8exh
Agrobacterium tumefaciens Tpilus
Structural highlights
FunctionVIRB2_AGRFC VirB proteins are suggested to act at the bacterial surface and there play an important role in directing T-DNA transfer to plant cells. Publication Abstract from PubMedConjugation is a major mechanism of horizontal gene transfer promoting the spread of antibiotic resistance among human pathogens. It involves establishing a junction between a donor and a recipient cell via an extracellular appendage known as the mating pilus. In bacteria, the conjugation machinery is encoded by plasmids or transposons and typically mediates the transfer of cognate mobile genetic elements. Much less is known about conjugation in archaea. Here, we determine atomic structures by cryo-electron microscopy of three conjugative pili, two from hyperthermophilic archaea (Aeropyrum pernix and Pyrobaculum calidifontis) and one encoded by the Ti plasmid of the bacterium Agrobacterium tumefaciens, and show that the archaeal pili are homologous to bacterial mating pili. However, the archaeal conjugation machinery, known as Ced, has been 'domesticated', that is, the genes for the conjugation machinery are encoded on the chromosome rather than on mobile genetic elements, and mediates the transfer of cellular DNA. Archaeal DNA-import apparatus is homologous to bacterial conjugation machinery.,Beltran LC, Cvirkaite-Krupovic V, Miller J, Wang F, Kreutzberger MAB, Patkowski JB, Costa TRD, Schouten S, Levental I, Conticello VP, Egelman EH, Krupovic M Nat Commun. 2023 Feb 7;14(1):666. doi: 10.1038/s41467-023-36349-8. PMID:36750723[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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