title: Uncoupling of the functions of the Arabidopsis VIP1 protein in transient and stable plant genetic transformation by Agrobacterium.
abstract: Agrobacterium-mediated genetic transformation of plants, a unique example of transkingdom DNA transfer, requires the presence of several proteins encoded by the host cell. One such cellular factor is VIP1, an Arabidopsis protein proposed to interact with and facilitate import of the bacterial DNA-protein transport (T) complexes into the plant cell nucleus. Thus, VIP1 is required for transient expression of the bacterial DNA, an early step in the transformation process. However, the role of VIP1 in subsequent transformation events leading to the stable expression of bacterial DNA was unexplored. Here, we used reverse genetics to dissect VIP1 functionally and demonstrate its involvement in the stable genetic transformation of Arabidopsis plants by Agrobacterium. Our data indicate that the ability of VIP1 to interact with the VirE2 protein component of the T-complex and localize to the cell nucleus is sufficient for transient genetic transformation, whereas its ability to form homomultimers and interact with the host cell H2A histone in planta is required for tumorigenesis and, by implication, stable genetic transformation.
authors.affiliation: Department of Biochemistry and Cell Biology, State University of New York, Stony Brook, NY 11794-5215, USA.
authors.forename: Jianxiong
authors.initials: J
authors.lastname: Li
authors.forename: Alexander
authors.initials: A
authors.lastname: Krichevsky
authors.forename: Manjusha
authors.initials: M
authors.lastname: Vaidya
authors.forename: Tzvi
authors.initials: T
authors.lastname: Tzfira
authors.forename: Vitaly
authors.initials: V
authors.lastname: Citovsky
mesh_terms: D021581:Active Transport, Cell Nucleus; D000595:Amino Acid Sequence; D000818:Animals; D017360:Arabidopsis / Q000235:genetics / Q000378:metabolism; D029681:Arabidopsis Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism*; D001483:Base Sequence; D002467:Cell Nucleus / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D005816:Genetic Complementation Test; D007473:Ion Channels / Q000235:genetics / Q000378:metabolism*; D008164:Luminescent Proteins / Q000235:genetics / Q000378:metabolism; D008969:Molecular Sequence Data; D046912:Multiprotein Complexes; D010641:Phenotype; D020836:Protein Structure, Quaternary; D012231:Rhizobium / Q000235:genetics* / Q000378:metabolism; D014170:Transformation, Genetic
chemical_list: D029681:Arabidopsis Proteins; D001426:Bacterial Proteins; D004268:DNA-Binding Proteins; D007473:Ion Channels; D008164:Luminescent Proteins; D046912:Multiprotein Complexes; C432104:VIP1 protein, Arabidopsis; C051583:virE2 protein, Agrobacterium