Dörte Falke, Marco Fischer, Bianca Biefel, Christian Ihling, Claudia Hammerschmidt, Kevin Reinefeld, Alexander Haase, Andrea Sinz, R Gary Sawers
Streptomyces coelicolor A3(2), an obligately aerobic, oxidase-positive, and filamentous soil bacterium, lacks a soluble cytochrome c in its respiratory chain, having instead a membrane-associated diheme c-type cytochrome, QcrC. This necessitates complex formation to allow electron transfer between the cytochrome bcc and aa3 oxidase respiratory complexes. Combining genetic complementation studies with in-gel cytochrome oxidase activity staining, we demonstrate that the complete qcrCAB-ctaCDFE gene locus on the chromosome, encoding, respectively, the bcc and aa3 complexes, is required to manifest a cytochrome oxidase enzyme activity in both spores and mycelium of a qcr-cta deletion mutant...
March 12, 2019: Journal of Molecular Microbiology and Biotechnology