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Gene Review

virH1  -  hypothetical protein

Agrobacterium tumefaciens

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High impact information on virH1

  • Ferulic acid was far more toxic than caffeic acid to the wild-type strain, although the wild-type strain was more resistant to ferulic acid than was the virH mutant [1].
  • One of these is the 2.5-kb virH locus, which was previously identified on the octopine-type Ti plasmid but thought to be absent from the nopaline-type Ti plasmid [2].
  • The virH operon contains two genes that resemble P-450-type monooxygenases [2].
  • The vir region covering 30.2-kb has found to be composed of 21 genes resembling virH1, virA, virB1-11, virG, virC1-2, and virD1-5 [3].


  1. The phenolic vir gene inducer ferulic acid is O-demethylated by the VirH2 protein of an Agrobacterium tumefaciens Ti plasmid. Kalogeraki, V.S., Zhu, J., Eberhard, A., Madsen, E.L., Winans, S.C. Mol. Microbiol. (1999) [Pubmed]
  2. Wound-released chemical signals may elicit multiple responses from an Agrobacterium tumefaciens strain containing an octopine-type Ti plasmid. Kalogeraki, V.S., Winans, S.C. J. Bacteriol. (1998) [Pubmed]
  3. Genome structure of Ri plasmid (3). Sequencing analysis of the vir region of pRi1724 in Japanese Agrobacterium rhizogenes. Satuti, N., Moriguchi, K., Sato, M., Kataoka, M., Maeda, Y., Tanaka, N., Yoshida, K. Nucleic Acids Symp. Ser. (2000) [Pubmed]
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