The retromer protein VPS29 links cell polarity and organ initiation in plants.
A key feature of plants (as opposed to animals) is their ability to establish new organs not only during embryogenesis, but also throughout their development. A master regulator of organ initiation in plants is the phytohormone auxin. Auxin acts locally as a morphogen and is directionally transported from cell to cell by polarized auxin efflux carriers, termed PIN-FORMED (PIN) proteins. Here we report that the Arabidopsis ortholog of the yeast and mammalian vacuolar protein sorting 29 (VPS29), a member of the retromer complex, mediates the formation of new axes of development. Furthermore, we show that VPS29 is required for endosome homeostasis, PIN protein cycling, and dynamic PIN1 repolarization during development. We propose a model that links VPS29 function, PIN1 polarity, and organ initiation in plants.
Jaillais
Yvon
Y
Reproduction et Développement des Plantes, Institut Fédératif de Recherche 128, Centre National de la Recherche Scientifique, Institut National de la Recherche Agronomique, Université Claude Bernard Lyon I, Ecole Normale Supérieure de Lyon, Lyon, France.
Santambrogio
Martina
M
Rozier
Frédérique
F
Fobis-Loisy
Isabelle
I
Miège
Christine
C
Gaude
Thierry
T
D017360:Arabidopsis / Q000196:embryology / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D002352:Carrier Proteins / Q000378:metabolism; D002454:Cell Differentiation; D016764:Cell Polarity; D049109:Cell Proliferation; D018548:Cotyledon / Q000378:metabolism; D011992:Endosomes / Q000378:metabolism; D005838:Genotype; D020662:Guanine Nucleotide Exchange Factors / Q000378:metabolism; D007210:Indoleacetic Acids / Q000378:metabolism*; D026901:Membrane Transport Proteins / Q000235:genetics / Q000378:metabolism*; D018519:Meristem / Q000196:embryology / Q000378:metabolism; D046912:Multiprotein Complexes / Q000378:metabolism; D009154:Mutation; D010641:Phenotype; D030821:Plants, Genetically Modified / Q000196:embryology / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D021381:Protein Transport; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D015398:Signal Transduction; D058305:Sorting Nexins; D033921:Vesicular Transport Proteins / Q000235:genetics / Q000378:metabolism*; D052584:Xylem / Q000378:metabolism
D029681:Arabidopsis Proteins; D002352:Carrier Proteins; D020662:Guanine Nucleotide Exchange Factors; D007210:Indoleacetic Acids; D026901:Membrane Transport Proteins; D046912:Multiprotein Complexes; D011993:Recombinant Fusion Proteins; D058305:Sorting Nexins; D033921:Vesicular Transport Proteins; C088087:GNOM protein, Arabidopsis; C515611:Mag1 protein, Arabidopsis; C116363:PIN1 protein, Arabidopsis; C117013:AT5G57090 protein, Arabidopsis