The redox state of plastoquinone pool regulates state transitions via cytochrome b 6 f complex in Synechocystis sp. PCC 6803

FEBS Letters

Mao, Hai-Bin¹  Ruan, Xiang¹  Zhao, Nan-Ming¹  Wu, Qing-Yu¹  Li, Guo-Fu¹  Zhang, Xiu-Fang¹  Gong, Yan-Dao¹ 

[1] State Key Laboratory of Biomembrane and Membrane Biotechnology, Department of Biological Sciences and Biotechnology, Tsinghua University, Beijing 100084, PR China

关键词: State transition;    Plastoquinone;    Cytochrome b 6 f;    Cyanobacteria;    Chl;    chlorophyll;    DBMIB;    2;    5-dibromo-3-methyl-6-isopropyl-1;    4-benzoquinone;    DCMU;    3-(3;    4-dichlorophenyl)-1;    1-dimethyl urea;    Fm;    maximum fluorescence;    where all QA is reduced and all non-photochemical quenching processes are at a minimum (e.g. in the presence of either DCMU plus actinic light or far-red light);    Fm′;    fluorescence intensity with all QA reduced under other conditions;    PS I;    photosystem I;    PS II;    photosystem II;    PBQ;    phenyl-1;    4-benzoquinone;    PBS;    phycobilisomes;    PQ;    plastoquinone;    PQH2;    plastoquinol;   

DOI  :  10.1016/S0014-5793(02)02715-1

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

The effects of benzoquinone analogues, phenyl-1,4-benzoquinone (PBQ) and 2,5-dibromo-3-methyl-6-isopropyl-1,4-benzoquinone (DBMIB), on state transitions in Synechocystis sp. PCC 6803 were investigated. PBQ induced a transition from state 2 to state 1 in the absence of actinic light whereas DBMIB caused a state 2 transition. 3-(3,4-Dichlorophenyl)-1,1-dimethyl urea could not eliminate the effects of PBQ and DBMIB. These results imply that the redox state of the plastoquinone pool controls the state transitions in vivo and cytochrome b ₆ f complex is involved in this process. As a working hypothesis, we propose that the occupancy of the quinol oxidation site and the movement of the Rieske protein may be pivotal in this regulation.

【 授权许可】

Unknown