4O3M

Ternary complex of Bloom's syndrome helicase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.181 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of human Bloom's syndrome helicase in complex with ADP and duplex DNA.

Swan, M.K.Legris, V.Tanner, A.Reaper, P.M.Vial, S.Bordas, R.Pollard, J.R.Charlton, P.A.Golec, J.M.Bertrand, J.A.

(2014) Acta Crystallogr.,Sect.D 70: 1465-1475

  • DOI: 10.1107/S139900471400501X

  • PubMed Abstract: 
  • Bloom's syndrome is an autosomal recessive genome-instability disorder associated with a predisposition to cancer, premature aging and developmental abnormalities. It is caused by mutations that inactivate the DNA helicase activity of the BLM protein ...

    Bloom's syndrome is an autosomal recessive genome-instability disorder associated with a predisposition to cancer, premature aging and developmental abnormalities. It is caused by mutations that inactivate the DNA helicase activity of the BLM protein or nullify protein expression. The BLM helicase has been implicated in the alternative lengthening of telomeres (ALT) pathway, which is essential for the limitless replication of some cancer cells. This pathway is used by 10-15% of cancers, where inhibitors of BLM are expected to facilitate telomere shortening, leading to apoptosis or senescence. Here, the crystal structure of the human BLM helicase in complex with ADP and a 3'-overhang DNA duplex is reported. In addition to the helicase core, the BLM construct used for crystallization (residues 640-1298) includes the RecQ C-terminal (RQC) and the helicase and ribonuclease D C-terminal (HRDC) domains. Analysis of the structure provides detailed information on the interactions of the protein with DNA and helps to explain the mechanism coupling ATP hydrolysis and DNA unwinding. In addition, mapping of the missense mutations onto the structure provides insights into the molecular basis of Bloom's syndrome.


    Organizational Affiliation

    Vertex Pharmaceuticals (Europe), Abingdon, Oxfordshire, England.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Bloom syndrome protein
A
659Homo sapiensGene Names: BLM (RECQ2, RECQL3)
EC: 3.6.4.12
Find proteins for P54132 (Homo sapiens)
Go to Gene View: BLM
Go to UniProtKB:  P54132
Entity ID: 2
MoleculeChainsLengthOrganism
5'-D(*AP*GP*CP*GP*TP*CP*GP*AP*GP*AP*TP*CP*CP*AP*AP*G)-3'P16N/A
Entity ID: 3
MoleculeChainsLengthOrganism
5'-D(*CP*TP*TP*GP*GP*AP*TP*CP*TP*CP*GP*AP*CP*GP*CP*TP*CP*TP*CP*CP*CP*TP*TP*A)-3'T24N/A
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

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A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
ADP
Query on ADP

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Download CCD File 
A
ADENOSINE-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
XTWYTFMLZFPYCI-KQYNXXCUSA-N
 Ligand Interaction
CA
Query on CA

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A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
EDO
Query on EDO

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.181 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 100.930α = 90.00
b = 164.680β = 90.14
c = 50.980γ = 90.00
Software Package:
Software NamePurpose
XDSdata scaling
SHARPphasing
XDSdata reduction
BUSTERrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-03-12
    Type: Initial release
  • Version 1.1: 2014-07-02
    Type: Database references
  • Version 1.2: 2017-11-22
    Type: Refinement description