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First published online December 17, 2004; 10.1105/tpc.104.028282

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The Plant Cell 17:219-232 (2005)
© 2005 American Society of Plant Biologists

New Subunits NDH-M, -N, and -O, Encoded by Nuclear Genes, Are Essential for Plastid Ndh Complex Functioning in Higher Plants{boxw}

Dominique Rumeaua,1, Noëlle Bécuwe-Linkaa, Audrey Beylya, Mathilde Louwagieb, Jérôme Garinb and Gilles Peltiera

a Commissariat à l'Energie Atomique Cadarache, Direction des Sciences du Vivant, Département d'Ecophysiologie Végétale et de Microbiologie, Laboratoire d'Ecophysiologie de la Photosynthèse, Unité Mixte de Recherche 6191, Centre National de la Recherche Scientifique, Commissariat à l'Energie Atomique, Université de la Méditerranée, 13108 Saint-Paul-lez-Durance, Cedex, France
b Commissariat à l'Energie Atomique Grenoble, Direction des Sciences du Vivant, Département Réponse et Dynamique Cellulaires, Institut National de la Santé et de la Recherche Médicale, ERM 0201, Laboratoire de Chimie des Protéines, 38054 Grenoble 9, France

1 To whom correspondence should be addressed. E-mail dominique.rumeau{at}cea.fr; fax 33-4-42-25-62-65.

In higher plants, the Ndh complex reduces plastoquinones and is involved in cyclic electron flow around photosystem I, supplying extra-ATP for photosynthesis, particularly under environmental stress conditions. Based on plastid genome sequences, the Ndh complex would contain 11 subunits (NDH-A to -K), but homologies with bacterial complex indicate the probable existence of additional subunits. To identify missing subunits, tobacco (Nicotiana tabacum) NDH-H was His tagged at its N terminus using plastid transformation. A functional Ndh subcomplex was purified by Ni2+ affinity chromatography and its subunit composition analyzed by mass spectrometry. Five plastid encoded subunits (NDH-A, -H, -I, -J, and -K) were identified as well as three new subunits (NDH-M, -N, and -O) homologous to cyanobacterial and higher plant proteins. Arabidopsis thaliana mutants missing one of these new subunits lack a functional Ndh complex, and NDH-M and NDH-N are not detected in a tobacco transformant lacking the Ndh complex. We discuss the involvement of these three nuclear-encoded subunits in the functional integrity of the plastidial complex.




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