title: Plant proton pumps.
abstract: Chemiosmotic circuits of plant cells are driven by proton (H(+)) gradients that mediate secondary active transport of compounds across plasma and endosomal membranes. Furthermore, regulation of endosomal acidification is critical for endocytic and secretory pathways. For plants to react to their constantly changing environments and at the same time maintain optimal metabolic conditions, the expression, activity and interplay of the pumps generating these H(+) gradients have to be tightly regulated. In this review, we will highlight results on the regulation, localization and physiological roles of these H(+)- pumps, namely the plasma membrane H(+)-ATPase, the vacuolar H(+)-ATPase and the vacuolar H(+)-PPase.
authors.affiliation: University of Connecticut, 1390 Storrs Road, U-163, Storrs, CT 06269-4163, USA. roberto.gaxiola@uconn.edu
authors.forename: Roberto A
authors.initials: RA
authors.lastname: Gaxiola
authors.forename: Michael G
authors.initials: MG
authors.lastname: Palmgren
authors.forename: Karin
authors.initials: K
authors.lastname: Schumacher
mesh_terms: D001693:Biological Transport, Active; D001709:Biotechnology; D002462:Cell Membrane / Q000378:metabolism; D015870:Gene Expression; D017343:Genes, Plant; D043564:Inorganic Pyrophosphatase / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D008954:Models, Biological; D008958:Models, Molecular; D009154:Mutation; D063245:Plant Development; D010940:Plant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D010944:Plants / Q000235:genetics / Q000378:metabolism*; D011499:Protein Processing, Post-Translational; D017494:Proton Pumps / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D006180:Proton-Translocating ATPases / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D015398:Signal Transduction; D025262:Vacuolar Proton-Translocating ATPases / Q000737:chemistry / Q000235:genetics / Q000378:metabolism
chemical_list: D010940:Plant Proteins; D017494:Proton Pumps; D025262:Vacuolar Proton-Translocating ATPases; D043564:Inorganic Pyrophosphatase; D006180:Proton-Translocating ATPases