Journal Article

Open Reading Frame <i>ssr</i>2016 is Required for Antimycin A-sensitive Photosystem I-driven Cyclic Electron Flow in the Cyanobacterium <i>Synechocystis</i> sp. PCC 6803

Nataliya Yeremenko, Robert Jeanjean, Peerada Prommeenate, Vladimir Krasikov, Peter J. Nixon, Wim F. J. Vermaas, Michel Havaux and Hans C. P. Matthijs

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 46, issue 8, pages 1433-1436
Published in print August 2005 | ISSN: 0032-0781
Published online August 2005 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pci147
Open Reading Frame ssr2016 is Required for Antimycin A-sensitive Photosystem I-driven Cyclic Electron Flow in the Cyanobacterium Synechocystis sp. PCC 6803

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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.

Keywords: Antimycin A; Ferredoxin quinone reductase; Photosystem I cyclic electron transport; ssr2016; Synechocystis sp. PCC 6803; AA, antimycin A; FQR, ferredoxin:quinone reductase; NDH1, NAD(P)H dehydrogenase type 1; NPQ, non-photochemical quenching; PQ, plastoquinone; SDH, succinate dehydrogenase; WT, wild type

Journal Article.  3040 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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