1P51

Anabaena HU-DNA cocrystal structure (AHU6)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.338 
  • R-Value Work: 0.286 
  • R-Value Observed: 0.291 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Flexible DNA bending in HU-DNA cocrystal structures

Swinger, K.K.Lemberg, K.M.Zhang, Y.Rice, P.A.

(2003) EMBO J 22: 3749-3760

  • DOI: 10.1093/emboj/cdg351
  • Primary Citation of Related Structures:  
    1P51, 1P71, 1P78

  • PubMed Abstract: 
  • HU and IHF are members of a family of prokaryotic proteins that interact with the DNA minor groove in a sequence-specific (IHF) or non-specific (HU) manner to induce and/or stabilize DNA bending. HU plays architectural roles in replication initiation, transcription regulation and site-specific recombination, and is associated with bacterial nucleoids ...

    HU and IHF are members of a family of prokaryotic proteins that interact with the DNA minor groove in a sequence-specific (IHF) or non-specific (HU) manner to induce and/or stabilize DNA bending. HU plays architectural roles in replication initiation, transcription regulation and site-specific recombination, and is associated with bacterial nucleoids. Cocrystal structures of Anabaena HU bound to DNA (1P71, 1P78, 1P51) reveal that while underlying proline intercalation and asymmetric charge neutralization mechanisms of DNA bending are similar for IHF and HU, HU stabilizes different DNA bend angles ( approximately 105-140 degrees ). The two bend angles within a single HU complex are not coplanar, and the resulting dihedral angle is consistent with negative supercoiling. Comparison of HU-DNA and IHF-DNA structures suggests that sharper bending is correlated with longer DNA binding sites and smaller dihedral angles. An HU-induced bend may be better modeled as a hinge, not a rigid bend. The ability to induce or stabilize varying bend angles is consistent with HU's role as an architectural cofactor in many different systems that may require differing geometries.


    Organizational Affiliation

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



Macromolecules

Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-binding protein HUE [auth A], F [auth B], G [auth C], H [auth D]94Anabaena sp.Mutation(s): 0 
Gene Names: HUP OR HANA OR ASR3935
UniProt
Find proteins for P05514 (Nostoc sp. (strain PCC 7120 / SAG 25.82 / UTEX 2576))
Explore P05514 
Go to UniProtKB:  P05514
Protein Feature View
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  • Reference Sequence
  • Find similar nucleic acids by:  Sequence   |   Structure
  • Entity ID: 1
    MoleculeChainsLengthOrganismImage
    5'-D(*GP*CP*AP*TP*AP*TP*CP*AP*AP*TP*TP*TP*GP*TP*TP*GP*CP*AP*T)-3'A [auth E], B [auth F], D [auth H], C [auth I]19N/A
    Protein Feature View
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    • Reference Sequence
    Small Molecules
    Binding Affinity Annotations 
    IDSourceBinding Affinity
    DNA PDBBind:  1P51 Kd: 3.5 (nM) from 1 assay(s)
    Experimental Data & Validation

    Experimental Data

    • Method: X-RAY DIFFRACTION
    • Resolution: 2.50 Å
    • R-Value Free: 0.338 
    • R-Value Work: 0.286 
    • R-Value Observed: 0.291 
    • Space Group: P 1 21 1
    Unit Cell:
    Length ( Å )Angle ( ˚ )
    a = 37.646α = 90
    b = 107.836β = 92.25
    c = 83.464γ = 90
    Software Package:
    Software NamePurpose
    REFMACrefinement
    DENZOdata reduction
    SCALEPACKdata scaling
    EPMRphasing

    Structure Validation

    View Full Validation Report




    Entry History 

    Deposition Data

    Revision History  (Full details and data files)

    • Version 1.0: 2003-05-13
      Type: Initial release
    • Version 1.1: 2008-04-29
      Changes: Version format compliance
    • Version 1.2: 2011-07-13
      Changes: Advisory, Version format compliance