8E8C

Human DNA polymerase eta-DNA-rU-ended primer ternary mismatch complex:reaction with 10 mM Mn2+ for 30s

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.194 

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This is version 1.2 of the entry. See complete history. 


Literature

Primer terminal ribonucleotide alters the active site dynamics of DNA polymerase eta and reduces DNA synthesis fidelity.

Chang, C., Lee Luo, C., Eleraky, S., Lin, A., Zhou, G., Gao, Y.

(2023) J Biol Chem 299: 102938-102938

  • DOI: https://doi.org/10.1016/j.jbc.2023.102938
  • Primary Citation of Related Structures:  
    8E85, 8E86, 8E87, 8E88, 8E89, 8E8A, 8E8B, 8E8C, 8E8D, 8E8E, 8E8F, 8E8G, 8E8H, 8E8J, 8E8K

  • PubMed Abstract: 

    • DNA polymerases catalyze DNA synthesis with high efficiency, which is essential for all life. Extensive kinetic and structural efforts have been executed in exploring mechanisms of DNA polymerases, surrounding their kinetic pathway, catalytic mechanisms, and factors that dictate polymerase fidelity ...

    DNA polymerases catalyze DNA synthesis with high efficiency, which is essential for all life. Extensive kinetic and structural efforts have been executed in exploring mechanisms of DNA polymerases, surrounding their kinetic pathway, catalytic mechanisms, and factors that dictate polymerase fidelity. Recent time-resolved crystallography studies on DNA polymerase η (Pol η) and β have revealed essential transient events during the DNA synthesis reaction, such as mechanisms of primer deprotonation, separated roles of the three metal ions, and conformational changes that disfavor incorporation of the incorrect substrate. DNA-embedded ribonucleotides (rN) are the most common lesion on DNA and a major threat to genome integrity. While kinetics of rN incorporation has been explored and structural studies have revealed that DNA polymerases have a steric gate that destabilizes rNTP binding, the mechanism of extension upon rN addition remains poorly characterized. Using steady-state kinetics, static and time-resolved X-ray crystallography with Pol η as a model system, we showed that the extra hydroxyl group on the primer terminus does alter the dynamics of the polymerase active site as well as the catalysis and fidelity of DNA synthesis. During rN extension, Pol η error incorporation efficiency increases significantly across different sequence contexts. Finally, our systematic structural studies suggest that the rN at the primer end improves primer alignment and reduces barriers in C2´-endo to C3´-endo sugar conformational change. Overall, our work provides further mechanistic insights into the effects of rN incorporation on DNA synthesis.

    Organizational Affiliation: 

    Department of Biosciences, Rice University, Houston, Texas, 77005, USA. Electronic address: yg60@rice.edu.



Macromolecules

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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DNA polymerase eta435Homo sapiensMutation(s): 0 
Gene Names: POLH, RAD30, RAD30A, XPV
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
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9Y253
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsLengthOrganismImage
DNA (5'-D(*CP*AP*TP*TP*AP*TP*GP*AP*CP*GP*CP*T)-3')B [auth T]12synthetic construct
Protein Feature View
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  • Reference Sequence

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Entity ID: 3
MoleculeChainsLengthOrganismImage
DNA/RNA (5'-D(*AP*GP*CP*GP*TP*CP*A)-R(P*U)-3')C [auth P]8synthetic construct
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
DGT (Subject of Investigation/LOI)
Query on DGT
Download Ideal Coordinates CCD File 
F [auth A]2'-DEOXYGUANOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O13 P3
HAAZLUGHYHWQIW-KVQBGUIXSA-N		 Ligand Interaction
MN (Subject of Investigation/LOI)
Query on MN
Download Ideal Coordinates CCD File 
D [auth A],
E [auth A]		MANGANESE (II) ION
Mn
WAEMQWOKJMHJLA-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.194 
  • Space Group: P 61
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 97.8α = 90
b = 97.8β = 90
c = 81.64γ = 120
Software Package:
Software NamePurpose
XSCALEdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
XDSdata reduction
MOLREPphasing

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesT32GM008280
Cancer Prevention and Research Institute of Texas (CPRIT)United StatesRR190046
Welch FoundationUnited StatesC-2033-20200401

Revision History  (Full details and data files)

  • Version 1.0: 2023-02-01
    Type: Initial release
  • Version 1.1: 2023-02-08
    Changes: Database references
  • Version 1.2: 2023-03-08
    Changes: Database references