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Characterization of the virE locus of Agrobacterium tumefaciens plasmid pTiC58.

The virE locus that is responsible for the efficiency of infection by Agrobacterium tumefaciens (T. Hirooka and C. Kado, J. Bacteriol. 168:237-243, 1986) is located next to the right boundary of the virulence ( Vir) region of the nopaline plasmid pTiC58. This locus is very similar to the virE locus of octopine type Ti plasmids on the basis of nucleotide and amino acid sequence comparisons as well as genetic complementation analyses. The nucleotide sequence of virE revealed three open reading frames, arranged as an operon, with a potential coding capacity for proteins of 9, 7.1, and 63.5 kilodaltons. The promoter region of virE was analyzed by using gene fusions to promoterless cat and lux genes. Two different promoters were detected, one which operates in A. tumefaciens and one which operates in Escherichia coli. virE is transcribed from left to right toward the T region. In A. tumefaciens, the expression of virE was induced by acetosyringone and required the presence of pTiC58.[1]

References

  1. Characterization of the virE locus of Agrobacterium tumefaciens plasmid pTiC58. Hirooka, T., Rogowsky, P.M., Kado, C.I. J. Bacteriol. (1987) [Pubmed]
 
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