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Gene Review

virG  -  vir operon transcriptional activator

Agrobacterium fabrum str. C58

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Disease relevance of virG


High impact information on virG


Chemical compound and disease context of virG


Biological context of virG


Anatomical context of virG


Associations of virG with chemical compounds

  • This attracts Ti-plasmid harbouring A. tumefaciens to wound sites, where the higher acetosyringone concentrations lead to virA and virG-mediated induction of the vir-genes [10].
  • Multiple copies of virG genes contained in A. tumefaciens strains harboring a nopaline-type Ti-plasmid had a smaller enhancing effect upon the transformation of celery tissues, and no enhancing effect upon the transformation of rice [11].
  • Additional copies of octopine- and agropine-type virG genes in A. tumefaciens strains containing an agropine-type Ti-plasmid enhanced the frequency of transient transformation of celery and rice [11].
  • Since the trp promoter is not under virA-virG control, this result indicates that modification of VirG is necessary for its full activity [8].

Other interactions of virG


  1. Nucleotide sequence of the virG locus of the Agrobacterium tumefaciens plasmid pTiC58. Powell, B.S., Powell, G.K., Morris, R.O., Rogowsky, P.M., Kado, C.I. Mol. Microbiol. (1987) [Pubmed]
  2. The regulatory VirG protein specifically binds to a cis-acting regulatory sequence involved in transcriptional activation of Agrobacterium tumefaciens virulence genes. Jin, S.G., Roitsch, T., Christie, P.J., Nester, E.W. J. Bacteriol. (1990) [Pubmed]
  3. Constitutive expression of the virulence genes improves the efficiency of plant transformation by Agrobacterium. Hansen, G., Das, A., Chilton, M.D. Proc. Natl. Acad. Sci. U.S.A. (1994) [Pubmed]
  4. Mutants of Agrobacterium tumefaciens with elevated vir gene expression. Pazour, G.J., Ta, C.N., Das, A. Proc. Natl. Acad. Sci. U.S.A. (1991) [Pubmed]
  5. A gene essential for Agrobacterium virulence is homologous to a family of positive regulatory loci. Winans, S.C., Ebert, P.R., Stachel, S.E., Gordon, M.P., Nester, E.W. Proc. Natl. Acad. Sci. U.S.A. (1986) [Pubmed]
  6. Nucleotide sequence of the virulence gene virG of the Agrobacterium tumefaciens octopine Ti plasmid: significant homology between virG and the regulatory genes ompR, phoB and dye of E. coli. Melchers, L.S., Thompson, D.V., Idler, K.B., Schilperoort, R.A., Hooykaas, P.J. Nucleic Acids Res. (1986) [Pubmed]
  7. Genes responsible for the supervirulence phenotype of Agrobacterium tumefaciens A281. Jin, S.G., Komari, T., Gordon, M.P., Nester, E.W. J. Bacteriol. (1987) [Pubmed]
  8. virG, an Agrobacterium tumefaciens transcriptional activator, initiates translation at a UUG codon and is a sequence-specific DNA-binding protein. Pazour, G.J., Das, A. J. Bacteriol. (1990) [Pubmed]
  9. Promoters of Agrobacterium tumefaciens Ti-plasmid virulence genes. Das, A., Stachel, S., Ebert, P., Allenza, P., Montoya, A., Nester, E. Nucleic Acids Res. (1986) [Pubmed]
  10. Swimming against the tide: chemotaxis in Agrobacterium. Shaw, C.H. Bioessays (1991) [Pubmed]
  11. Multiple copies of virG enhance the transient transformation of celery, carrot and rice tissues by Agrobacterium tumefaciens. Liu, C.N., Li, X.Q., Gelvin, S.B. Plant Mol. Biol. (1992) [Pubmed]
  12. Genetic analysis of nonpathogenic Agrobacterium tumefaciens mutants arising in crown gall tumors. Bélanger, C., Canfield, M.L., Moore, L.W., Dion, P. J. Bacteriol. (1995) [Pubmed]
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