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The electron donor for periplasmic chlorate reductase of Ideonella dechloratans has been suggested to be a soluble cytochrome c. We describe here the purification of the 9-kDa periplasmic cytochrome c, denoted cytochrome c-Id1, and demonstrate its ability to serve as an electron donor for purified chlorate reductase. The reaction rate was found to be linearly dependent on the cytochrome c concentration in the range of 0.6-4 μM. A route for electron transport involving a soluble cytochrome c is similar to that found for other periplasmic oxidoreductases of the dimethyl sulfoxide reductase family, but different from that suggested for the (per)chlorate reductase of Dechloromonas species.
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Bäcklund et al. (2011) studied this question.
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