Characterization and expression of the co-transcribed cyc1 and cyc2 genes encoding the cytochrome c sub(4) (c sub(552)) and a high-molecular-mass cytochrome c from Thiobacillus ferrooxidans ATCC 33020

The sequence of the cyc1 gene encoding the Thiobacillus ferrooxidans ATCC 33020 c sub(552) cytochrome, shows that this cytochrome is a 21-kDa periplasmic c sub(4)-type cytochrome containing two similar monohaem domains. The kinetics of reduction and the fact that cytochromes c sub(4) are considered...

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Bibliographic Details
Published in:FEMS microbiology letters 1998-10, Vol.167 (2), p.171-177
Main Authors: Appia-Ayme, C, Bengrine, A, Cavazza, C, Giudici-Orticoni, M-T, Bruschi, M, Chippaux, M, Bonnefoy, V
Format: Article
Language:English
Subjects:
Thiobacillus ferrooxidans
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Summary:The sequence of the cyc1 gene encoding the Thiobacillus ferrooxidans ATCC 33020 c sub(552) cytochrome, shows that this cytochrome is a 21-kDa periplasmic c sub(4)-type cytochrome containing two similar monohaem domains. The kinetics of reduction and the fact that cytochromes c sub(4) are considered to be physiological electron donors of cytochrome oxidases suggest that the last steps of the iron respiratory chain are: rusticyanin arrow right cytochrome c sub(4) arrow right cytochrome oxidase. In Thiobacillus ferrooxidans, cyc1 is co-transcribed with the cyc2 gene, encoding a high-molecular-mass monohaem cytochrome c. This suggests that the cytochromes encoded by these genes belong to the same electron transfer chain.
ISSN:0378-1097