title: An extraction method for tobacco mosaic virus movement protein localizing in plasmodesmata.
abstract: The intercellular communication by plasmodesmata (PD) is important for the growth and development of plants, and the transport of macromolecules through PD is likely to be regulated by developmental signals. While PD in the apical meristem transport macromolecules such as mRNAs, the branched PD in the mature leaf do not transport large macromolecules freely. The changes in PD during development might be important for sink-to-source changes in leaves, but the molecular mechanism is still unknown. Movement proteins (MPs) of the tobacco mosaic virus localize in the branched PD and increase the size exclusion limit, allowing transport of viral RNA. We developed a method for differential extraction of MP from isolated cell walls of transgenic tobacco leaves expressing MP or MP tagged with green-fluorescent protein. Lithium chloride at a concentration of 8 M removed filamentous structures in branched PD, the possible attachment site of MP. As some endogenous proteins were coeluted with MP by the treatment, this extraction method might be a powerful tool for investigating MP-interacting proteins in branched PD.
authors.affiliation: Department of Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, Tokyo, Japan.
authors.forename: Mitsuko
authors.initials: M
authors.lastname: Kishi-Kaboshi
authors.forename: Takashi
authors.initials: T
authors.lastname: Murata
authors.forename: Mitsuyasu
authors.initials: M
authors.lastname: Hasebe
authors.forename: Yuichiro
authors.initials: Y
authors.lastname: Watanabe
mesh_terms: D049452:Green Fluorescent Proteins / Q000235:genetics / Q000302:isolation & purification; D018021:Lithium Chloride; D008854:Microscopy, Electron; D053830:Plant Viral Movement Proteins; D030821:Plants, Genetically Modified; D031425:Plasmodesmata / Q000737:chemistry; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000302:isolation & purification; D014026:Nicotiana / Q000737:chemistry / Q000235:genetics / Q000648:ultrastructure / Q000821:virology; D014027:Tobacco Mosaic Virus / Q000737:chemistry* / Q000235:genetics; D014764:Viral Proteins / Q000235:genetics / Q000302:isolation & purification*
chemical_list: D053830:Plant Viral Movement Proteins; D011993:Recombinant Fusion Proteins; D014764:Viral Proteins; D049452:Green Fluorescent Proteins; D018021:Lithium Chloride