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Chloroplastic phosphoadenosine phosphosulfate metabolism regulates basal levels of the prohormone jasmonic acid in Arabidopsis leaves

AutorRodríguez Graña, Víctor Manuel ; Chételat, Aurore; Majcherczyk, Paul; Farmer, Edward E.
Palabras claveJasmonic acid
Chloroplastic synthesis
Adenosine phosphosulfate
Arabidopsis thaliana
Fecha de publicaciónmar-2010
EditorAmerican Society of Plant Biologists
CitaciónPlant Physiology, 2010, Vol. 152, pp. 1335–1345
ResumenLevels of the enzymes that produce wound response mediators have to be controlled tightly in unwounded tissues. The Arabidopsis (Arabidopsis thaliana) fatty acid oxygenation up-regulated8 (fou8) mutant catalyzes high rates of a-linolenic acid oxygenation and has higher than wild-type levels of the a-linolenic acid-derived wound response mediator jasmonic acid (JA) in undamaged leaves. fou8 produces a null allele in the gene SAL1 (also known as FIERY1 or FRY1). Overexpression of the wild-type gene product had the opposite effect of the null allele, suggesting a regulatory role of SAL1 acting in JA synthesis. The biochemical phenotypes in fou8 were complemented when the yeast (Saccharomyces cerevisiae) sulfur metabolism 3'(2'), 5'-bisphosphate nucleotidase MET22 was targeted to chloroplasts in fou8. The data are consistent with a role of SAL1 in the chloroplast-localized dephosphorylation of 3'-phospho-5'-adenosine phosphosulfate to 5'-adenosine phosphosulfate or in a closely related reaction(e.g.3',5'-bisphosphate dephosphorylation). Furthermore, the fou8phenotype was genetically suppressed in a triple mutant (fou8 apk1 apk2) affecting chloroplastic 3'-phospho-5'-adenosine phosphosulfate synthesis. These results show that a nucleotide component of the sulfur futile cycle regulates early steps of JA production and basal JA levels. © 2010 American Society of Plant Biologists.
Versión del editorhttp://dx.doi.org/10.1104/pp.109.150474
URIhttp://hdl.handle.net/10261/23119
DOI10.1104/pp.109.150474
ISSN0032-0889
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