3W6J

Crystal structure of ScpAB core complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.225 
  • R-Value Observed: 0.227 

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Literature

Molecular basis of SMC ATPase activation: role of internal structural changes of the regulatory subcomplex ScpAB

Kamada, K.Miyata, M.Hirano, T.

(2013) Structure 21: 581-594

  • DOI: 10.1016/j.str.2013.02.016
  • Primary Citation of Related Structures:  
    3W6J, 3W6K

  • PubMed Abstract: 
  • In many bacteria, a homodimer of structural-maintenance-of-chromosomes proteins associates with two regulatory subunits (known as ScpA and ScpB), assembling a protein complex that plays a crucial role in chromosome organization and segregation. It remains poorly understood, however, how this complex might work at the mechanistic level ...

    In many bacteria, a homodimer of structural-maintenance-of-chromosomes proteins associates with two regulatory subunits (known as ScpA and ScpB), assembling a protein complex that plays a crucial role in chromosome organization and segregation. It remains poorly understood, however, how this complex might work at the mechanistic level. Here, we report crystal structures of the ScpAB core complex that display a highly unusual structure in which the central segment of ScpA winds around an asymmetrically oriented ScpB dimer. The two C-terminal domains of the ScpB dimer primarily interact with different regions of ScpA with different affinities. Moreover, flexible interdomain regions of ScpB contribute to a dynamic folding process of the ScpAB subcomplex. Together with other genetic and biochemical assays, we provide evidence that internal structural changes of the ScpAB subcomplex are tightly coupled with activation of the structural-maintenance-of-chromosomes ATPase.


    Organizational Affiliation

    Chromosome Dynamics Laboratory, RIKEN Advanced Science Institute, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan. kamadak@riken.jp



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ScpAA, D174Geobacillus stearothermophilusMutation(s): 0 
Gene Names: scpA
Find proteins for A0A0E0TD69 (Geobacillus sp. (strain Y412MC52))
Explore A0A0E0TD69 
Go to UniProtKB:  A0A0E0TD69
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
ScpBB, C, E, F184Geobacillus stearothermophilusMutation(s): 0 
Gene Names: scpB
Find proteins for A0A0E0TE00 (Geobacillus sp. (strain Y412MC52))
Explore A0A0E0TE00 
Go to UniProtKB:  A0A0E0TE00
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: 0.264 
  • R-Value Work: 0.225 
  • R-Value Observed: 0.227 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 90.856α = 90
b = 127.423β = 113.84
c = 97.218γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
PHENIXmodel building
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHENIXphasing

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 2013-02-15 
  • Released Date: 2013-04-24 
  • Deposition Author(s): Kamada, K., Hirano, T.

Revision History  (Full details and data files)

  • Version 1.0: 2013-04-24
    Type: Initial release
  • Version 1.1: 2013-06-05
    Changes: Database references