Hexavalent-chromium reduction by a chromate-resistant Bacillus sp. strain.
Bacillus strain QC1-2, isolated from a chromium-polluted zone, was selected by its high ability to both tolerate and reduce hexavalent chromium [Cr(VI)] to less-toxic trivalent chromium [Cr(III)]. Cell suspensions of strain QC1-2 rapidly reduced Cr(VI), in both aerobic and anaerobic conditions, to Cr(III) which remained in the supernatant. Cr(VI) reduction was dependent on the addition of glucose but sulfate, an inhibitor of chromate transport, had no effect. Studies with permeabilized cells and cell extracts showed that the Cr(VI) reductase of strain QC1-2 is a soluble NADH-dependent enzyme.
Campos
J
J
Instituto de Investigaciones Quimico-Biologicas, Universidad Michoacana, Morelia, Mexico.
Martinez-Pacheco
M
M
Cervantes
C
C
D000332:Aerobiosis; D000693:Anaerobiosis; D001407:Bacillus / Q000187:drug effects / Q000378:metabolism*; D001412:Bacillus subtilis / Q000187:drug effects / Q000378:metabolism; D001426:Bacterial Proteins / Q000378:metabolism*; D002463:Cell Membrane Permeability; D002840:Chromates / Q000378:metabolism* / Q000494:pharmacology; D004352:Drug Resistance, Microbial; D005947:Glucose / Q000378:metabolism; D010084:Oxidation-Reduction; D010088:Oxidoreductases / Q000378:metabolism*; D011550:Pseudomonas aeruginosa / Q000187:drug effects / Q000378:metabolism; D013431:Sulfates / Q000494:pharmacology
D001426:Bacterial Proteins; D002840:Chromates; D013431:Sulfates; D010088:Oxidoreductases; C063243:chromate reductase; D005947:Glucose