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The PsbZ subunit of photosystem II in Synechocystis sp PCC 6803 modulates electron flow through the photosynthetic electron transfer chain

Bishop, CL; Ulas, S; Baena-Gonzalez, E; Aro, EM; Purton, S; Nugent, JHA; Maenpaa, P; (2007) The PsbZ subunit of photosystem II in Synechocystis sp PCC 6803 modulates electron flow through the photosynthetic electron transfer chain. PHOTOSYNTH RES , 93 (1-3) 139 - 147. 10.1007/s11120-007-9182-0.

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Abstract

The psbZ gene of Synechocystis sp. PCC 6803 encodes the similar to 6.6 kDa photosystem II (PSII) subunit. We here report biophysical, biochemical and in vivo characterization of Synechocystis sp. PCC 6803 mutants lacking psbZ. We show that these mutants are able to perform wild-type levels of light-harvesting, energy transfer, PSII oxygen evolution, state transitions and non-photochemical quenching (NPQ) under standard growth conditions. The mutants grow photoautotrophically; however, their growth rate is clearly retarded under low-light conditions and they are not capable of photomixotrophic growth. Further differences exist in the electron transfer properties between the mutants and wild type. In the absence of PsbZ, electron flow potentially increased through photosystem I (PSI) without a change in the maximum electron transfer capacity of PSII. Further, rereduction of P700(+) is much faster, suggesting faster cyclic electron flow around PSI. This implies a role for PsbZ in the regulation of electron transfer, with implication for photoprotection.

Type: Article
Title: The PsbZ subunit of photosystem II in Synechocystis sp PCC 6803 modulates electron flow through the photosynthetic electron transfer chain
DOI: 10.1007/s11120-007-9182-0
Keywords: non-photochemical quenching, photosynthesis, photosystem II, PsbZ, Synechocystis sp, PCC 6803, CHLOROPLAST DNA, TRANSPORT, GENE, SEQUENCE, ARCHITECTURE, COMPLEXES, REVEALS, PHOTOPHOSPHORYLATION, PHOTOPROTECTION, INACTIVATION
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences > Structural and Molecular Biology
URI: http://discovery.ucl.ac.uk/id/eprint/54609
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