title: Selective trafficking of non-cell-autonomous proteins mediated by NtNCAPP1.
abstract: In plants, cell-to-cell communication is mediated by plasmodesmata and involves the trafficking of non-cell-autonomous proteins (NCAPs). A component in this pathway, Nicotiana tabacum NON-CELL-AUTONOMOUS PATHWAY PROTEIN1 (NtNCAPP1), was affinity purified and cloned. Protein overlay assays and in vivo studies showed that NtNCAPP1 is located on the endoplasmic reticulum at the cell periphery and displays specificity in its interaction with NCAPs. Deletion of the NtNCAPP1 amino-terminal transmembrane domain produced a dominant-negative mutant that blocked the trafficking of specific NCAPs. Transgenic tobacco plants expressing this mutant form of NtNCAPP1 and plants in which the NtNCAPP1 gene was silenced were compromised in their ability to regulate leaf and floral development. These results support a model in which NCAP delivery to plasmodesmata is both selective and regulated.
authors.affiliation: Section of Plant Biology, Division of Biological Sciences, University of California, 1 Shields Avenue, Davis, CA 95616, USA.
authors.forename: Jung-Youn
authors.initials: JY
authors.lastname: Lee
authors.forename: Byung-Chun
authors.initials: BC
authors.lastname: Yoo
authors.forename: Maria R
authors.initials: MR
authors.lastname: Rojas
authors.forename: Natalia
authors.initials: N
authors.lastname: Gomez-Ospina
authors.forename: L Andrew
authors.initials: LA
authors.lastname: Staehelin
authors.forename: William J
authors.initials: WJ
authors.lastname: Lucas
mesh_terms: D000595:Amino Acid Sequence; D002450:Cell Communication; D002460:Cell Line; D003001:Cloning, Molecular; D003593:Cytoplasm / Q000378:metabolism; D004721:Endoplasmic Reticulum / Q000378:metabolism; D035264:Flowers / Q000254:growth & development; D020868:Gene Silencing; D049452:Green Fluorescent Proteins; D007150:Immunohistochemistry; D008164:Luminescent Proteins / Q000378:metabolism; D008969:Molecular Sequence Data; D009154:Mutation; D010641:Phenotype; D018515:Plant Leaves / Q000254:growth & development; D010940:Plant Proteins / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism*; D030821:Plants, Genetically Modified; D031425:Plasmodesmata / Q000378:metabolism*; D021381:Protein Transport; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D014026:Nicotiana / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D014027:Tobacco Mosaic Virus; D014764:Viral Proteins / Q000378:metabolism
chemical_list: D008164:Luminescent Proteins; C116564:PP16 protein, Cucurbita maxima; D010940:Plant Proteins; D011993:Recombinant Fusion Proteins; D014764:Viral Proteins; D049452:Green Fluorescent Proteins