3RPU

Crystal structure of the MukE-MukF complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.60 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.220 

wwPDB Validation   3D Report Full Report


This is version 1.0 of the entry. See complete history


Literature

The role of MukE in assembling a functional MukBEF complex.

Gloyd, M.Ghirlando, R.Guarne, A.

(2011) J Mol Biol 412: 578-590

  • DOI: 10.1016/j.jmb.2011.08.009
  • Primary Citation of Related Structures:  
    3RPU

  • PubMed Abstract: 
  • The MukB-MukE-MukF protein complex is essential for chromosome condensation and segregation in Escherichia coli. The central component of this complex, the MukB protein, is related functionally and structurally to the ubiquitous SMC (structural maintenance of chromosomes) proteins ...

    The MukB-MukE-MukF protein complex is essential for chromosome condensation and segregation in Escherichia coli. The central component of this complex, the MukB protein, is related functionally and structurally to the ubiquitous SMC (structural maintenance of chromosomes) proteins. In a manner similar to SMC, MukB requires the association of two accessory proteins (MukE and MukF) for its function. MukF is a constitutive dimer that bridges the interaction between MukB and MukE. While MukB can condense DNA on its own, it requires MukF and MukE to ensure proper chromosome segregation. Here, we present a novel structure of the E. coli MukE-MukF complex, in which the intricate crystal packing interactions reveal an alternative MukE dimerization interface spanning both N- and C-terminal winged-helix domains of the protein. The structure also unveils additional cross-linking interactions between adjacent MukE-MukF complexes mediated by MukE. A variant of MukE encompassing point mutations on one of these surfaces does not affect assembly of the MukB-MukE-MukF complex and yet cannot restore the temperature sensitivity of the mukE∷kan strain, suggesting that this surface may mediate critical protein-protein interactions between MukB-MukE-MukF complexes. Since the dimerization interface of MukE overlaps with the region of the protein that interacts with MukB in the MukB-MukE-MukF complex, we suggest that competing MukB-MukE and MukE-MukE interactions may regulate the formation of higher-order structures of bacterial condensin.


    Organizational Affiliation

    Department of Biochemistry and Biomedical Sciences, HSC-4N57A, McMaster University, Hamilton, ON, Canada L8S 4K1.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Chromosome partition protein mukFA,
D [auth B],
G [auth X]
460Escherichia coli K-12Mutation(s): 0 
Gene Names: b0922JW0905kicBmukFmukF (kicB)
UniProt
Find proteins for P60293 (Escherichia coli (strain K12))
Explore P60293 
Go to UniProtKB:  P60293
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP60293
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Chromosome partition protein mukE245Escherichia coli K-12Mutation(s): 0 
Gene Names: b0923JW0906kicAmukEMukE (kicAycbAycbA)
UniProt
Find proteins for P22524 (Escherichia coli (strain K12))
Explore P22524 
Go to UniProtKB:  P22524
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP22524
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.60 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.220 
  • Space Group: P 65 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 149.89α = 90
b = 149.89β = 90
c = 738.551γ = 120
Software Package:
Software NamePurpose
CBASSdata collection
PHASERphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-03-14
    Type: Initial release