A comparative structural and functional analysis of cyanobacterial plastocyanin and cytochrome c6 as alternative electron donors to Photosystem I: Photosystem I reduction in cyanobacteria (original) (raw)

This study investigates the role of a newly identified c-class cytochrome, Cyt c M, as a potential electron donor to Photosystem I (PSI) in cyanobacteria, specifically in relation to well-known redox carriers Cyt c 6 and plastocyanin (Pc). The presence of Cyt c M is induced under stress conditions, suggesting it may serve a compensatory function when Cyt c 6 and Pc are repressed. Experimental comparisons of these proteins reveal differences in their physicochemical properties and functional capabilities, leading to insights about the electron transfer mechanisms in cyanobacteria.