title: Purification and properties of an organophosphorus acid anhydrase from a halophilic bacterial isolate.
abstract: A moderately halophilic bacterial isolate has been found to possess high levels of enzymatic activity against several highly toxic organophosphorus compounds. The predominant enzyme, designated organophosphorus acid anhydrase 2, has been purified 1,000-fold to homogeneity and characterized. The enzyme is a single polypeptide with a molecular weight of 60,000. With diisopropylfluorophosphate as a substrate, the enzyme has optimum activity at pH 8.5 and 50 degrees C, and it is stimulated by manganese and cobalt.
authors.affiliation: U.S. Army Chemical Research, Development & Engineering Center, Aberdeen Proving Ground, Maryland 21010-5423.
authors.forename: J J
authors.initials: JJ
authors.lastname: DeFrank
authors.forename: T C
authors.initials: TC
authors.lastname: Cheng
mesh_terms: D000911:Antibodies, Monoclonal / Q000276:immunology; D001426:Bacterial Proteins / Q000276:immunology / Q000302:isolation & purification; D015153:Blotting, Western; D002845:Chromatography; D004950:Esterases; D006090:Gram-Negative Bacteria / Q000201:enzymology* / Q000276:immunology; D006863:Hydrogen-Ion Concentration; D006867:Hydrolases / Q000037:antagonists & inhibitors / Q000302:isolation & purification* / Q000378:metabolism; D007700:Kinetics; D008670:Metals / Q000494:pharmacology; D008970:Molecular Weight; D009943:Organophosphorus Compounds / Q000378:metabolism*; D044345:Phosphoric Triester Hydrolases; D013379:Substrate Specificity; D013439:Sulfhydryl Reagents / Q000494:pharmacology; D013696:Temperature
chemical_list: D000911:Antibodies, Monoclonal; D001426:Bacterial Proteins; D008670:Metals; D009943:Organophosphorus Compounds; D013439:Sulfhydryl Reagents; C002226:diisopropylphosphate; D006867:Hydrolases; D004950:Esterases; D044345:Phosphoric Triester Hydrolases; C020061:diisopropyl-fluorophosphatase