NDLI: Two different electron transfer pathways may involve in azoreduction in Shewanella decolorationis S12

Content Provider	Springer Nature Link
Author	Chen, Xingjuan Xu, Meiying Wei, Jinbo Sun, Guoping
Copyright Year	2009
Abstract	Electron transfer pathways for azoreduction by S. decolorationis S12 were studied using a mutant S12-22 which had a transposon insertion in ccmA. The results imply that there are two different pathways for electron transport to azo bonds. The colony of S12-22 was whitish and incapable of producing mature c-type cytochromes whose α-peak was at 553 nm in the wild type S12. The mutant S12-22 could not use formate as the sole electron donor for azoreduction either in vivo or in vitro, but intact cells of S12-22 were able to reduce azo dyes of low polarity, such as methyl red, when NADH was served as the sole electron donor. Although the highly polar-sulfonated amaranth could not be reduced by intact cells of S12-22, it could be efficiently reduced by cell extracts of the mutant when NADH was provided as the sole electron donor. These results suggest that the mature c-type cytochromes are essential electron mediators for the extracellular azoreduction of intact cells, while the other pathway without the involvement of mature c-type cytochromes, NADH-dependent oxidoreductase-mediated electron transfer pathway can reduce lowly polar sulfonated azo dyes inside the whole cells or highly polar sulfonated azo dyes in the cell extracts without bacterial membrane barriers.
Starting Page	743
Ending Page	751
Page Count	9
File Format	PDF
ISSN	01757598
Journal	Applied Microbiology and Biotechnology
Volume Number	86
Issue Number	2
e-ISSN	14320614
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-12-11
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Electron transfer pathways Azoreduction ccmA Azo dyes Shewanella decolorationis S12 Microbial Genetics and Genomics Microbiology Biotechnology
Content Type	Text
Resource Type	Article
Subject	Medicine Applied Microbiology and Biotechnology Biotechnology

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