Open reading frame ssr2016 is required for antimycin A-sensitive photosystem I-driven cyclic electron flow in the cyanobacterium Synechocystis sp. PCC 6803.
Open reading frame ssr2016 encodes a protein with substantial sequence similarities to PGR5 identified as a component of the antimycin A-sensitive ferredoxin:plastoquinone reductase (FQR) in PSI cyclic photophosphorylation in Arabidopsis thaliana. We studied cyclic electron flow in Synechocystis sp. PCC 6803 in vivo in ssr2016 deletion mutants generated either in a wild-type background or in a ndhB deletion mutant. Our results indicate that ssr2016 is required for FQR and that it operates in a parallel pathway to the NDH1 complex. The ssr2016 deletion mutants are high light sensitive, suggesting that FQR might be important in controlling redox poise under adverse conditions.
Yeremenko
Nataliya
N
Aquatic Microbiology, Institute for Biodiversity and Ecosystem Dynamics, Faculty of Science, University of Amsterdam, Nieuwe Achtergracht 127, 1018 WS Amsterdam, The Netherlands.
Jeanjean
Robert
R
Prommeenate
Peerada
P
Krasikov
Vladimir
V
Nixon
Peter J
PJ
Vermaas
Wim F J
WF
Havaux
Michel
M
Matthijs
Hans C P
HC
D000968:Antimycin A / Q000494:pharmacology*; D029681:Arabidopsis Proteins / Q000378:metabolism; D004579:Electron Transport; D016366:Open Reading Frames; D045331:Photosystem I Protein Complex / Q000502:physiology*; D011808:Quinone Reductases / Q000378:metabolism; D046939:Synechocystis / Q000187:drug effects* / Q000235:genetics / Q000378:metabolism
D029681:Arabidopsis Proteins; D045331:Photosystem I Protein Complex; D000968:Antimycin A; C457770:FQR1 protein, Arabidopsis; D011808:Quinone Reductases