VirD4-independent transformation by CloDF13 evidences an unknown factor required for the genetic colonization of plants via Agrobacterium

Molecular Microbiology
Jesús EscuderoPaul J J Hooykaas

Abstract

Agrobacterium uses a mechanism similar to conjugation for trans-kingdom transfer of its oncogenic T-DNA. A defined VirB/VirD4 Type IV secretion system is responsible for such a genetic transfer. In addition, certain virulence proteins as VirE2 can be mobilized into host cells by the same apparatus. VirE2 is essential to achieve plant but not yeast transformation. We found that the limited host range plasmid CloDF13 can be recruited by the virulence apparatus of Agrobacterium for transfer to eukaryotic hosts. As expected the VirB transport complex was required for such trans-kingdom DNA transfer. However, unexpectedly, the coupling factor VirD4 turned out to be necessary for transfer to plants but not for transport into yeast. The CloDF13 encoded coupling factor (Mob) was essential for transfer to both plants and yeast though. This is interpreted by the different specificities of Mob and VirD4. Hence, Mob being required for the transport of the CloDF13 transferred DNA (to both plants and yeast) and VirD4 being required for transport of virulence proteins such as VirE2. Nevertheless, the presence of the VirE2 protein in the host plant was not sufficient to restore the deficiency for VirD4 in the transforming bacteria. We propose ...Continue Reading

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Citations

Apr 9, 2013·Journal of Bacteriology·Eric CascalesPeter J Christie
Jan 13, 2005·Proceedings of the National Academy of Sciences of the United States of America·Annette C VergunstPaul J J Hooykaas

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