Open reading frame ssr2016 is required for antimycin A-sensitive photosystem I-driven cyclic electron flow in the cyanobacterium Synechocystis sp. PCC 6803

N. Yeremenko, R. Jeanjean, P. Prommeenate, V. Krasikov, P.J. Nixon, W.F.J. Vermaas, M. Havaux, H.C.P. Matthijs

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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.
Original languageUndefined/Unknown
Pages (from-to)1433-1436
Number of pages4
JournalPlant and cell physiology
Issue number8
Publication statusPublished - 2005

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