Cytochrome <i>c</i><sub>M</sub> Decreases Photosynthesis under Photomixotrophy in <i>Synechocystis</i> sp. PCC 6803
Dániel Solymosi, Lauri Nikkanen, Dorota Muth‐Pawlak, Duncan Fitzpatrick, Ravendran Vasudevan, Christopher J. Howe, David J. Lea‐Smith, Yagut Allahverdiyeva
Abstract
fluxes and effective yields of PSI and PSII. Overall, this resulted in a higher growth rate compared to that of the wild type, which was maintained by accumulation of proteins involved in phosphate and metal uptake, and cofactor biosynthetic enzymes. While the exact role of CytM has not been determined, a mutant deficient in the thylakoid-localized respiratory terminal oxidases and CytM (ΔCox/Cyd/CytM) displayed a phenotype similar to that of ΔCytM under photomixotrophy. This, in combination with other physiological data, and in contrast to a previous hypothesis, suggests that CytM does not transfer electrons to these complexes. In summary, our data suggest that CytM may have a regulatory role in photomixotrophy by modulating the photosynthetic capacity of cells.