title: Cytosolic glyceraldehyde-3-phosphate dehydrogenases interact with phospholipase Dδ to transduce hydrogen peroxide signals in the Arabidopsis response to stress.
abstract: Reactive oxygen species (ROS) are produced in plants under various stress conditions and serve as important mediators in plant responses to stresses. Here, we show that the cytosolic glycolytic enzymes glyceraldehyde-3-phosphate dehydrogenases (GAPCs) interact with the plasma membrane-associated phospholipase D (PLDδ) to transduce the ROS hydrogen peroxide (H(2)O(2)) signal in Arabidopsis thaliana. Genetic ablation of PLDδ impeded stomatal response to abscisic acid (ABA) and H(2)O(2), placing PLDδ downstream of H(2)O(2) in mediating ABA-induced stomatal closure. To determine the molecular link between H(2)O(2) and PLDδ, GAPC1 and GAPC2 were identified to bind to PLDδ, and the interaction was demonstrated by coprecipitation using proteins expressed in Escherichia coli and yeast, surface plasmon resonance, and bimolecular fluorescence complementation. H(2)O(2) promoted the GAPC-PLDδ interaction and PLDδ activity. Knockout of GAPCs decreased ABA- and H(2)O(2)-induced activation of PLD and stomatal sensitivity to ABA. The loss of GAPCs or PLDδ rendered plants less responsive to water deficits than the wild type. The results indicate that the H(2)O(2)-promoted interaction of GAPC and PLDδ may provide a direct connection between membrane lipid-based signaling, energy metabolism and growth control in the plant response to ROS and water stress.
authors.affiliation: Department of Biology, University of Missouri, St. Louis, Missouri 63121, USA.
authors.forename: Liang
authors.initials: L
authors.lastname: Guo
authors.forename: Shivakumar P
authors.initials: SP
authors.lastname: Devaiah
authors.forename: Rama
authors.initials: R
authors.lastname: Narasimhan
authors.forename: Xiangqing
authors.initials: X
authors.lastname: Pan
authors.forename: Yanyan
authors.initials: Y
authors.lastname: Zhang
authors.forename: Wenhua
authors.initials: W
authors.lastname: Zhang
authors.forename: Xuemin
authors.initials: X
authors.lastname: Wang
mesh_terms: D017360:Arabidopsis / Q000187:drug effects / Q000201:enzymology* / Q000235:genetics / Q000378:metabolism*; D003600:Cytosol / Q000187:drug effects / Q000201:enzymology* / Q000378:metabolism; D018506:Gene Expression Regulation, Plant / Q000187:drug effects / Q000235:genetics; D005987:Glyceraldehyde-3-Phosphate Dehydrogenases / Q000235:genetics / Q000378:metabolism*; D006861:Hydrogen Peroxide / Q000494:pharmacology*; D010739:Phospholipase D / Q000235:genetics / Q000378:metabolism*; D030821:Plants, Genetically Modified / Q000187:drug effects / Q000201:enzymology / Q000235:genetics / Q000378:metabolism; D011485:Protein Binding
chemical_list: D006861:Hydrogen Peroxide; D005987:Glyceraldehyde-3-Phosphate Dehydrogenases; C446530:phospholipase D delta; D010739:Phospholipase D