2V1X

Crystal structure of human RECQ-like DNA helicase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.235 

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Literature

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 U S A 106: 1039

  • DOI: 10.1073/pnas.0806908106
  • Primary Citation of Related Structures:  
    2V1X

  • PubMed Abstract: 
  • RecQ-like helicases, which include 5 members in the human genome, are important in maintaining genome integrity. We present a crystal structure of a truncated form of the human RECQ1 protein with Mg-ADP. The truncated protein is active in DNA fork unwinding but lacks other activities of the full-length enzyme: disruption of Holliday junctions and DNA strand annealing ...

    RecQ-like helicases, which include 5 members in the human genome, are important in maintaining genome integrity. We present a crystal structure of a truncated form of the human RECQ1 protein with Mg-ADP. The truncated protein is active in DNA fork unwinding but lacks other activities of the full-length enzyme: disruption of Holliday junctions and DNA strand annealing. The structure of human RECQ1 resembles that of Escherichia coli RecQ, with some important differences. All structural domains are conserved, including the 2 RecA-like domains and the RecQ-specific zinc-binding and winged-helix (WH) domains. However, the WH domain is positioned at a different orientation from that of the E. coli enzyme. We identify a prominent beta-hairpin of the WH domain as essential for DNA strand separation, which may be analogous to DNA strand-separation features of other DNA helicases. This hairpin is significantly shorter in the E. coli enzyme and is not required for its helicase activity, suggesting that there are significant differences between the modes of action of RecQ family members.


    Organizational Affiliation

    Structural Genomics Consortium, Old Road Campus Research Building, Roosevelt Drive, University of Oxford, Oxford OX3 7DQ, United Kingdom.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ATP-DEPENDENT DNA HELICASE Q1A, B591Homo sapiensMutation(s): 0 
Gene Names: RECQLRECQ1RECQL1
EC: 3.6.1 (PDB Primary Data), 3.6.4.12 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for P46063 (Homo sapiens)
Explore P46063 
Go to UniProtKB:  P46063
PHAROS:  P46063
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ADP (Subject of Investigation/LOI)
Query on ADP

Download Ideal Coordinates CCD File 
C [auth A], J [auth B]ADENOSINE-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
XTWYTFMLZFPYCI-KQYNXXCUSA-N
 Ligand Interaction
ZN
Query on ZN

Download Ideal Coordinates CCD File 
E [auth A], L [auth B]ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
EDO
Query on EDO

Download Ideal Coordinates CCD File 
R [auth B], S [auth B]1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

Download Ideal Coordinates CCD File 
F [auth A] , G [auth A] , H [auth A] , I [auth A] , M [auth B] , N [auth B] , O [auth B] , P [auth B] , 
F [auth A],  G [auth A],  H [auth A],  I [auth A],  M [auth B],  N [auth B],  O [auth B],  P [auth B],  Q [auth B]
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
MG
Query on MG

Download Ideal Coordinates CCD File 
D [auth A], K [auth B]MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.235 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 83.229α = 90
b = 97.647β = 104.5
c = 85.849γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
MOLREPphasing

Structure Validation

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Ligand Structure Quality Assessment  



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-07-03
    Type: Initial release
  • Version 1.1: 2015-01-21
    Changes: Database references, Derived calculations, Other, Structure summary, Version format compliance