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The cytochromes of Chlorobium thiosulfatophilum |
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| Authors: | T E Meyer R G Bartsch M A Cusanovich and J H Mathewson |
| Institution: | a Department of Chemistry, University of California, San Diego, La Jolla, Calif. 92037, U.S.A. b Department of Chemistry, San Diego State College, San Diego, Calif. 92115, U.S.A. |
| Abstract: | Three c-type cytochromes (c-551, c-553, c-555) have been isolated and characterized from a strain of the green photosynthetic bacterium Chlorobium thiosulfatophilum. These cytochromes are atypical when compared to horse heart cytochrome c in many properties, among them: oxidation-reduction potential at pH 7.0 (c-551, 135 mV; c-553, 98 mV; c-555, 145 mV), molecular weight (c-551, 45000–60000; c-553, 50000; c-555, 10000) and isolelectric point (c-551, 6.0; c-553, 6.7). No protoheme was detected in whole cells or cell-free extracts. |
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