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Gene Review:

virJ - hypothetical protein

Agrobacterium tumefaciens

Kalogeraki, V.S. et al., Pan, S.Q. et al.

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High impact information on virJ

Southern analysis revealed that virJ is present on the Ti plasmid of an octopine but not a nopaline strain whereas acvB is present on the chromosomes of both octopine and nopaline strains [1].
This reading frame is not found in the nopaline-type Ti plasmid pTiC58. acvB is required for tumorigenesis by a strain carrying a nopaline-type Ti plasmid, and virJ complements this nontumorigenic phenotype, indicating that the products of these genes have similar functions [2].
A virJ-phoA fusion expressed enzymatically active alkaline phosphatase, indicating that VirJ is at least partially exported. virJ is induced in a VirA/VirG-dependent fashion by the vir gene inducer acetosyringone [2].

References

An Agrobacterium virulence factor encoded by a Ti plasmid gene or a chromosomal gene is required for T-DNA transfer into plants. Pan, S.Q., Jin, S., Boulton, M.I., Hawes, M., Gordon, M.P., Nester, E.W. Mol. Microbiol. (1995) [Pubmed]
The octopine-type Ti plasmid pTiA6 of Agrobacterium tumefaciens contains a gene homologous to the chromosomal virulence gene acvB. Kalogeraki, V.S., Winans, S.C. J. Bacteriol. (1995) [Pubmed]

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