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  • Title: Isolation of a Rhodobacter capsulatus mutant that lacks c-type cytochromes and excretes porphyrins.
    Author: Biel SW, Biel AJ.
    Journal: J Bacteriol; 1990 Mar; 172(3):1321-6. PubMed ID: 2155198.
    Abstract:
    A Rhodobacter capsulatus mutant lacking cytochrome oxidase activity was isolated by Tn5 mutagenesis. Difference spectroscopy of crude extracts and extracted c-type cytochromes demonstrated that this mutant completely lacked all c-type cytochromes. The strain did, however, synthesize normal amounts of b-type cytochromes and nonheme iron. This mutant also excreted large amounts of coproporphyrin and protoporphyrin and synthesized reduced amounts of bacteriochlorophyll, suggesting a link between the synthesis of c-type cytochromes and the expression of the tetrapyrrole biosynthetic pathway.
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