title: The acceptor availability at photosystem I and ABA control nuclear expression of 2-Cys peroxiredoxin-A in Arabidopsis thaliana.
abstract: The redox-regulated 2-Cys peroxiredoxin-A (2CPA) promoter, which drives expression of a dominant chloroplast antioxidant enzyme, responds to signals originating from the photosynthetic electron transport downstream of PSI. Modulation of CO(2)- and NO(3)(-) -reduction rates in reporter gene plants expressing glucuronidase under control of the Arabidopsis thaliana 2CPA promoter revealed that promoter activity correlates with the availability of electron acceptors at PSI. The photosynthetic redox-regulation can be simulated by oxidant and antioxidant treatments. Inhibitor studies with PD98059 and staurosporine showed that a mitogen-activated protein kinase kinase transmits the oxidative response, while the antioxidant signal is transmitted by a serine/threonine kinase. Analysis of 2CPA promoter regulation in the abscisic acid (ABA)-biosynthetic mutants aba2 and aba3 and the ABA-insensitive mutants abi1 and abi2 support a regulatory circuitry in which the redox signal cross-talks with the ABA-signaling cascade downstream of ABI1 and ABI2.
authors.affiliation: University of Bielefeld, D-33501 Bielefeld, Germany. margarete.baier@uni-bielefeld.de
authors.forename: Margarete
authors.initials: M
authors.lastname: Baier
authors.forename: Elke
authors.initials: E
authors.lastname: Ströher
authors.forename: Karl-Josef
authors.initials: KJ
authors.lastname: Dietz
mesh_terms: D000040:Abscisic Acid / Q000378:metabolism*; D017360:Arabidopsis / Q000187:drug effects / Q000235:genetics / Q000378:metabolism*; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism; D002245:Carbon Dioxide / Q000378:metabolism; D002467:Cell Nucleus / Q000235:genetics / Q000378:metabolism*; D004579:Electron Transport / Q000187:drug effects / Q000235:genetics; D004791:Enzyme Inhibitors / Q000494:pharmacology; D018506:Gene Expression Regulation, Plant / Q000187:drug effects / Q000235:genetics; D020935:MAP Kinase Signaling System / Q000187:drug effects / Q000235:genetics; D009154:Mutation / Q000235:genetics; D009573:Nitrites / Q000378:metabolism; D010084:Oxidation-Reduction / Q000187:drug effects; D010544:Peroxidases / Q000235:genetics / Q000378:metabolism*; D054464:Peroxiredoxins; D010788:Photosynthesis / Q000187:drug effects / Q000235:genetics*; D045331:Photosystem I Protein Complex / Q000187:drug effects / Q000235:genetics / Q000378:metabolism*; D011401:Promoter Regions, Genetic / Q000187:drug effects / Q000235:genetics; D017346:Protein Serine-Threonine Kinases / Q000187:drug effects / Q000378:metabolism
chemical_list: D029681:Arabidopsis Proteins; D004791:Enzyme Inhibitors; D009573:Nitrites; D045331:Photosystem I Protein Complex; D002245:Carbon Dioxide; D000040:Abscisic Acid; D010544:Peroxidases; C493631:2-Cys peroxiredoxin A, Arabidopsis; D054464:Peroxiredoxins; D017346:Protein Serine-Threonine Kinases