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Research Article

Decolorizing Activity of Malachite Green and Its Mechanisms Involved in Dye Biodegradation by Achromobacter xylosoxidans MG1

Wang J. · Qiao M. · Wei K. · Ding J. · Liu Z. · Zhang K.-Q. · Huang X.

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Laboratory for Conservation and Utilization of Bio-Resources, and Key Laboratory for Microbial Resources of the Ministry of Education, Yunnan University, Kunming, China

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J Mol Microbiol Biotechnol 2011;20:220–227

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Article / Publication Details

First-Page Preview
Abstract of Research Article

Published online: August 25, 2011
Issue release date: October 2011

Number of Print Pages: 8
Number of Figures: 7
Number of Tables: 0

ISSN: 1464-1801 (Print)
eISSN: 1660-2412 (Online)

For additional information: http://www.karger.com/MMB

Abstract

An Achromobacter xylosoxidans MG1 strainisolated from the effluent treatment plant of a textile and dyeing factory from Yunnan Province in China was found capable of decolorizing the malachite green dye at a high efficacy. Strain MG1 reduced 86% malachite green at the concentration of 2,000 mg/l within 1 h, representing a greater ability for decolorizing and a higher tolerance of this compound than all previously reported bacteria. Color removal was optimal at pH 6 and 38°C. Further experimental evidences demonstrated that both cytoplasmic and extracellular biodegradation contributed to the decolorization of malachite green. Nested PCR was employed to identify the candidate genes responsible for malachite green decolorization, and we identified a cytoplasmic triphenylmethane reductase gene with 100% amino acid similarity to the corresponding gene in Citrobacter sp. strain. In contrast to our expectation, the addition of metyrapone had little effect on the cytoplasmic biodegradation, suggesting that cytochrome P450 was not involved in the high-performance reduction. The extracellular biodegradation was likely attributable to the secretion of extracellular proteases and some heat-resistant compounds.

© 2011 S. Karger AG, Basel


Article / Publication Details

First-Page Preview
Abstract of Research Article

Published online: August 25, 2011
Issue release date: October 2011

Number of Print Pages: 8
Number of Figures: 7
Number of Tables: 0

ISSN: 1464-1801 (Print)
eISSN: 1660-2412 (Online)

For additional information: http://www.karger.com/MMB


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