A mutation in the Proteosomal Regulatory Particle AAA-ATPase-3 in Arabidopsis impairs the light-specific hypocotyl elongation response elicited by a glutamate receptor agonist, BMAA
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BMAA is a cycad-derived glutamate receptor agonist that causes a two- to three-fold increase in hypocotyl elongation on Arabidopsis seedlings grown in the light. To probe the role of plant glutamate receptors and their downstream mediators, we utilized a previously described genetic screen to identify a novel, BMAA insensitive morphology (bim) mutant, bim409. The normal BMAA-induced hypocotyl elongation response observed on wild-type seedlings grown in the light is impaired in the bim409 mutant. This BMAA-induced phenotype is light-specific, as the bim409 mutant exhibits normal hypocotyl elongation in etiolated (dark grown) plants (+ or − BMAA). The mutation in bim409 was identified to be in a gene encoding the Proteosomal Regulatory Particle AAA-ATPase-3 (RPT3). Possible roles of the proteosome in Glu-mediated signaling in plants is discussed.
KeywordsGlutamate receptors Proteasome BMAA Hypocotyl elongation
We would like to thank Rachel Dunmeyer and Soojin Ahn for their helpful assistance in the lab. We would like to thank Richard Bonneau (NYU Center for Genomics & Systems Biology) for providing an in silico prediction of the Arabidopsis rpt3-1 3D structure. We would also like to express gratitude to Prof. Danny Chamovitz for his helpful comments on this article and insights into this project. This work was supported in part by NIH Grant GM032877 to GC and the Lowenstein and Ambrose Monell Foundations to The New York Botanical Garden.
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