5KG6

Human DNA polymerase eta-DNA ternary complex: reaction first with 1 mM Mn2+ for 1800s then with 10 mM Ca2+ for 60s


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.55 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.195 

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Literature

Capture of a third Mg2+ is essential for catalyzing DNA synthesis.

Gao, Y.Yang, W.

(2016) Science 352: 1334-1337

  • DOI: 10.1126/science.aad9633
  • Primary Citation of Related Structures:  
    5KFI, 5KFH, 5KFK, 5KFJ, 5KFM, 5KFL, 5KFO, 5KG0, 5KFN, 5KFA, 5KFC, 5KFB, 5KFE, 5KFD, 5KFG, 5KFF, 5KFY, 5KFX, 5KFZ, 5KFQ, 5KG2, 5KFP, 5KG1, 5KFS, 5KG4, 5KFR, 5KG3, 5KFU, 5KG6, 5KFT, 5KG5, 5KFW, 5KFV, 5KG7, 5L9X

  • PubMed Abstract: 
  • It is generally assumed that an enzyme-substrate (ES) complex contains all components necessary for catalysis and that conversion to products occurs by rearrangement of atoms, protons, and electrons. However, we find that DNA synthesis does not occur in a fully assembled DNA polymerase-DNA-deoxynucleoside triphosphate complex with two canonical metal ions bound ...

    It is generally assumed that an enzyme-substrate (ES) complex contains all components necessary for catalysis and that conversion to products occurs by rearrangement of atoms, protons, and electrons. However, we find that DNA synthesis does not occur in a fully assembled DNA polymerase-DNA-deoxynucleoside triphosphate complex with two canonical metal ions bound. Using time-resolved x-ray crystallography, we show that the phosphoryltransfer reaction takes place only after the ES complex captures a third divalent cation that is not coordinated by the enzyme. Binding of the third cation is incompatible with the basal ES complex and requires thermal activation of the ES for entry. It is likely that the third cation provides the ultimate boost over the energy barrier to catalysis of DNA synthesis.


    Organizational Affiliation

    Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA. wei.yang@nih.gov.



Macromolecules

Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DNA polymerase etaA435Homo sapiensMutation(s): 0 
Gene Names: POLHRAD30RAD30AXPV
EC: 2.7.7.7
UniProt & NIH Common Fund Data Resources
Find proteins for Q9Y253 (Homo sapiens)
Explore Q9Y253 
Go to UniProtKB:  Q9Y253
PHAROS:  Q9Y253
Protein Feature View
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  • Reference Sequence
  • Find similar nucleic acids by:  Sequence   |   Structure
  • Entity ID: 2
    MoleculeChainsLengthOrganismImage
    DNA (5'-D(*CP*AP*TP*TP*AP*TP*GP*AP*CP*GP*CP*T)-3')B [auth T]12Homo sapiens
    Protein Feature View
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    • Reference Sequence
    • Find similar nucleic acids by:  Sequence   |   Structure
    • Entity ID: 3
      MoleculeChainsLengthOrganismImage
      DNA (5'-D(*AP*GP*CP*GP*TP*CP*AP*TP*A)-3')C [auth P]9Homo sapiens
      Protein Feature View
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      • Reference Sequence
      Experimental Data & Validation

      Experimental Data

      • Method: X-RAY DIFFRACTION
      • Resolution: 1.55 Å
      • R-Value Free: 0.229 
      • R-Value Work: 0.192 
      • R-Value Observed: 0.195 
      • Space Group: P 61
      Unit Cell:
      Length ( Å )Angle ( ˚ )
      a = 98.11α = 90
      b = 98.11β = 90
      c = 81.96γ = 120
      Software Package:
      Software NamePurpose
      PHENIXrefinement
      XSCALEdata scaling
      PDB_EXTRACTdata extraction
      XDSdata reduction
      MOLREPphasing

      Structure Validation

      View Full Validation Report



      Ligand Structure Quality Assessment  



      Entry History & Funding Information

      Deposition Data

      • Deposited Date: 2016-06-12 
      • Released Date: 2016-06-29 
      • Deposition Author(s): Gao, Y., Yang, W.

      Funding OrganizationLocationGrant Number
      National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK)United StatesIntramural DK036146-08

      Revision History  (Full details and data files)

      • Version 1.0: 2016-06-29
        Type: Initial release
      • Version 1.1: 2017-09-20
        Changes: Author supporting evidence, Database references, Derived calculations
      • Version 1.2: 2019-12-25
        Changes: Author supporting evidence