Basically, acetosyringone, induces transcription o virulence gene expression in agrobacterium tumerfaciens via VirA proteins
.Monosacharides e.g Arabinose had been shown to induce this transcription not only through the VirA proteins,but also through VirE. Protein.Therefore thre VirA and ChvE forms a separate sugar-mediated regulatory pathway for virulent gene expression in Agro bacterium tumerfaciens.
ChvE, is a chromosomes encoded binding protein in the periplasma of agrobacterium cells. It function in stimulating chemotaxis in the bacteium for movement towards Arabinose sugar.This promotes sugar Uttilization and therefore virulence gene expression in the agrobacterium.
