3AU2

DNA polymerase X from Thermus thermophilus HB8 complexed with Ca-dGTP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.4 Å
  • R-Value Free: 0.188 
  • R-Value Work: 0.162 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

The structural basis of the kinetic mechanism of a gap-filling X-family DNA polymerase that binds Mg(2+)-dNTP before binding to DNA.

Nakane, S.Ishikawa, H.Nakagawa, N.Kuramitsu, S.Masui, R.

(2012) J.Mol.Biol. 417: 179-196

  • DOI: 10.1016/j.jmb.2012.01.025
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • DNA with single-nucleotide (1-nt) gaps can arise during various DNA processing events. These lesions are repaired by X-family DNA polymerases (PolXs) with high gap-filling activity. Some PolXs can bind productively to dNTPs in the absence of DNA and ...

    DNA with single-nucleotide (1-nt) gaps can arise during various DNA processing events. These lesions are repaired by X-family DNA polymerases (PolXs) with high gap-filling activity. Some PolXs can bind productively to dNTPs in the absence of DNA and fill these 1-nt gaps. Although PolXs have a crucial role in efficient gap filling, currently, little is known of the kinetic and structural details of their productive dNTP binding. Here, we show that Thermus thermophilus HB8 PolX (ttPolX) had strong binding affinity for Mg(2+)-dNTPs in the absence of DNA and that it follows a Theorell-Chance (hit-and-run) mechanism with nucleotide binding first. Comparison of the intermediate crystal structures of ttPolX in a binary complex with dGTP and in a ternary complex with 1-nt gapped DNA and Mg(2+)-ddGTP revealed that the conformation of the incoming nucleotide depended on whether or not DNA was present. Furthermore, the Lys263 residue located between two guanosine conformations was essential to the strong binding affinity of the enzyme. The ability to bind to either syn-dNTP or anti-dNTP and the involvement of a Theorell-Chance mechanism are key aspects of the strong nucleotide-binding and efficient gap-filling activities of ttPolX.


    Organizational Affiliation

    Department of Biological Sciences, Graduate School of Science, Osaka University, 1-1 Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DNA polymerase beta family (X family)
A
575Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579)Mutation(s): 0 
Find proteins for Q5SJ64 (Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579))
Go to UniProtKB:  Q5SJ64
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

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Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
CA
Query on CA

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Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
DGT
Query on DGT

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Download CCD File 
A
2'-DEOXYGUANOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O13 P3
HAAZLUGHYHWQIW-KVQBGUIXSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.4 Å
  • R-Value Free: 0.188 
  • R-Value Work: 0.162 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 69.189α = 90.00
b = 53.286β = 107.52
c = 84.877γ = 90.00
Software Package:
Software NamePurpose
SOLVEphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data collection
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-01-25
    Type: Initial release
  • Version 1.1: 2013-12-25
    Type: Database references