2xka | pdb_00002xka

Crystal structure of a GTPyS-form protofilament of Bacillus thuringiensis serovar israelensis TubZ

spinqualitylabelsall models 2xka, resolution 3.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2xka is a 7 chain structure with sequence from Bacti. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: GSP, MG Related: 2xkb Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Low copy number plasmids often depend on accurate partitioning systems for their continued survival. Generally, such systems consist of a centromere-like region of DNA, a DNA-binding adaptor, and a polymerizing cytomotive filament. Together these components drive newly replicated plasmids to opposite ends of the dividing cell. The Bacillus thuringiensis plasmid pBToxis relies on a filament of the tubulin/FtsZ-like protein TubZ for its segregation. By combining crystallography and electron microscopy, we have determined the structure of this filament. We explain how GTP hydrolysis weakens the subunit-subunit contact and also shed light on the partitioning of the plasmid-adaptor complex. The double helical superstructure of TubZ filaments is unusual for tubulin-like proteins. Filaments of ParM, the actin-like partitioning protein, are also double helical. We suggest that convergent evolution shapes these different types of cytomotive filaments toward a general mechanism for plasmid separation. Filament structure of bacterial tubulin homologue TubZ.,Aylett CH, Wang Q, Michie KA, Amos LA, Lowe J Proc Natl Acad Sci U S A. 2010 Oct 25. PMID:20974911 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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