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Towards understanding the functional difference between the two PsbO isoforms in Arabidopsis thaliana-insights from phenotypic analyses of psbo knockout mutants

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2008

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Lundin, Björn
Nurmi, Markus
Rojas-Stuetz, Marc
Aro, Eva-Mari
Spetea, Cornelia

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http://nbn-resolving.de/urn:nbn:de:bsz:352-opus-111496
DOI (zitierfähiger Link)
https://doi.org/10.1007/s11120-008-9325-y
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Photosynthesis Research. 2008, 98(1-3), pp. 405-414. ISSN 0166-8595. eISSN 1573-5079. Available under: doi: 10.1007/s11120-008-9325-y

Zusammenfassung

The extrinsic PsbO subunit of the water-oxidizing photosystem II (PSII) complex is represented by two isoforms in Arabidopsis thaliana, namely PsbO1 and PsbO2. Recent analyses of psbo1 and psbo2 knockout mutants have brought insights into their roles in photosynthesis and light stress. Here we analyzed the two psbo mutants in terms of PsbOs expression pattern, organization of PSII complexes and GTPase activity. Both PsbOs are present in wild-type plants, and their expression is mutually controlled in the mutants. Almost all PSII complexes are in the monomeric form not only in the psbo1 but also in the psbo2 mutant grown under high-light conditions. This results either from an enhanced susceptibility of PSII to photoinactivation or from malfunction of the repair cycle. Notably, the psbo1 mutant displays such problems even under growth-light conditions. These results together with the finding that PsbO2 has a threefold higher GTPase activity than PsbO1 have significance for the turnover of the PSII D1 subunit in Arabidopsis.

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Fachgebiet (DDC)
570 Biowissenschaften, Biologie

Schlagwörter

Arabidopsis thaliana, Blue Native gel electrophoresis, D1 protein turnover, GTPase, High-light stress, Photosystem II organization, PsbO protein

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ISO 690LUNDIN, Björn, Markus NURMI, Marc ROJAS-STUETZ, Eva-Mari ARO, Iwona ADAMSKA, Cornelia SPETEA, 2008. Towards understanding the functional difference between the two PsbO isoforms in Arabidopsis thaliana-insights from phenotypic analyses of psbo knockout mutants. In: Photosynthesis Research. 2008, 98(1-3), pp. 405-414. ISSN 0166-8595. eISSN 1573-5079. Available under: doi: 10.1007/s11120-008-9325-y
BibTex
@article{Lundin2008Towar-1186,
  year={2008},
  doi={10.1007/s11120-008-9325-y},
  title={Towards understanding the functional difference between the two PsbO isoforms in Arabidopsis thaliana-insights from phenotypic analyses of psbo knockout mutants},
  number={1-3},
  volume={98},
  issn={0166-8595},
  journal={Photosynthesis Research},
  pages={405--414},
  author={Lundin, Björn and Nurmi, Markus and Rojas-Stuetz, Marc and Aro, Eva-Mari and Adamska, Iwona and Spetea, Cornelia}
}
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