1xex

Structural biochemistry of ATP-driven dimerization and DNA stimulated activation of SMC ATPases.

spinqualitylabelsall models 1xex, resolution 2.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1xex is a 2 chain structure with sequence from Pyrococcus furiosus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.5Å Ligands: ATP, MG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function SMC_PYRFU Required for chromosome condensation and partitioning (By similarity). Binds single-stranded but not double-stranded DNA.[HAMAP-Rule:MF_01894] 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 PubMed Structural maintenance of chromosome (SMC) proteins play a central role in higher-order chromosome structure in all kingdoms of life. SMC proteins consist of a long coiled-coil domain that joins an ATP binding cassette (ABC) ATPase domain on one side and a dimerization domain on the other side. SMC proteins require ATP binding or hydrolysis to promote cohesion and condensation, which is suggested to proceed via formation of SMC rings or assemblies. To learn more about the role of ATP in the architecture of SMC proteins, we report crystal structures of nucleotide-free and ATP bound P. furiosus SMC ATPase domains. ATP dimerizes two SMC ATPase domains by binding to opposing Walker A and signature motifs, indicating that ATP binding can directly assemble SMC proteins. DNA stimulates ATP hydrolysis in the engaged SMC ABC domains, suggesting that ATP hydrolysis can be allosterically regulated. Structural and mutagenesis data identify an SMC protein conserved-arginine finger that is required for DNA stimulation of the ATPase activity and directly connects a putative DNA interaction site to ATP. Our results suggest that stimulation of the SMC ATPase activity may be a specific feature to regulate the ATP-driven assembly and disassembly of SMC proteins. Structural biochemistry of ATP-driven dimerization and DNA-stimulated activation of SMC ATPases.,Lammens A, Schele A, Hopfner KP Curr Biol. 2004 Oct 5;14(19):1778-82. PMID:15458651 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Condensin

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