5EWE

Ternary complex of human DNA polymerase eta inserting rCTP opposite template G


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.66 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.171 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Mechanism of Ribonucleotide Incorporation by Human DNA Polymerase eta.

Su, Y.Egli, M.Guengerich, F.P.

(2016) J.Biol.Chem. 291: 3747-3756

  • DOI: 10.1074/jbc.M115.706226
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Ribonucleotides and 2'-deoxyribonucleotides are the basic units for RNA and DNA, respectively, and the only difference is the extra 2'-OH group on the ribonucleotide sugar. Cellular rNTP concentrations are much higher than those of dNTP. When copying ...

    Ribonucleotides and 2'-deoxyribonucleotides are the basic units for RNA and DNA, respectively, and the only difference is the extra 2'-OH group on the ribonucleotide sugar. Cellular rNTP concentrations are much higher than those of dNTP. When copying DNA, DNA polymerases not only select the base of the incoming dNTP to form a Watson-Crick pair with the template base but also distinguish the sugar moiety. Some DNA polymerases use a steric gate residue to prevent rNTP incorporation by creating a clash with the 2'-OH group. Y-family human DNA polymerase η (hpol η) is of interest because of its spacious active site (especially in the major groove) and tolerance of DNA lesions. Here, we show that hpol η maintains base selectivity when incorporating rNTPs opposite undamaged DNA and the DNA lesions 7,8-dihydro-8-oxo-2'-deoxyguanosine and cyclobutane pyrimidine dimer but with rates that are 10(3)-fold lower than for inserting the corresponding dNTPs. X-ray crystal structures show that the hpol η scaffolds the incoming rNTP to pair with the template base (dG) or 7,8-dihydro-8-oxo-2'-deoxyguanosine with a significant propeller twist. As a result, the 2'-OH group avoids a clash with the steric gate, Phe-18, but the distance between primer end and Pα of the incoming rNTP increases by 1 Å, elevating the energy barrier and slowing polymerization compared with dNTP. In addition, Tyr-92 was identified as a second line of defense to maintain the position of Phe-18. This is the first crystal structure of a DNA polymerase with an incoming rNTP opposite a DNA lesion.


    Organizational Affiliation

    From the Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-0146.,From the Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-0146 f.guengerich@vanderbilt.edu.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DNA polymerase eta
A
435Homo sapiensMutation(s): 0 
Gene Names: POLH (RAD30, RAD30A, XPV)
EC: 2.7.7.7
Find proteins for Q9Y253 (Homo sapiens)
Go to Gene View: POLH
Go to UniProtKB:  Q9Y253
Entity ID: 2
MoleculeChainsLengthOrganism
DNA (5'-D(*CP*AP*TP*GP*AP*TP*GP*AP*CP*GP*CP*T)-3')T12synthetic construct
Entity ID: 3
MoleculeChainsLengthOrganism
DNA (5'-D(*AP*GP*CP*GP*TP*CP*AP*T)-3')P8synthetic construct
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GOL
Query on GOL

Download SDF File 
Download CCD File 
A
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
CA
Query on CA

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

Download SDF File 
Download CCD File 
A
CYTIDINE-5'-TRIPHOSPHATE
C9 H16 N3 O14 P3
PCDQPRRSZKQHHS-XVFCMESISA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.66 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.171 
  • Space Group: P 61
Unit Cell:
Length (Å)Angle (°)
a = 99.282α = 90.00
b = 99.282β = 90.00
c = 81.895γ = 120.00
Software Package:
Software NamePurpose
PHASERphasing
ARPmodel building
HKL-2000data scaling
PHENIXrefinement
Cootmodel building
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of Environmental Health SciencesUnited StatesR01 ES010375
National Institutes of Health/National Cancer InstituteUnited StatesP01 CA160032

Revision History 

  • Version 1.0: 2016-01-13
    Type: Initial release
  • Version 1.1: 2016-01-20
    Type: Database references
  • Version 1.2: 2016-03-02
    Type: Database references
  • Version 1.3: 2017-09-13
    Type: Author supporting evidence, Database references, Derived calculations