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Cyanobacterial flv4-2 Operon-Encoded proteins Optimize Light Harvesting and Charge Separation in Photosystem Ⅱ

Molecular Plant 2015年第5期8卷 747-761页

作者： Volha Chukhutsina Luca Bersanini Eva-Mari Aro Herbert van Amerongen Laboratory of Biophysics Wageningen University P.O. Box 8128 6700 ET Wageningen The Netherlands MicroSpectroscopy Centre Wageningen University 6703HA Wageningen The Netherlands BioSolarCells P.O. Box 98 6700AB Wageningen The Netherlands Department of Biochemistry Molecular Plant Biology University of Turku FI-20014 Turku Finland These authors contributed equally to this article

Photosystem Ⅱ （PSII） complexes drive the water-splitting reaction necessary to transform sunlight into chemical energy. However, too much light can damage and disrupt PSlh In cyanobacteria, the flv4-2 operon encodes three proteins （FIv2, FIv4, and S110218）, which safeguard PSll activity under air-level CO2 and in high light conditions. However, the exact mechanism of action of these proteins has not been clarified yet. We demonstrate that the PSII electron transfer properties are influenced by the flv4-2 operon-encoded pro- teins. Accelerated secondary charge separation kinetics was observed upon expression/overexpression of the flv4-2 operon. This is likely induced by docking of the FIv2/FIv4 heterodimer in the vicinity of the QB pocket of PSlI, which, in turn, increases the QB redox potential and consequently stabilizes forward electron transfer. The alternative electron transfer route constituted by FIv2/FIv4 sequesters electrons from QB- guaranteeing the dissipation of excess excitation energy in PSII under stressful conditions. In addition, we demonstrate that in the absence of the flv4-2 operon-encoded proteins, about 20% of the phycobilisome antenna becomes detached from the reaction centers, thus decreasing light harvesting. Phycobilisome detachment is a consequence of a decreased relative content of PSII dimers, a feature observed in the absence of the SII0218 protein.

关键词： electron transfer flavodiiron proteins light harvesting photoprotection photosystem Ⅱ

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