3UPU

Crystal structure of the T4 Phage SF1B Helicase Dda


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.30 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.206 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

The T4 Phage SF1B Helicase Dda Is Structurally Optimized to Perform DNA Strand Separation.

He, X.Byrd, A.K.Yun, M.K.Pemble, C.W.Harrison, D.Yeruva, L.Dahl, C.Kreuzer, K.N.Raney, K.D.White, S.W.

(2012) Structure 20: 1189-1200

  • DOI: 10.1016/j.str.2012.04.013
  • Primary Citation of Related Structures:  
    3UPU

  • PubMed Abstract: 
  • Helicases move on DNA via an ATP binding and hydrolysis mechanism coordinated by well-characterized helicase motifs. However, the translocation along single-stranded DNA (ssDNA) and the strand separation of double-stranded (dsDNA) may be loosely or t ...

    Helicases move on DNA via an ATP binding and hydrolysis mechanism coordinated by well-characterized helicase motifs. However, the translocation along single-stranded DNA (ssDNA) and the strand separation of double-stranded (dsDNA) may be loosely or tightly coupled. Dda is a phage T4 SF1B helicase with sequence homology to the Pif1 family of helicases that tightly couples translocation to strand separation. The crystal structure of the Dda-ssDNA binary complex reveals a domain referred to as the "pin" that was previously thought to remain static during strand separation. The pin contains a conserved phenylalanine that mediates a transient base-stacking interaction that is absolutely required for separation of dsDNA. The pin is secured at its tip by protein-protein interactions through an extended SH3 domain thereby creating a rigid strut. The conserved interface between the pin and the SH3 domain provides the mechanism for tight coupling of translocation to strand separation.


    Organizational Affiliation

    Department of Structural Biology, St. Jude Children's Research Hospital, 262 Danny Thomas Place, Memphis, TN 38105, USA.



Macromolecules

Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ATP-dependent DNA helicase ddaABC459Escherichia virus T4Mutation(s): 1 
Gene Names: ddasud
EC: 3.6.4.12
Find proteins for P32270 (Enterobacteria phage T4)
Explore P32270 
Go to UniProtKB:  P32270
Protein Feature View
Expand
  • Reference Sequence
  • Find similar nucleic acids by:  Sequence   |   Structure
  • Entity ID: 2
    MoleculeChainsLengthOrganismImage
    5'-D(*TP*TP*TP*TP*TP*TP*TP*T)-3'D, E, F8N/A
    Small Molecules
    Modified Residues  1 Unique
    IDChainsTypeFormula2D DiagramParent
    MSE
    Query on MSE
    A,B,CL-PEPTIDE LINKINGC5 H11 N O2 SeMET
    Experimental Data & Validation

    Experimental Data

    • Method: X-RAY DIFFRACTION
    • Resolution: 3.30 Å
    • R-Value Free: 0.258 
    • R-Value Work: 0.204 
    • R-Value Observed: 0.206 
    • Space Group: C 1 2 1
    Unit Cell:
    Length ( Å )Angle ( ˚ )
    a = 225.536α = 90
    b = 107.253β = 94.128
    c = 85.475γ = 90
    Software Package:
    Software NamePurpose
    PHENIXrefinement
    PDB_EXTRACTdata extraction
    SERGUIdata collection
    HKL-2000data reduction
    HKL-2000data scaling
    PHENIXphasing

    Structure Validation

    View Full Validation Report



    Entry History 

    Deposition Data

    Revision History 

    • Version 1.0: 2012-06-20
      Type: Initial release
    • Version 1.1: 2012-07-25
      Changes: Database references
    • Version 1.2: 2017-11-08
      Changes: Refinement description