Function and Regulation of Agrobacterium tumefaciens Cell Surface Structures that Promote Attachment

Current Topics in Microbiology and Immunology
Melene A ThompsonClay Fuqua

Abstract

Agrobacterium tumefaciens attaches stably to plant host tissues and abiotic surfaces. During pathogenesis, physical attachment to the site of infection is a prerequisite to infection and horizontal gene transfer to the plant. Virulent and avirulent strains may also attach to plant tissue in more benign plant associations, and as with other soil microbes, to soil surfaces in the terrestrial environment. Although most A. tumefaciens virulence functions are encoded on the tumor-inducing plasmid, genes that direct general surface attachment are chromosomally encoded, and thus this process is not obligatorily tied to virulence, but is a more fundamental capacity. Several different cellular structures are known or suspected to contribute to the attachment process. The flagella influence surface attachment primarily via their propulsive activity, but control of their rotation during the transition to the attached state may be quite complex. A. tumefaciens produces several pili, including the Tad-type Ctp pili, and several plasmid-borne conjugal pili encoded by the Ti and At plasmids, as well as the so-called T-pilus, involved in interkingdom horizontal gene transfer. The Ctp pili promote reversible interactions with surfaces, whereas ...Continue Reading

Citations

May 28, 2019·Applied and Environmental Microbiology·Stephanie L MathewsAnn G Matthysse
Mar 30, 2019·Molecular Plant-microbe Interactions : MPMI·Maxuel Andrade, Nian Wang
Sep 11, 2020·International Journal of Molecular Sciences·Omar P Troncoso, Fernando G Torres
Feb 12, 2021·Microbiology and Molecular Biology Reviews : MMBR·R Martin RoopDaniel W Martin

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