Crystal structure of EIIB

Experimental Data Snapshot

  • Resolution: 1.65 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.213 

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Analyses of Mlc-IIBGlc interaction and a plausible molecular mechanism of Mlc inactivation by membrane sequestration.

Nam, T.W.Jung, H.I.An, Y.J.Park, Y.H.Lee, S.H.Seok, Y.J.Cha, S.S.

(2008) Proc Natl Acad Sci U S A 105: 3751-3756

  • DOI: https://doi.org/10.1073/pnas.0709295105
  • Primary Citation of Related Structures:  
    3BP3, 3BP8

  • PubMed Abstract: 

    In Escherichia coli, glucose-dependent transcriptional induction of genes encoding a variety of sugar-metabolizing enzymes and transport systems is mediated by the phosphorylation state-dependent interaction of membrane-bound enzyme IICB(Glc) (EIICB(Glc)) with the global repressor Mlc. Here we report the crystal structure of a tetrameric Mlc in a complex with four molecules of enzyme IIB(Glc) (EIIB), the cytoplasmic domain of EIICB(Glc). Each monomer of Mlc has one bound EIIB molecule, indicating the 1:1 stoichiometry. The detailed view of the interface, along with the high-resolution structure of EIIB containing a sulfate ion at the phosphorylation site, suggests that the phosphorylation-induced steric hindrance and disturbance of polar intermolecular interactions impede complex formation. Furthermore, we reveal that Mlc possesses a built-in flexibility for the structural adaptation to its target DNA and that interaction of Mlc with EIIB fused only to dimeric proteins resulted in the loss of its DNA binding ability, suggesting that flexibility of the Mlc structure is indispensable for its DNA binding.

  • Organizational Affiliation

    Department of Biological Sciences and Institute of Microbiology, Seoul National University, Seoul 151-742, Korea.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Glucose-specific phosphotransferase enzyme IIB component
A, B
82Escherichia coliMutation(s): 0 
Gene Names: ptsGglcAumg
Find proteins for P69786 (Escherichia coli (strain K12))
Explore P69786 
Go to UniProtKB:  P69786
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP69786
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on MSE
A, B
Experimental Data & Validation

Experimental Data

  • Resolution: 1.65 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.213 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 108.193α = 90
b = 108.149β = 90
c = 28.947γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-11-04
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance