Published online 20 October 2005
Article |
Specific function of a plastid sigma factor for ndhF gene transcription
Laboratoire Plastes et différenciation cellulaire, Université Joseph Fourier and Centre National de la Recherche Scientifique B.P. 53, 38041 Grenoble, France 1Laboratory of Molecular Genetics, Department of Molecular Biology, Institute of Molecular and Cellular Biosciences, The University of Tokyo 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan 2CEA Cadarache, Direction des Sciences du Vivant, Laboratoire d'Ecophysiologie de la Photosynthèse, Département d'Ecophysiologie Végétale et de Microbiologie, Unité Mixte de Recherche 6191 CNRS-CEA-Université de la Méditerranée 13 108 Saint Paul lez Durance, France 3Institut de Biotechnologie des Plantes, Université de Paris Sud 91405 Orsay, France
*To whom correspondence should be addressed. Tel: +33 04 76 63 57 44; Fax: +33 04 76 63 55 86; Email: Silva.Lerbs-Mache{at}ujf-grenoble.fr
Received July 25, 2005. Revised September 30, 2005. Accepted September 30, 2005.
The complexity of the plastid transcriptional apparatus (two or three different RNA polymerases and numerous regulatory proteins) makes it very difficult to attribute specific function(s) to its individual components. We have characterized an Arabidopsis T-DNA insertion line disrupting the nuclear gene coding for one of the six plastid sigma factors (SIG4) that regulate the activity of the plastid-encoded RNA polymerase PEP. This mutant shows a specific diminution of transcription of the plastid ndhF gene, coding for a subunit of the plastid NDH [NAD(P)H dehydrogenase] complex. The absence of another NDH subunit, i.e. NDHH, and the absence of a chlorophyll fluorescence transient previously attributed to the activity of the plastid NDH complex indicate a strong down-regulation of NDH activity in the mutant plants. Results suggest that plastid NDH activity is regulated on the transcriptional level by an ndhF-specific plastid sigma factor, SIG4.
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