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Hexavalent chromium reduction by an actinomycete, Arthrobacter crystallopoietes ES 32

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Abstract

Environmental contamination by hexavalent chromium, Cr(VI), presents a serious public health problem. This study assessed the reduction of Cr(VI) by intact cells and a cell-free extract (CFE) of an actinomycete, Arthrobacter crystallopoietes (strain ES 32), isolated from soil contaminated with dichromate. Both intact cells and CFE of A. crystallopoietes, displayed substantial reduction of Cr(VI). Intact cells reduced about 90% of the Cr(VI) added within 12 h and Cr(VI) was almost completely reduced after 24 h. The K M and V max of Cr(VI) bioreduction by intact cells were 2.61 µM and 0.0142 µmol/min/mg protein, respectively. Cell-free chromate reductase of the A. crystallopoietes (ES 32) reduced hexavalent chromium at a K M of 1.78 µM and a V max of 0.096 µmol/min/mg protein. The rate constant (k) of chromate reduction was inversely related to Cr(VI) concentration and the half-life (t 1/2) of Cr(VI) reduction increased with increasing concentration. A. crystallopoietes produced a periplasmic chromate reductase that was stimulated by NADH. Results indicate that A. crystallopoietes ES 32 can be used to detoxify Cr(VI) in polluted sites, particularly in stressed environments.

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Authors and Affiliations

  1. Department of Environmental Science, University of California, 92521, Riverside, CA

    F. A.O Camargo, F. M. Bento, B. C. Okeke & W. T. Frankenberger

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  1. F. A.O Camargo
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  2. F. M. Bento
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  3. B. C. Okeke
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  4. W. T. Frankenberger
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Camargo, F.A., Bento, F.M., Okeke, B.C. et al. Hexavalent chromium reduction by an actinomycete, Arthrobacter crystallopoietes ES 32. Biol Trace Elem Res 97, 183–194 (2004). https://doi.org/10.1385/BTER:97:2:183

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  • DOI: https://doi.org/10.1385/BTER:97:2:183

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