Environmental biology

Quinone-mediated decolorization of sulfonated azo dyes by cells and cellextracts from Sphingomonas xenophaga

JIAO Ling , LU Hong , ZHOU Jiti , WANG Jing


Received May 06, 2008,Revised August 06, 2008, Accepted , Available online

Volume 21,2009,Pages 503-508

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The effects of various quinone compounds on the decolorization rates of sulfonated azo dyes by Sphingomonas xenophaga QYY were investigated. The results showed that anthraquinone-2-sulfonate (AQS) was the most effective redox mediator and AQS reduction was the rate-limited step of AQS-mediated decolorization of sulfonated azo dyes. Based on AQS biological toxicity tests, it was assumed that AQS might enter the cells and kill them. In the cytoplasmic extracts from strain QYY, AQS more effectively increased decolorization rates of sulfonated azo dyes than other quinone compounds. In addition, we found a NADH/FMN-dependent AQS reductase using nondenaturing polyacrylamide gel electrophoresis (Native-PAGE).

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