in cell-free extracts of Burkholderia cepacia Pa16, an environmental isolate capable of mineralising L-phosphonoalanine as carbon, nitrogen and phosphorus source. The activity was induced only in the presence of phosphonoalanine, did not require phosphate starvation for induction and was uniquely specific for phosphonopyruvate, producing equimolar quantities of pyruvate and inorganic phosphate. The native enzyme had a molecular mass of some 232 kDa and showed activation by metal ions in the order Co2+ > Ni2+ > Mg2+ > Zn2+ > Fe2+ > Cu2+ Temperature and pH optima in crude cell extracts were 50 degrees C and 7.5, respectively, and activity was inhibited by EDTA, phosphite, sulfite, mercaptoethanol and sodium azide. Phosphonopyruvate hydrolase is the third bacterial C-P bond cleavage enzyme reported to date that proceeds via a hydrolytic mechanism.
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