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Annu Rev Cell Dev Biol. 2006;22:101-27.

Agrobacterium tumefaciens and plant cell interactions and activities required for interkingdom macromolecular transfer.

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  • 1Department of Biology and Plant Sciences Institute, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6018, USA.

Abstract

Host recognition and macromolecular transfer of virulence-mediating effectors represent critical steps in the successful transformation of plant cells by Agrobacterium tumefaciens. This review focuses on bacterial and plant-encoded components that interact to mediate these two processes. First, we examine the means by which Agrobacterium recognizes the host, via both diffusible plant-derived chemicals and cell-cell contact, with emphasis on the mechanisms by which multiple host signals are recognized and activate the virulence process. Second, we characterize the recognition and transfer of protein and protein-DNA complexes through the bacterial and plant cell membrane and wall barriers, emphasizing the central role of a type IV secretion system-the VirB complex-in this process.

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