1OWF

Crystal structure of a mutant IHF (BetaE44A) complexed with the native H' Site


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.232 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Integration Host Factor: putting a twist on protein-DNA recognition

Lynch, T.W.Read, E.K.Mattis, A.N.Gardner, J.F.Rice, P.A.

(2003) J Mol Biol 330: 493-502

  • DOI: 10.1016/s0022-2836(03)00529-1
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Integration host factor (IHF) is a DNA-bending protein that recognizes its cognate sites through indirect readout. Previous studies have shown that binding of wild-type (WT)-IHF is disrupted by a T to A mutation at the center position of a conserved ...

    Integration host factor (IHF) is a DNA-bending protein that recognizes its cognate sites through indirect readout. Previous studies have shown that binding of wild-type (WT)-IHF is disrupted by a T to A mutation at the center position of a conserved TTR motif in its binding site, and that substitution of betaGlu44 with Ala prevented IHF from discriminating between A and T at this position. We have determined the crystal structures and relative binding affinities for all combinations of WT-IHF and IHF-betaGlu44Ala bound to the WT and mutant DNAs. Comparison of these structures reveals that DNA twist plays a major role in DNA recognition by IHF, and that this geometric parameter is dependent on the dinucleotide step and not on the bound IHF variant.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, The University of Chicago, 920 E 58th Street CLSC 221, Chicago, IL 60637, USA.



Macromolecules

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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
Integration Host Factor Alpha-subunitA99Escherichia coliMutation(s): 0 
Find proteins for P0A6X7 (Escherichia coli (strain K12))
Explore P0A6X7 
Go to UniProtKB:  P0A6X7
Protein Feature View
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  • Reference Sequence

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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetails
Integration Host Factor beta-subunitB94Escherichia coliMutation(s): 1 
Find proteins for P0A6Y1 (Escherichia coli (strain K12))
Explore P0A6Y1 
Go to UniProtKB:  P0A6Y1
Protein Feature View
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  • Reference Sequence

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Entity ID: 1
MoleculeChainsLengthOrganism
Phage lambda H' siteC35N/A
  • Find similar nucleic acids by: Sequence   |   Structure
Entity ID: 2
MoleculeChainsLengthOrganism
5'-D(*GP*GP*CP*CP*AP*AP*AP*AP*AP*AP*GP*CP*AP*TP*T)-3'D15N/A
  • Find similar nucleic acids by: Sequence   |   Structure
Entity ID: 3
MoleculeChainsLengthOrganism
5'-D(*GP*CP*TP*TP*AP*TP*CP*AP*AP*TP*TP*TP*GP*TP*TP*GP*CP*AP*CP*C)-3'E20N/A
Small Molecules
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
DNAKd :  4.599999904632568   nM  PDBBind
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.232 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 46.66α = 90
b = 58.832β = 90
c = 181.314γ = 90
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-07-15
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance