Agrobacterium tumefaciens is a gram-negative soil bacterium
that causes crown gall tumors on dicotyledenous plants. The
transferred DNA (T-DNA) portion of the A. tumefaciens tumor-inducing
(Ti) plasmid enters infected plant cells and integrates into
plant nuclear DNA. The T-DNA is accompanied into plant cells by the
VirD2 endonuclease covalently attached...