4I98

Crystal structure of the complex between ScpA(residues 1-160)-ScpB(residues 1-183)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.240 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

An asymmetric SMC-kleisin bridge in prokaryotic condensin

Burmann, F.Shin, H.C.Basquin, J.Soh, Y.M.Gimenez-Oya, V.Kim, Y.G.Oh, B.H.Gruber, S.

(2013) Nat.Struct.Mol.Biol. 20: 371-379

  • DOI: 10.1038/nsmb.2488
  • Primary Citation of Related Structures:  3ZGX, 4I99

  • PubMed Abstract: 
  • 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 k ...

    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.


    Organizational Affiliation

    Max Planck Research Group Chromosome Organization and Dynamics, Max Planck Institute of Biochemistry, Martinsried, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Segregation and condensation protein A
A
160Streptococcus pneumoniae (strain P1031)Gene Names: scpA
Find proteins for C1CMI6 (Streptococcus pneumoniae (strain P1031))
Go to UniProtKB:  C1CMI6
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Segregation and condensation protein B
B, C
183Streptococcus pneumoniae (strain P1031)Gene Names: scpB
Find proteins for C1CMI5 (Streptococcus pneumoniae (strain P1031))
Go to UniProtKB:  C1CMI5
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B, C
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.240 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 185.297α = 90.00
b = 82.720β = 98.92
c = 59.909γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data collection
CNSrefinement
SOLVEphasing
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2012-12-05 
  • Released Date: 2013-01-30 
  • Deposition Author(s): Shin, H.C., Oh, B.H.

Revision History 

  • Version 1.0: 2013-01-30
    Type: Initial release
  • Version 1.1: 2014-09-10
    Type: Database references
  • Version 1.2: 2014-12-17
    Type: Experimental preparation