2WWY

Structure of human RECQ-like helicase in complex with a DNA substrate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.198 

wwPDB Validation 3D Report Full Report


This is version 1.5 of the entry. See complete history

Literature

Recq1 Helicase-Driven DNA Unwinding, Annealing, and Branch Migration: Insights from DNA Complex Structures

Pike, A.C.W.Zhang, Y.Schnecke, C.Chaikuad, A.Krojer, T.Cooper, C.D.O.von Delft, F.Arrowsmith, C.H.Weigelt, J.Edwards, A.Bountra, C.Gileadi, O.

(2015) Proc.Natl.Acad.Sci.USA 112: 4286

  • DOI: 10.1073/pnas.1417594112
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • RecQ helicases are a widely conserved family of ATP-dependent motors with diverse roles in nearly every aspect of bacterial and eukaryotic genome maintenance. However, the physical mechanisms by which RecQ helicases recognize and process specific DNA ...

    RecQ helicases are a widely conserved family of ATP-dependent motors with diverse roles in nearly every aspect of bacterial and eukaryotic genome maintenance. However, the physical mechanisms by which RecQ helicases recognize and process specific DNA replication and repair intermediates are largely unknown. Here, we solved crystal structures of the human RECQ1 helicase in complexes with tailed-duplex DNA and ssDNA. The structures map the interactions of the ssDNA tail and the branch point along the helicase and Zn-binding domains, which, together with reported structures of other helicases, define the catalytic stages of helicase action. We also identify a strand-separating pin, which (uniquely in RECQ1) is buttressed by the protein dimer interface. A duplex DNA-binding surface on the C-terminal domain is shown to play a role in DNA unwinding, strand annealing, and Holliday junction (HJ) branch migration. We have combined EM and analytical ultracentrifugation approaches to show that RECQ1 can form what appears to be a flat, homotetrameric complex and propose that RECQ1 tetramers are involved in HJ recognition. This tetrameric arrangement suggests a platform for coordinated activity at the advancing and receding duplexes of an HJ during branch migration.


    Related Citations: 
    • Structure of the Human Recq1 Helicase Reveals a Putative Strand-Separation Pin.
      Pike, A.C.W.,Shrestha, B.,Popuri, V.,Burgess-Brown, N.,Muzzolini, L.,Costantini, S.,Vindigni, A.,Gileadi, O.
      (2009) Proc.Natl.Acad.Sci.USA 106: 1039


    Organizational Affiliation

    Structural Genomics Consortium, University of Oxford, Oxford OX3 7DQ, United Kingdom;




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ATP-DEPENDENT DNA HELICASE Q1
A, B
591Homo sapiensMutation(s): 0 
Gene Names: RECQL (RECQ1, RECQL1)
EC: 3.6.4.12
Find proteins for P46063 (Homo sapiens)
Go to Gene View: RECQL
Go to UniProtKB:  P46063
Entity ID: 2
MoleculeChainsLengthOrganism
DNA OLIGO (27BP)O,Q,R,T27synthetic construct
Entity ID: 3
MoleculeChainsLengthOrganism
5'-D(*DA DG DC DG DT DC DG DA DG DA DT DC DCP)-3'P,S13synthetic construct
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A, B
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
SO4
Query on SO4

Download SDF File 
Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
EDO
Query on EDO

Download SDF File 
Download CCD File 
A, B
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.198 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 58.333α = 90.00
b = 174.218β = 93.31
c = 100.229γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-12-29
    Type: Initial release
  • Version 1.1: 2015-04-01
    Type: Database references, Derived calculations, Version format compliance
  • Version 1.2: 2015-04-15
    Type: Database references
  • Version 1.3: 2015-04-22
    Type: Database references
  • Version 1.4: 2015-09-16
    Type: Derived calculations, Source and taxonomy
  • Version 1.5: 2018-01-24
    Type: Database references