Role and regulation of class-C flavodiiron proteins in photosynthetic organisms.

摘要: The regulation of photosynthesis is crucial to efficiently support the assimilation carbon dioxide and prevent photodamage. One key regulatory mechanism pseudo-cyclic electron flow (PCEF) mediated by class-C flavodiiron proteins (FLVs). These enzymes use electrons coming from Photosystem I (PSI) reduce oxygen water, preventing over-reduction in acceptor side PSI. FLVs are widely distributed among organisms performing oxygenic they have been shown be fundamental many different conditions such as fluctuating light, sulfur deprivation plant submersion. Moreover, since can help controlling redox status cell maintaining microoxic environment essential for processes nitrogen fixation cyanobacteria. Despite these important roles identified various species, genes encoding FLV lost angiosperms where their activity could at least partially compensated a more efficient cyclic (CEF). present work reviews information emerged on function, analyzing recent structural data that suggest regulated through conformational change.