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PSB33 sustains photosystem II D1 protein under fluctuating light conditions

Artikel i vetenskaplig tidskrift
Författare R. Fristedt
A. Trotta
M. Suorsa
Anders K. Nilsson
R. Croce
E. M. Aro
Björn Lundin
Publicerad i Journal of Experimental Botany
Volym 68
Nummer/häfte 15
Sidor 4281-4293
ISSN 0022-0957
Publiceringsår 2017
Publicerad vid Institutionen för biologi och miljövetenskap
Sidor 4281-4293
Språk English
Länkar 10.1093/jxb/erx218
Ämnesord Arabidopsis, chloroplast, fluctuating lights, photosynthesis, PSB33, PSII, quality control of PSII, state, harvesting complex-ii, state transitions, arabidopsis-thaliana, plant, chloroplasts, chlorophyll-a, stn7 kinase, phosphorylation, repair, acclimation, biogenesis, rra rj, 1989, biochimica et biophysica acta, v975, p384
Ämneskategorier Biologiska vetenskaper

Sammanfattning

On Earth, solar irradiance varies as the sun rises and sets over the horizon, and sunlight is thus in constant fluctuation, following a slow dark-low-high-low-dark curve. Optimal plant growth and development are dependent on the capacity of plants to acclimate and regulate photosynthesis in response to these changes of light. Little is known of regulative processes for photosynthesis during nocturnal events. The nucleus-encoded plant lineage-specific protein PSB33 has been described as stabilizing the photosystem II complex, especially under light stress conditions, and plants lacking PSB33 have a dysfunctional state transition. To clarify the localization and function of this protein, we used phenomic, biochemical and proteomics approaches in the model plant Arabidopsis. We report that PSB33 is predominantly located in non-appressed thylakoid regions and dynamically associates with a thylakoid protein complex in a light-dependent manner. Moreover, plants lacking PSB33 show an accelerated D1 protein degradation in nocturnal periods, and show severely stunted growth when challenged with fluctuating light. We further show that the function of PSB33 precedes the STN7 kinase to regulate or balance the excitation energy of photosystems I and II in fluctuating light conditions.

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