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

Photosynthesis Research
Björn LundinCornelia Spetea

Abstract

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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Citations

Feb 19, 2013·Photosynthesis Research·Cristina PaglianoJames Barber
May 28, 2013·Photosynthesis Research·Raúl E Castillo-MedinaMarco A Villanueva
Mar 1, 2011·Journal of Photochemistry and Photobiology. B, Biology·Terry M Bricker, Laurie K Frankel
Mar 5, 2011·Plant Physiology and Biochemistry : PPB·Jorge MarquésJosé-Antonio Daròs
May 23, 2015·Molecular Plant·Mayank Anand GururaniLam Son Phan Tran
Aug 2, 2011·Biochimica Et Biophysica Acta·Terry M BrickerJulian J Eaton-Rye
Jun 30, 2010·Communicative & Integrative Biology·Cornelia Spetea, Benoît Schoefs
Jun 3, 2009·Biochimica Et Biophysica Acta·Yagut AllahverdiyevaEva-Mari Aro
Mar 27, 2010·Annals of Botany·Peter J NixonJosef Komenda
Feb 9, 2017·Frontiers in Plant Science·Jochen BeckDietmar Funck
Jul 15, 2009·Electrophoresis·Daniela CecconiMassimo Delledonne

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