Plant Physiology Preview
Published on April 28, 2006; 10.1104/pp.106.080267
Received March 14, 2006
Returned for revision April 4, 2006
Accepted April 18, 2006
CRR6 is a Novel Factor Required for accumulation of the Chloroplast NAD(P)H Dehydrogenase Complex in Arabidopsis
M. Kamruzzaman Munshi , Yoshichika Kobayashi , and Toshiharu Shikanai *
Graduate School of Agriculture, Kyushu University 6-10-1 Hakozaki, Higashiku, Fukuoka, Japan 812-8581
* Corresponding author; email: shikanai{at}agr.kyushu-u.ac.jp.
The chloroplast NAD(P)H dehydrogenase (NDH) complex is involved in photosystem I cyclic electron transport and chlororespiration in higher plants. An Arabidopsis thaliana crr6 (chlororespiratory reduction) 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 (Munshi et al., 2005), 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 trans-membrane domains, it is localized in the thylakoid membrane fraction of the chloroplast. CRR6 are 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 NDH complex.
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