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Global gene expression of a ΔPsbO:ΔPsbU mutant and a spontaneous revertant in the cyanobacterium Synechocystis sp. strain PCC 6803

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Abstract

The photosystem II (PSII) double mutant ΔPsbO:ΔPsbU was unable to grow photoautotrophically at pH 7.5, but growth was restored at pH 10. We have isolated a pseudorevertant of this strain, which exhibited photoautotrophic growth at pH 7.5. PSII-specific oxygen evolution and assembled PSII centers in the pseudorevertant and the original ΔPsbO:ΔPsbU strains were similar at pH 7.5. Comparison of global gene expression of the two strains at pH 7.5 revealed that <4% of genes differed. In the pseudorevertant, up-regulated transcripts included stress-responsive genes, many of which were shown previously to be under the control of Hik34. Elevated transcripts included those encoding heat shock proteins (HspA, DnaK2 and HtpG), two Deg proteases (DegP and DegQ), and the orange carotenoid protein (OCP, Slr1963). Up-regulated genes encoded proteins localized to different cell compartments, including the thylakoid, plasma and outer membranes. We suggest that the cell wide up-regulation of stress response genes in the pseudorevertant may limit the impact of PSII instability that is observed in the ΔPsbO:ΔPsbU strain. Futhermore, the OCP has a photoprotective role mediating phycobilisome-associated nonphotochemical quenching, such that increased OCP levels in the pseudorevertant may reduce photons reaching these impaired centers. These two responses, in combination with uncharacterized stress responses, are sufficient to permit the growth of pseudorevertant at pH 7.5.

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Abbreviations

OEC:

Oxygen-evolving complex

PSII:

Photosystem II

Hik:

Histidine kinase

ROS:

Reactive oxygen species

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Acknowledgements

This work was supported by a grant from the Department of Energy (DE-F002-99ER20342) to Louis A Sherman and in part by a New Zealand Marsden grant (UOO309) to Julian Eaton-Rye. This article honors the various contributions of Govindjee to photosynthesis and fluorescence from cyanobacteria beginning in the mid 1960s.

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Authors and Affiliations

  1. Department of Biological Sciences, Purdue University, 1392 Lilly Hall of Life Sciences, West Lafayette, IN, 47907, USA

    Tina C. Summerfield & Louis A. Sherman

  2. Department of Biochemistry, University of Otago, P. O. Box. 56, Dunedin, New Zealand

    Julian J. Eaton-Rye

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  1. Tina C. Summerfield
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  2. Julian J. Eaton-Rye
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  3. Louis A. Sherman
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Correspondence to Louis A. Sherman.

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Summerfield, T.C., Eaton-Rye, J.J. & Sherman, L.A. Global gene expression of a ΔPsbO:ΔPsbU mutant and a spontaneous revertant in the cyanobacterium Synechocystis sp. strain PCC 6803. Photosynth Res 94, 265–274 (2007). https://doi.org/10.1007/s11120-007-9237-2

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