4i99

Crystal structure of the SmcHead bound to the C-winged helix domain of ScpA

spinqualitylabelsall models 4i99, resolution 2.30Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4i99 is a 4 chain structure with sequence from Pyrococcus furiosus DSM 3638. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.3Å Ligands: MSE, PO4 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] Publication Abstract from PubMed Eukaryotic structural maintenance of chromosomes (SMC)-kleisin complexes form large, ring-shaped assemblies that promote accurate chromosome segregation. Their asymmetric structural core comprises SMC heterodimers that associate with both ends of a kleisin subunit. However, prokaryotic condensin Smc-ScpAB is composed of symmetric Smc homodimers associated with the kleisin ScpA in a postulated symmetrical manner. Here, we demonstrate that Smc molecules have two distinct binding sites for ScpA. The N terminus of ScpA binds the Smc coiled coil, whereas the C terminus binds the Smc ATPase domain. We show that in Bacillus subtilis cells, an Smc dimer is bridged by a single ScpAB to generate asymmetric tripartite rings analogous to eukaryotic SMC complexes. We define a molecular mechanism that ensures asymmetric assembly, and we conclude that the basic architecture of SMC-kleisin rings evolved before the emergence of eukaryotes. An asymmetric SMC-kleisin bridge in prokaryotic condensin.,Burmann F, Shin HC, Basquin J, Soh YM, Gimenez-Oya V, Kim YG, Oh BH, Gruber S Nat Struct Mol Biol. 2013 Jan 27;20(3):371-9. doi: 10.1038/nsmb.2488. Epub 2013, Jan 27. PMID:23353789 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Condensin

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