title: Functional differentiation of endosomes in Arabidopsis cells.
abstract: Endocytosis plays an important role in plant physiology, but how endocytic organelles are organized remains unknown. We present the evidence that endosomes are functionally differentiated in Arabidopsis cells. Two types of Rab5-related GTPases are localized on distinct population of endosomes in a partially overlapping manner. Ara7 and Rha1 are on an early type of endosomes with AtVamp727, where recycling of plasma membrane proteins occurs. In contrast, the plant-unique Rab5, Ara6, resides on distinct endosomes with the prevacuolar SNAREs. Partially overlapping localization of Ara6 and Ara7/Rha1 with reciprocal gradients suggests maturation of endosomes from one to the other.
authors.affiliation: Department of Biological Sciences, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan. tueda@biol.s.u-tokyo.ac.jp
authors.forename: Takashi
authors.initials: T
authors.lastname: Ueda
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Uemura
authors.forename: Masa H
authors.initials: MH
authors.lastname: Sato
authors.forename: Akihiko
authors.initials: A
authors.lastname: Nakano
mesh_terms: D017360:Arabidopsis / Q000378:metabolism / Q000648:ultrastructure*; D029681:Arabidopsis Proteins / Q000378:metabolism; D002478:Cells, Cultured; D011992:Endosomes / Q000378:metabolism*; D020558:GTP Phosphohydrolases / Q000737:chemistry / Q000378:metabolism; D018506:Gene Expression Regulation, Plant; D018613:Microscopy, Confocal; D020691:rab GTP-Binding Proteins / Q000378:metabolism
chemical_list: D029681:Arabidopsis Proteins; C081080:Rha1 protein, Arabidopsis; C436706:Ara6 protein, Arabidopsis; C495672:Ara7 protein, Arabidopsis; D020558:GTP Phosphohydrolases; D020691:rab GTP-Binding Proteins