Journal
PLANT PHYSIOLOGY
Volume 167, Issue 2, Pages 481-U755Publisher
OXFORD UNIV PRESS INC
DOI: 10.1104/pp.114.253336
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Funding
- National Science Foundation Arabidopsis Project [MCB-0519740, MCB-1119778]
- Wilhelm and Martina Lundgrens Foundation
- Gothenburg University
- Wallenberg Foundation
- Lars Hiertas Foundation
- Helge Axel Ax:son Foundation
- Wenner-Gren Foundation
- Wallenbergs Foundation
- Swedish Energy Authority
- Office of Science (Biological and Environmental Research), U.S. Department of Energy [FC02-02ER63421]
- National Institutes of Health [GM100753]
- Lady Davis Foundation of the Hebrew University in Jerusalem, Israel
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Photosystem II (PSII) is a multiprotein complex that catalyzes the light-driven water-splitting reactions of oxygenic photosynthesis. Light absorption by PSII leads to the production of excited states and reactive oxygen species that can cause damage to this complex. Here, we describe Arabidopsis (Arabidopsis thaliana) At1g71500, which encodes a previously uncharacterized protein that is a PSII auxiliary core protein and hence is named PHOTOSYSTEM II PROTEIN33 (PSB33). We present evidence that PSB33 functions in the maintenance of PSII-light-harvesting complex II (LHCII) supercomplex organization. PSB33 encodes a protein with a chloroplast transit peptide and one transmembrane segment. In silico analysis of PSB33 revealed a light-harvesting complex-binding motif within the transmembrane segment and a large surface-exposed head domain. Biochemical analysis of PSII complexes further indicates that PSB33 is an integral membrane protein located in the vicinity of LHCII and the PSII CP43 reaction center protein. Phenotypic characterization of mutants lacking PSB33 revealed reduced amounts of PSII-LHCII supercomplexes, very low state transition, and a lower capacity for nonphotochemical quenching, leading to increased photosensitivity in the mutant plants under light stress. Taken together, these results suggest a role for PSB33 in regulating and optimizing photosynthesis in response to changing light levels.
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