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• W1972075462 abstract "ABSTRACT Shewanella putrefaciens MR-1 possesses a complex electron transport system which facilitates its ability to use a diverse array of compounds as terminal electron acceptors for anaerobic respiration. A previous report described a mutant strain (CMTn-1) deficient in CymA, a tetraheme cytochrome c . However, the interpretation of the electron transport role of CymA was complicated by the fact that CMTn-1 was also markedly deficient in menaquinones. This report demonstrates that the depressed menaquinone levels were the result of the rifampin resistance phenotype of the parent of CMTn-1 and not the interruption of the cymA gene. This is the first report of rifampin resistance leading to decreased menaquinone levels, indicating that rifampin-resistant strains should be used with caution when analyzing electron transport processes. A site-directed gene replacement approach was used to isolate a cymA knockout strain (MR1-CYMA) directly from MR-1. While MR1-CYMA retained menaquinone levels comparable to those of MR-1, it lost the ability to reduce iron(III), manganese(IV), and nitrate and to grow by using fumarate as an electron acceptor. All of these functions were restored to wild-type efficacy, and the presence of the cymA transcript and CymA protein was also restored, by complementation of MR1-CYMA with the cymA gene. The requirement for CymA in anaerobic electron transport to iron(III), fumarate, nitrate, and manganese(IV) is therefore not dependent on the levels of menaquinone in these cells. This represents the first successful use of a suicide vector for directed gene replacement in MR-1." @default.
• W1972075462 created "2016-06-24" @default.
• W1972075462 creator A5021492589 @default.
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• W1972075462 date "2000-01-01" @default.
• W1972075462 modified "2023-10-03" @default.
• W1972075462 title "Role of the Tetraheme Cytochrome CymA in Anaerobic Electron Transport in Cells of <i>Shewanella putrefaciens</i> MR-1 with Normal Levels of Menaquinone" @default.
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• W1972075462 doi "https://doi.org/10.1128/jb.182.1.67-75.2000" @default.
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