4O3M

Ternary complex of Bloom's syndrome helicase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.183 

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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 D Biol Crystallogr 70: 1465-1475

  • DOI: 10.1107/S139900471400501X
  • Primary Citation of Related Structures:  
    4O3M

  • 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 or nullify protein expression ...

    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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Bloom syndrome proteinA659Homo sapiensMutation(s): 0 
Gene Names: BLMRECQ2RECQL3
EC: 3.6.4.12
UniProt & NIH Common Fund Data Resources
Find proteins for P54132 (Homo sapiens)
Explore P54132 
Go to UniProtKB:  P54132
PHAROS:  P54132
Protein Feature View
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  • Reference Sequence
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  • Entity ID: 2
    MoleculeChainsLengthOrganismImage
    5'-D(*AP*GP*CP*GP*TP*CP*GP*AP*GP*AP*TP*CP*CP*AP*AP*G)-3'B [auth P]16N/A
    Protein Feature View
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    • Reference Sequence
    Find similar nucleic acids by:  (by identity cutoff)  |  Structure
    Entity ID: 3
    MoleculeChainsLengthOrganismImage
    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'C [auth T]24N/A
    Protein Feature View
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    • Reference Sequence
    Experimental Data & Validation

    Experimental Data

    • Method: X-RAY DIFFRACTION
    • Resolution: 2.30 Å
    • R-Value Free: 0.215 
    • R-Value Work: 0.181 
    • R-Value Observed: 0.183 
    • Space Group: C 1 2 1
    Unit Cell:
    Length ( Å )Angle ( ˚ )
    a = 100.93α = 90
    b = 164.68β = 90.14
    c = 50.98γ = 90
    Software Package:
    Software NamePurpose
    SHARPphasing
    BUSTERrefinement
    XDSdata reduction
    XDSdata scaling

    Structure Validation

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    Ligand Structure Quality Assessment  



    Entry History 

    Deposition Data

    Revision History  (Full details and data files)

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