6IS7

Structure of 9N-I DNA polymerase incorporation with dA in the active site

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.225 
  • R-Value Observed: 0.227 

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Literature

Thermococcus sp. 9°N DNA polymerase exhibits 3'-esterase activity that can be harnessed for DNA sequencing.

LinWu, S.W., Tu, Y.H., Tsai, T.Y., Maestre-Reyna, M., Liu, M.S., Wu, W.J., Huang, J.Y., Chi, H.W., Chang, W.H., Chiou, C.F., Wang, A.H., Lee, J., Tsai, M.D.

(2019) Commun Biol 2: 224-224

  • DOI: https://doi.org/10.1038/s42003-019-0458-7
  • Primary Citation of Related Structures:  
    6IS7, 6ISF, 6ISG, 6ISH, 6ISI

  • PubMed Abstract: 

    • It was reported in 1995 that T7 and Taq DNA polymerases possess 3'-esterase activity, but without follow-up studies. Here we report that the 3'-esterase activity is intrinsic to the Thermococcus sp . 9°N DNA polymerase, and that it can be developed into a continuous method for DNA sequencing with dNTP analogs carrying a 3'-ester with a fluorophore ...

    It was reported in 1995 that T7 and Taq DNA polymerases possess 3'-esterase activity, but without follow-up studies. Here we report that the 3'-esterase activity is intrinsic to the Thermococcus sp . 9°N DNA polymerase, and that it can be developed into a continuous method for DNA sequencing with dNTP analogs carrying a 3'-ester with a fluorophore. We first show that 3'-esterified dNTP can be incorporated into a template-primer DNA, and solve the crystal structures of the reaction intermediates and products. Then we show that the reaction can occur continuously, modulated by active site residues Tyr409 and Asp542. Finally, we use 5'-FAM-labeled primer and esterified dNTP with a dye to show that the reaction can proceed to ca. 450 base pairs, and that the intermediates of many individual steps can be identified. The results demonstrate the feasibility of a 3'-editing based DNA sequencing method that could find practical applications after further optimization.

    Organizational Affiliation: 

    3Institute of Biochemical Sciences, National Taiwan University, Taipei, 106 Taiwan.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DNA polymerase
A, B
783Thermococcus sp. 9oN-7Mutation(s): 3 
Gene Names: pol, polA
EC: 2.7.7.7
UniProt
Find proteins for Q56366 (Thermococcus sp. (strain 9oN-7))
Explore Q56366 
Go to UniProtKB:  Q56366
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ56366
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsLengthOrganismImage
DNA (5'-D(P*GP*CP*GP*GP*AP*CP*TP*GP*CP*TP*TP*AP*CP*CP*A)-3')C,
E,
H [auth K],
I [auth L]		15synthetic construct
Protein Feature View
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  • Reference Sequence

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Entity ID: 3
MoleculeChainsLengthOrganismImage
DNA (5'-D(*AP*CP*TP*GP*GP*TP*AP*AP*GP*CP*AP*GP*TP*CP*CP*GP*CP*G)-3')D,
F,
G [auth I]		18synthetic construct
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.225 
  • R-Value Observed: 0.227 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 92.951α = 90
b = 106.767β = 90
c = 255.903γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-08-28
    Type: Initial release