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Cai, Pei-Jie; Xiao, Xiang; He, Yan-Rong; Li, Wen-Wei; Chu, Jian; Wu, Chao; He, Meng-Xing; Zhang, Zhe; Sheng, Guo-Ping; Lam, Michael Hon-Wah; Xu, Fang; Yu, Han-Qing
Applied microbiology and biotechnology, 02/2012, Letnik: 93, Številka: 4Journal Article
In this work, we investigated the anaerobic decolorization of methyl orange (MO), a typical azo dye, by Shewanella oneidensis MR-1, which can use various organic and inorganic substances as its electron acceptor in natural and engineered environments. S. oneidensis MR-1 was found to be able to obtain energy for growth through anaerobic respiration accompanied with dissimilatory azo-reduction of MO. Chemical analysis shows that MO reduction occurred via the cleavage of azo bond. Block of Mtr respiratory pathway, a transmembrane electron transport chain, resulted in a reduction of decolorization rate by 80%, compared to the wild type. Knockout of cymA resulted in a substantial loss of its azo-reduction ability, indicating that CymA is a key c -type cytochrome in the electron transfer chain to MO. Thus, the MtrA-MtrB-MtrC respiratory pathway is proposed to be mainly responsible for the anaerobic decolorization of azo dyes such as MO by S. oneidensis .
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