3UPU

Crystal structure of the T4 Phage SF1B Helicase Dda


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.299 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.204 

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

  • 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: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ATP-dependent DNA helicase dda
A, B, C
459Enterobacteria phage T4Mutation(s): 1 
Gene Names: dda (sud)
EC: 3.6.4.12
Find proteins for P32270 (Enterobacteria phage T4)
Go to UniProtKB:  P32270
Entity ID: 2
MoleculeChainsLengthOrganism
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, C
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.299 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.204 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 225.536α = 90.00
b = 107.253β = 94.13
c = 85.475γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHENIXphasing
PDB_EXTRACTdata extraction
SERGUIdata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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