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Spectral analysis of cytochromes in aquaspirillum magnetotacticum






Current Microbiology 15(3): 121-128

Spectral analysis of cytochromes in aquaspirillum magnetotacticum

The respiratory chain of Aquaspirillum magnetotacticum strain MS-1 cells denitrifying microaerobically included a-, a1-, b-, c-, cd1-, and o-type hemes. More than 85% of the total cytochromes detected were of the c type. Virtually all of the a and b types were detected in cell membranes, whereas 70% of the c-type hemes were soluble. Large quantities of soluble c-type hemes were released with periplasm by freezing and thawing cells. Soluble c551 occurred in two forms: as a single compound of apparent molecular weight of 17,000 daltons, which bound CO, and, together withr d1 heme, as a component of nitrite reductase. Both a1-type hemes (which usually comprise part of the "low aeration" cytochrome oxidase) and o types (usually part of the "high aeration" oxidase) were simultaneously expressed in microaerobically grown denitrifying cells of A. magnetotacticum; this indicated branching of the respiratory chain.


Accession: 006459398



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