2cc3
Structure of Agrobacterium tumefaciens VirB8 proteinStructure of Agrobacterium tumefaciens VirB8 protein
Structural highlights
FunctionVIRB8_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. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedBacterial type IV secretion systems (T4SS) translocate DNA and/or proteins to recipient cells, thus providing a mechanism for conjugative transfer of genetic material and bacterial pathogenesis. Here we describe the first structure of a core component from the archetypal Agrobacterium tumefaciens T4SS: the 2.2-A resolution crystal structure of the VirB8 periplasmic domain (pVirB8(AT)). VirB8 forms a dimer in the crystal, and we identify residues likely important for stabilization of the dimer interface. Structural comparison of pVirB8(AT) with Brucella suis VirB8 confirms that the monomers have a similar fold. In addition, the pVirB8(AT) dimer superimposes very closely on the B. suis VirB8 dimer, supporting the proposal that dimer formation in the crystal reflects self-interactions that are biologically significant. The evolutionary conservation level for each residue was obtained from a data set of 84 VirB8 homologs and projected onto the protein structure to indicate conserved surface patches that likely contact other T4SS proteins. Agrobacterium tumefaciens VirB8 structure reveals potential protein-protein interaction sites.,Bailey S, Ward D, Middleton R, Grossmann JG, Zambryski PC Proc Natl Acad Sci U S A. 2006 Feb 21;103(8):2582-7. Epub 2006 Feb 15. PMID:16481621[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References |
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