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Plant Physiol, February 2000, Vol. 122, pp. 505-516
Redox Control of psbA Gene Expression
in the Cyanobacterium Synechocystis PCC
6803. Involvement of the Cytochrome b6/f
Complex
Miguel
Alfonso,12
Irène
Perewoska, and
Diana
Kirilovsky*
Unité Mixte de Recherche 8543, Centre National de la
Recherche Scientifique, "Photorégulation et Dynamique des
Membranes Végétales," Ecole Normale Supérieure, 46 rue d'Ulm, 75230 Paris cedex 05, France.
We
investigated the role of the redox state of the photosynthetic and
respiratory electron transport chains on the regulation of
psbA expression in Synechocystis PCC
6803. Different means to modify the redox state of the electron
carriers were used: (a) dark to oxidize the whole electron transport
chain; (b) a shift from dark to light to induce its reduction; (c) the
chemical interruption of the electron flow at different points to
change the redox state of specific electron carriers; and (d) the
presence of glucose to maintain a high reducing power in darkness. We
show that changes in the redox state of the intersystem electron
transport chain induce modifications of psbA transcript
production and psbA mRNA stability. Reduction of the
intersystem electron carriers activates psbA
transcription and destabilizes the mRNA, while their oxidation induces
a decrease in transcription and a stabilization of the transcript.
Furthermore, our data suggest that the redox state of one of the
electron carriers between the plastoquinone pool and photosystem I
influences not only the expression of the psbA gene, but
also that of other two photosynthetic genes, psaE and
cpcBA. As a working hypothesis, we propose that the
occupancy of the Q0 site in the cytochrome
b6/f complex may be involved in this regulation.
1
M.A. was the recipient of a postdoctoral
fellowship from the Departamento de Educación, Universidades e
Investigación, Eusko Jaularitza-Gobierno Vasco.
2
Present address: Departamento de Nutricion
Vegetal, E.E. "Aula Dei," Consejo Superior de Investigaciones
Científicas, Apdo 202, 50080 Zaragoza, Spain.
*
Corresponding author; e-mail kirilov{at}wotan.ens.fr; fax
33-1-44323935.
© 2000 American Society of Plant Physiologists
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