TLP18.3, a novel thylakoid lumen protein regulating photosystem II repair cycle

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  • Sari Sirpiö
    Department of Biology, Plant Physiology and Molecular Biology, University of Turku, FI-20014 Turku, Finland
  • Yagut Allahverdiyeva
    Department of Biology, Plant Physiology and Molecular Biology, University of Turku, FI-20014 Turku, Finland
  • Marjaana Suorsa
    Department of Biology, Plant Physiology and Molecular Biology, University of Turku, FI-20014 Turku, Finland
  • Virpi Paakkarinen
    Department of Biology, Plant Physiology and Molecular Biology, University of Turku, FI-20014 Turku, Finland
  • Julia Vainonen
    Department of Biology, Plant Physiology and Molecular Biology, University of Turku, FI-20014 Turku, Finland
  • Natalia Battchikova
    Department of Biology, Plant Physiology and Molecular Biology, University of Turku, FI-20014 Turku, Finland
  • Eva-Mari Aro
    Department of Biology, Plant Physiology and Molecular Biology, University of Turku, FI-20014 Turku, Finland

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<jats:p>A proteome analysis of Arabidopsis thaliana thylakoid-associated polysome nascent chain complexes was performed to find novel proteins involved in the biogenesis, maintenance and turnover of thylakoid protein complexes, in particular the PSII (photosystem II) complex, which exhibits a high turnover rate. Four unknown proteins were identified, of which TLP18.3 (thylakoid lumen protein of 18.3 kDa) was selected for further analysis. The Arabidopsis mutants (SALK_109618 and GABI-Kat 459D12) lacking the TLP18.3 protein showed higher susceptibility of PSII to photoinhibition. The increased susceptibility of ΔTLP18.3 plants to high light probably originates from an inefficient reassembly of PSII monomers into dimers in the grana stacks, as well as from an impaired turnover of the D1 protein in stroma exposed thylakoids. Such dual function of the TLP18.3 protein is in accordance with its even distribution between the grana and stroma thylakoids. Notably, the lack of the TLP18.3 protein does not lead to a severe collapse of the PSII complexes, suggesting a redundancy of proteins assisting these particular repair steps to assure functional PSII. The ΔTLP18.3 plants showed no clear visual phenotype under standard growth conditions, but when challenged by fluctuating light during growth, the retarded growth of ΔTLP18.3 plants was evident.</jats:p>

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