4PJU

crystal structure of human Stromal Antigen 2 (SA2) in complex with Sister Chromatid Cohesion protein 1 (Scc1)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.05 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.195 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of cohesin subcomplex pinpoints direct shugoshin-Wapl antagonism in centromeric cohesion.

Hara, K.Zheng, G.Qu, Q.Liu, H.Ouyang, Z.Chen, Z.Tomchick, D.R.Yu, H.

(2014) Nat.Struct.Mol.Biol. 21: 864-870

  • DOI: 10.1038/nsmb.2880
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Orderly termination of sister-chromatid cohesion during mitosis is critical for accurate chromosome segregation. During prophase, mitotic kinases phosphorylate cohesin and its protector sororin, triggering Wapl-dependent cohesin release from chromoso ...

    Orderly termination of sister-chromatid cohesion during mitosis is critical for accurate chromosome segregation. During prophase, mitotic kinases phosphorylate cohesin and its protector sororin, triggering Wapl-dependent cohesin release from chromosome arms. The shugoshin (Sgo1)-PP2A complex protects centromeric cohesin until its cleavage by separase at anaphase onset. Here, we report the crystal structure of a human cohesin subcomplex comprising SA2 and Scc1. Multiple HEAT repeats of SA2 form a dragon-shaped structure. Scc1 makes extensive contacts with SA2, with one binding hotspot. Sgo1 and Wapl compete for binding to a conserved site on SA2-Scc1. At this site, mutations of SA2 residues that disrupt Wapl binding bypass the Sgo1 requirement in cohesion protection. Thus, in addition to recruiting PP2A to dephosphorylate cohesin and sororin, Sgo1 physically shields cohesin from Wapl. This unexpected, direct antagonism between Sgo1 and Wapl augments centromeric cohesion protection.


    Organizational Affiliation

    1] Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, Texas, USA. [2] [3].




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cohesin subunit SA-2
A
981Homo sapiensMutation(s): 0 
Gene Names: STAG2 (SA2)
Find proteins for Q8N3U4 (Homo sapiens)
Go to Gene View: STAG2
Go to UniProtKB:  Q8N3U4
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Double-strand-break repair protein rad21 homolog
B
140Homo sapiensMutation(s): 0 
Gene Names: RAD21 (HR21, KIAA0078, NXP1, SCC1)
Find proteins for O60216 (Homo sapiens)
Go to Gene View: RAD21
Go to UniProtKB:  O60216
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.05 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.195 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 78.606α = 90.00
b = 108.752β = 90.00
c = 181.791γ = 90.00
Software Package:
Software NamePurpose
HKL-3000data collection
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Howard Hughes Medical InstituteUnited States--
Cancer Prevention and Research Institute of TexasUnited StatesRP110465
Welch FoundationUnited StatesI-1441

Revision History 

  • Version 1.0: 2014-08-27
    Type: Initial release
  • Version 1.1: 2014-09-17
    Type: Database references
  • Version 1.2: 2014-10-15
    Type: Database references