3ZGX

Crystal structure of the kleisin-N SMC interface in prokaryotic condensin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.40 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.243 
  • R-Value Observed: 0.242 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

An Asymmetric Smc-Kleisin Bridge in Prokaryotic Condensin.

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

(2013) Nat Struct Mol Biol 20: 371

  • DOI: 10.1038/nsmb.2488
  • Primary Citation of Related Structures:  
    4I98, 4I99, 3ZGX

  • 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
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CHROMOSOME PARTITION PROTEIN SMCA, B426Bacillus subtilisMutation(s): 0 
Find proteins for P51834 (Bacillus subtilis (strain 168))
Explore P51834 
Go to UniProtKB:  P51834
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
SEGREGATION AND CONDENSATION PROTEIN AC, Z94Bacillus subtilisMutation(s): 0 
Find proteins for P35154 (Bacillus subtilis (strain 168))
Explore P35154 
Go to UniProtKB:  P35154
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.40 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.243 
  • R-Value Observed: 0.242 
  • Space Group: P 43
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 107.435α = 90
b = 107.435β = 90
c = 102.821γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
SCALAdata scaling
PHENIXphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-01-30
    Type: Initial release
  • Version 1.1: 2013-03-27
    Changes: Database references