5C6G

Structural Insights into the Scc2-Scc4 Cohesin Loader


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.227 
  • R-Value Observed: 0.230 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural Studies Reveal the Functional Modularity of the Scc2-Scc4 Cohesin Loader.

Chao, W.C.Murayama, Y.Munoz, S.Costa, A.Uhlmann, F.Singleton, M.R.

(2015) Cell Rep 12: 719-725

  • DOI: 10.1016/j.celrep.2015.06.071
  • Primary Citation of Related Structures:  
    5C6G

  • PubMed Abstract: 
  • The remarkable accuracy of eukaryotic cell division is partly maintained by the cohesin complex acting as a molecular glue to prevent premature sister chromatid separation. The loading of cohesin onto chromosomes is catalyzed by the Scc2-Scc4 loader complex ...

    The remarkable accuracy of eukaryotic cell division is partly maintained by the cohesin complex acting as a molecular glue to prevent premature sister chromatid separation. The loading of cohesin onto chromosomes is catalyzed by the Scc2-Scc4 loader complex. Here, we report the crystal structure of Scc4 bound to the N terminus of Scc2 and show that Scc4 is a tetratricopeptide repeat (TPR) superhelix. The Scc2 N terminus adopts an extended conformation and is entrapped by the core of the Scc4 superhelix. Electron microscopy (EM) analysis reveals that the Scc2-Scc4 loader complex comprises three domains: a head, body, and hook. Deletion studies unambiguously assign the Scc2N-Scc4 as the globular head domain, whereas in vitro cohesin loading assays show that the central body and the hook domains are sufficient to catalyze cohesin loading onto circular DNA, but not chromatinized DNA in vivo, suggesting a possible role for Scc4 as a chromatin adaptor.


    Organizational Affiliation

    Lincoln's Inn Fields Laboratory, The Francis Crick Institute, 44 Lincoln's Inn Fields, London WC2A 3LY, UK. Electronic address: martin.singleton@crick.ac.uk.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
AGR133CpA, C620Eremothecium gossypii ATCC 10895Mutation(s): 0 
Gene Names: AGOS_AGR133C
Find proteins for Q74ZR5 (Ashbya gossypii (strain ATCC 10895 / CBS 109.51 / FGSC 9923 / NRRL Y-1056))
Explore Q74ZR5 
Go to UniProtKB:  Q74ZR5
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Sister chromatid cohesion protein 2B, D218Eremothecium gossypii ATCC 10895Mutation(s): 0 
Gene Names: SCC2AGL133W
Find proteins for Q750S2 (Ashbya gossypii (strain ATCC 10895 / CBS 109.51 / FGSC 9923 / NRRL Y-1056))
Explore Q750S2 
Go to UniProtKB:  Q750S2
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.227 
  • R-Value Observed: 0.230 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 112.24α = 90
b = 88.81β = 118.49
c = 116γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
Aimlessdata scaling
SHARPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-08-05
    Type: Initial release
  • Version 1.1: 2015-08-12
    Changes: Database references