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Efficient Operation of NAD(P)H Dehydrogenase Requires Supercomplex Formation with Photosystem I via Minor LHCI in Arabidopsis[W]

Identifieur interne : 001D79 ( Main/Exploration ); précédent : 001D78; suivant : 001D80

Efficient Operation of NAD(P)H Dehydrogenase Requires Supercomplex Formation with Photosystem I via Minor LHCI in Arabidopsis[W]

Auteurs : Lianwei Peng [Japon] ; Yoichiro Fukao [Japon] ; Masayuki Fujiwara [Japon] ; Tsuneaki Takami [Japon] ; Toshiharu Shikanai [Japon]

Source :

The Plant Cell [ 1040-4651 ] ; 2009.

RBID : PMC:2798312

Abstract

In higher plants, the chloroplast NAD(P)H dehydrogenase (NDH) complex mediates photosystem I (PSI) cyclic and chlororespiratory electron transport. We reported previously that NDH interacts with the PSI complex to form a supercomplex (NDH-PSI). In this study, NDH18 and FKBP16-2 (FK506 Binding Protein 16-2), detected in the NDH-PSI supercomplex by mass spectrometry, were shown to be NDH subunits by the analysis of their knockdown lines. On the basis of extensive mutant characterization, we propose a structural model for chloroplast NDH, whereby NDH is divided into four subcomplexes. The subcomplex A and membrane subcomplex are conserved in cyanobacteria, but the subcomplex B and lumen subcomplex are specific to chloroplasts. Two minor light-harvesting complex I proteins, Lhca5 and Lhca6, were required for the full-size NDH-PSI supercomplex formation. Similar to crr pgr5 double mutants that completely lack cyclic electron flow activity around PSI, the lhca6 pgr5 double mutant exhibited a severe defect in growth. Consistent with the impaired NDH activity, photosynthesis was also severely affected in mature leaves of lhca6 pgr5. We conclude that chloroplast NDH became equipped with the novel subcomplexes and became associated with PSI during the evolution of land plants, and this process may have facilitated the efficient operation of NDH.

Url:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2798312

DOI: 10.1105/tpc.109.068791
PubMed: 19903870
PubMed Central: 2798312

Affiliations:

Le document en format XML

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<front><div type="abstract" xml:lang="en"><p>In higher plants, the chloroplast NAD(P)H dehydrogenase (NDH) complex mediates photosystem I (PSI) cyclic and chlororespiratory electron transport. We reported previously that NDH interacts with the PSI complex to form a supercomplex (NDH-PSI). In this study, NDH18 and FKBP16-2 (FK506 Binding Protein 16-2), detected in the NDH-PSI supercomplex by mass spectrometry, were shown to be NDH subunits by the analysis of their knockdown lines. On the basis of extensive mutant characterization, we propose a structural model for chloroplast NDH, whereby NDH is divided into four subcomplexes. The subcomplex A and membrane subcomplex are conserved in cyanobacteria, but the subcomplex B and lumen subcomplex are specific to chloroplasts. Two minor light-harvesting complex I proteins, Lhca5 and Lhca6, were required for the full-size NDH-PSI supercomplex formation. Similar to <italic>crr pgr5</italic>
 double mutants that completely lack cyclic electron flow activity around PSI, the <italic>lhca6 pgr5</italic>
 double mutant exhibited a severe defect in growth. Consistent with the impaired NDH activity, photosynthesis was also severely affected in mature leaves of <italic>lhca6 pgr5</italic>
. We conclude that chloroplast NDH became equipped with the novel subcomplexes and became associated with PSI during the evolution of land plants, and this process may have facilitated the efficient operation of NDH.</p>
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Efficient Operation of NAD(P)H Dehydrogenase Requires Supercomplex Formation with Photosystem I via Minor LHCI in Arabidopsis[W]

Efficient Operation of NAD(P)H Dehydrogenase Requires Supercomplex Formation with Photosystem I via Minor LHCI in Arabidopsis[W]

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Abstract

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