Document Detail

Towards understanding the functional difference between the two PsbO isoforms in Arabidopsis thaliana--insights from phenotypic analyses of psbo knockout mutants.
MedLine Citation:
PMID:  18709442     Owner:  NLM     Status:  MEDLINE    
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.
Björn Lundin; Markus Nurmi; Marc Rojas-Stuetz; Eva-Mari Aro; Iwona Adamska; Cornelia Spetea
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-08-16
Journal Detail:
Title:  Photosynthesis research     Volume:  98     ISSN:  0166-8595     ISO Abbreviation:  Photosyn. Res.     Publication Date:    2008 Oct-Dec
Date Detail:
Created Date:  2008-12-10     Completed Date:  2009-03-26     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100954728     Medline TA:  Photosynth Res     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  405-14     Citation Subset:  IM    
Division of Molecular Genetics, Department of Physics, Chemistry and Biology, Linköping University, 58183 Linkoping, Sweden.
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MeSH Terms
Amino Acid Sequence
Arabidopsis / genetics,  growth & development,  metabolism*
Gene Expression Regulation, Plant
Guanosine Triphosphate / metabolism*
Molecular Sequence Data
Photosystem II Protein Complex / genetics,  metabolism*
Protein Isoforms / metabolism
RNA, Plant / metabolism
Stress, Physiological*
Reg. No./Substance:
0/Photosystem II Protein Complex; 0/Protein Isoforms; 0/RNA, Plant; 0/photosystem II manganese-stabilizing protein; 86-01-1/Guanosine Triphosphate

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