Figure 2.
Active site of Osa is essential for T-DNA transfer in vivo. Results of GUS (β-glucuronidase) assay after agroinfiltration of Nicotiana tabaccum leaf discs are shown. Blue-green color indicates GUS expression, and thus transfer of gus gene flanked with T-DNA borders from Agrobacterium into plant. Blank: Agrobacterium resuspension buffer, Mock: Agrobacterium tumefaciens LBA4404 strain alone, Control: LBA4404 containing pCAMBIA1301 and pSoup vector alone, without any insert. Test experiments had Agrobacterium clones harboring pCAMBIA1301 and pSoup containing either Osa or one of its mutants, or other FINs; ICE1056Fin, FipA and PifC.
