Chlororespiratory reduction 6 is a novel factor required for accumulation of the chloroplast NAD(P)H dehydrogenase complex in Arabidopsis.

Plant Physiology
M Kamruzzaman MunshiToshiharu Shikanai

Abstract

The chloroplast NAD(P)H dehydrogenase (NDH) complex is involved in photosystem I cyclic electron transport and chlororespiration in higher plants. An Arabidopsis (Arabidopsis thaliana) chlororespiratory reduction 6 (crr6) mutant lacking NDH activity was identified by means of chlorophyll fluorescence imaging. Accumulation of the NDH complex was impaired in crr6. Physiological characterization of photosynthetic electron transport indicated the specific defect of the NDH complex in crr6. In contrast to the CRR7 protein that was recently identified as a potential novel subunit of the NDH complex by means of the same screening, the CRR6 protein was stable under the crr2 mutant background in which the NDH complex does not accumulate. The CRR6 gene (At2g47910) encodes a novel protein without any known motif. Although CRR6 does not have any transmembrane domains, it is localized in the thylakoid membrane fraction of the chloroplast. CRR6 is conserved in phototrophs, including cyanobacteria, from which the chloroplast NDH complex has evolutionally originated, but not in Chlamydomonas reinhardtii, in which the NDH complex is absent. We believe that CRR6 is a novel specific factor for the assembly or stabilization of the NDH complex.

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Citations

Feb 7, 2007·Photosynthesis Research·Teruo Ogawa, Hualing Mi
Sep 16, 2008·Photosynthesis Research·Kentaro IfukuFumihiko Sato
Oct 16, 2008·The Journal of Biological Chemistry·Lianwei PengToshiharu Shikanai
May 6, 2008·Molecular & Cellular Proteomics : MCP·Wojciech MajeranKlaas J van Wijk
Jan 5, 2007·Annual Review of Plant Biology·Toshiharu Shikanai
Jan 24, 2009·Trends in Plant Science·Wojciech Majeran, Klaas J van Wijk
Aug 31, 2007·The Plant Journal : for Cell and Molecular Biology·Hideyuki Shimizu, Toshiharu Shikanai
Sep 13, 2008·The Plant Journal : for Cell and Molecular Biology·Atsushi TakabayashiFumihiko Sato
Jul 31, 2007·Plant, Cell & Environment·Dominique RumeauLaurent Cournac
May 7, 2010·The Plant Journal : for Cell and Molecular Biology·Lianwei PengToshiharu Shikanai
Dec 10, 2009·Molecular Plant·Marjaana SuorsaEva-Mari Aro
Oct 7, 2010·Molecular Plant·Ute ArmbrusterDario Leister
Oct 30, 2010·Biochimica Et Biophysica Acta·Lianwei PengToshiharu Shikanai
Nov 1, 2008·The Journal of Biological Chemistry·Sari SirpiöEva-Mari Aro
Jun 27, 2014·Protoplasma·Martin H SchattatJaideep Mathur
Apr 5, 2007·The Journal of Biological Chemistry·Hiroaki YamasakiMarinus Pilon

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