1w1w
Sc Smc1hd:Scc1-C complex, ATPgS
Structural highlights
FunctionSMC1_YEAST Involved in chromosome cohesion during cell cycle and in DNA repair. Central component of cohesin complex. The cohesin complex is required for the cohesion of sister chromatids after DNA replication. The cohesin complex apparently forms a large proteinaceous ring within which sister chromatids can be trapped. At anaphase, the complex is cleaved and dissociates from chromatin, allowing sister chromatids to segregate. 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 PubMedA multisubunit complex called cohesin forms a huge ring structure that mediates sister chromatid cohesion, possibly by entrapping sister DNAs following replication. Cohesin's kleisin subunit Scc1 completes the ring, connecting the ABC-like ATPase heads of a V-shaped Smc1/3 heterodimer. Proteolytic cleavage of Scc1 by separase triggers sister chromatid disjunction, presumably by breaking the Scc1 bridge. One half of the SMC-kleisin bridge is revealed here by a crystal structure of Smc1's ATPase complexed with Scc1's C-terminal domain. The latter forms a winged helix that binds a pair of beta strands in Smc1's ATPase head. Mutation of conserved residues within the contact interface destroys Scc1's interaction with Smc1/3 heterodimers and eliminates cohesin function. Interaction of Scc1's N terminus with Smc3 depends on prior C terminus connection with Smc1. There is little or no turnover of Smc1-Scc1 interactions within cohesin complexes in vivo because expression of noncleavable Scc1 after DNA replication does not hinder anaphase. Structure and stability of cohesin's Smc1-kleisin interaction.,Haering CH, Schoffnegger D, Nishino T, Helmhart W, Nasmyth K, Lowe J Mol Cell. 2004 Sep 24;15(6):951-64. PMID:15383284[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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