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Redox Control of ntcA Gene Expression in Synechocystis sp. PCC 6803. Nitrogen Availability and Electron Transport Regulate the Levels of the NtcA Protein

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dc.creator Alfonso Lozano, Miguel
dc.creator Perewoska, I.
dc.creator Kirilovsky, D.
dc.date 2008-06-12T07:02:36Z
dc.date 2008-06-12T07:02:36Z
dc.date 2001-02
dc.date.accessioned 2017-01-31T01:39:45Z
dc.date.available 2017-01-31T01:39:45Z
dc.identifier Plant Physiol, February 2001, Vol. 125, pp. 969-981
dc.identifier 0032-0889
dc.identifier http://hdl.handle.net/10261/5008
dc.identifier.uri http://dspace.mediu.edu.my:8181/xmlui/handle/10261/5008
dc.description In this work we have studied the influence of the cellular redox status in the expression of the Synechocystis sp. PCC 6803 ntcA gene. Two different ntcA transcripts with different 5' ends were detected, depending on the different dark/light or nitrogen availability conditions. Accumulation of a 0.8-kb ntcA message was light and nitrogen dependent, whereas a longer 1.2-kb ntcA transcript was neither light nor nitrogen regulated. NtcA protein levels increased concomitantly with the accumulation of the 0.8-kb ntcA transcript. The light-dependent accumulation of the ntcA gene and the NtcA protein was sensitive to electron transport inhibitors. In addition, Glc-grown Synechocystis sp. cells showed a similar ntcA expression pattern in darkness to that observed under illumination. These data suggested that electron transport, and not light per se may regulate ntcA gene expression. Primer extension analysis, together with gel mobility-shift assays, demonstrated that in vitro, the Synechocystis sp. NtcA protein specifically bound to the putative promoter region from the light/nitrogen-dependent ntcA transcript but not to that from the constitutive 1.2-kb ntcA mRNA. Band-shift experiments carried out in the presence of thiol oxidizing/modifiying agents and different reducing/oxidizing conditions suggested that NtcA binding to its own promoter was under a thiol-dependent redox mechanism. Our results suggest that the cellular redox status plays a central role in the autoregulatory mechanism of the NtcA protein.
dc.description This work was supported by grants from the Spanish Ministry of Education (no. PB98-1632 to M.A.) and the Centre National de la Recherche Scientifique (to D.K.). M.A. is recipient of a Postdoctoral Contract from Ministerio de Educación y Cultura.
dc.description Peer reviewed
dc.format 21358 bytes
dc.format application/pdf
dc.language eng
dc.publisher American Society of Plant Biologists
dc.rights openAccess
dc.title Redox Control of ntcA Gene Expression in Synechocystis sp. PCC 6803. Nitrogen Availability and Electron Transport Regulate the Levels of the NtcA Protein
dc.type Artículo


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