title: Purification and characterization of rhodanese from Acinetobacter calcoaceticus.
abstract: Rhodanese (thiosulfate : cyanide sulfur transferase, EC 2,8,1,1) was found to be contitutively present as an intracellular enzyme in Acinetobacter calcoaceticus. The soluble enzyme was purified 40.9-fold by a procedure which included ultracentrifugation, ethanol precipitation, CM-Sephadex batchwise separation, QAE-50 ion exchange chromatography, and socrose density gradient ultracentrifugation. The enxyme had a molecular weight of approximately 35000 with a pH optimum of 8-8.5. Activity was substantially enhanced by supplements of 2-mercaptoethanol and to a lesser extent by cysteine-HCl or reduced gluthatione. No degradation of the enzyme into smaller subunits was observed when treated with 2-mercaptoethanol.
mesh_terms: D000150:Acinetobacter / Q000201:enzymology*; D002474:Cell-Free System; D006863:Hydrogen-Ion Concentration; D008970:Molecular Weight; D013379:Substrate Specificity; D013466:Sulfurtransferases / Q000302:isolation & purification*; D013696:Temperature; D013884:Thiosulfate Sulfurtransferase / Q000037:antagonists & inhibitors / Q000302:isolation & purification*
chemical_list: D013466:Sulfurtransferases; D013884:Thiosulfate Sulfurtransferase