6M7T

Human DNA polymerase eta in a non-productive ternary complex with Ca2+ and dTTP oppositing cdA

  • Classification: TRANSFERASE/DNA
  • Organism(s): Homo sapiens
  • Expression System: Escherichia coli
  • Mutation(s): No 

  • Deposited: 2018-08-21 Released: 2018-09-12 
  • Deposition Author(s): Weng, P., Gao, Y., Yang, W.
  • Funding Organization(s): National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK)

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.222 

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Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history. 


Literature

Bypassing a 8,5'-cyclo-2'-deoxyadenosine lesion by human DNA polymerase eta at atomic resolution.

Weng, P.J., Gao, Y., Gregory, M.T., Wang, P., Wang, Y., Yang, W.

(2018) Proc Natl Acad Sci U S A 115: 10660-10665

  • DOI: 10.1073/pnas.1812856115
  • Primary Citation of Related Structures:  
    6M7O, 6M7P, 6M7T, 6M7U, 6M7V

  • PubMed Abstract: 

    • Oxidatively induced DNA lesions 8,5'-cyclopurine-2'-deoxynucleosides (cdPus) are prevalent and cytotoxic by impeding DNA replication and transcription. Both the 5' R - and 5' S -diastereomers of cdPu can be removed by nucleotide excision repair; however, the 5' S -cdPu is more resistant to repair than the 5' R counterpart ...

    Oxidatively induced DNA lesions 8,5'-cyclopurine-2'-deoxynucleosides (cdPus) are prevalent and cytotoxic by impeding DNA replication and transcription. Both the 5' R - and 5' S -diastereomers of cdPu can be removed by nucleotide excision repair; however, the 5' S -cdPu is more resistant to repair than the 5' R counterpart. Here, we report the crystal structures of human polymerase (Pol) η bypassing 5' S -8,5'-cyclo-2'-deoxyadenosine (cdA) in insertion and the following two extension steps. The cdA-containing DNA structures vary in response to the protein environment. Supported by the "molecular splint" of Pol η, the structure of 5' S -cdA at 1.75-Å resolution reveals that the backbone is pinched toward the minor groove and the adenine base is tilted. In the templating position, the cdA takes up the extra space usually reserved for the thymine dimer, and dTTP is efficiently incorporated by Pol η in the presence of Mn 2+ Rigid distortions of the DNA duplex by cdA, however, prevent normal base pairing and hinder immediate primer extension by Pol η. Our results provide structural insights into the strong replication blockage effect and the mutagenic property of the cdPu lesions in cells.

    Organizational Affiliation: 

    Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892; yinsheng.wang@ucr.edu wei.yang@nih.gov.



Macromolecules

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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DNA polymerase etaA435Homo 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
GTEx:  ENSG00000170734
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsLengthOrganismImage
DNA (5'-D(*AP*GP*TP*GP*TP*GP*AP*G)-3')B [auth P]8Homo sapiens
Protein Feature View
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  • Reference Sequence

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Entity ID: 3
MoleculeChainsLengthOrganismImage
DNA (5'-D(*AP*TP*(02I)P*CP*TP*CP*AP*CP*AP*CP*T)-3')C [auth T]11Homo sapiens
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
TTP (Subject of Investigation/LOI)
Query on TTP
Download Ideal Coordinates CCD File 
E [auth A]THYMIDINE-5'-TRIPHOSPHATE
C10 H17 N2 O14 P3
NHVNXKFIZYSCEB-XLPZGREQSA-N		 Ligand Interaction
GOL
Query on GOL
Download Ideal Coordinates CCD File 
H [auth A], I [auth A], J [auth A]GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N		 Ligand Interaction
EDO
Query on EDO
Download Ideal Coordinates CCD File 
G [auth A]1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N		 Ligand Interaction
NI
Query on NI
Download Ideal Coordinates CCD File 
D [auth A]NICKEL (II) ION
Ni
VEQPNABPJHWNSG-UHFFFAOYSA-N		 Ligand Interaction
CA
Query on CA
Download Ideal Coordinates CCD File 
F [auth A]CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.222 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 65.65α = 90
b = 80.93β = 90
c = 140.38γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling
PHENIXphasing

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK)United StatesDK036146

Revision History  (Full details and data files)

  • Version 1.0: 2018-09-12
    Type: Initial release
  • Version 1.1: 2018-10-17
    Changes: Data collection, Database references
  • Version 1.2: 2018-10-31
    Changes: Data collection, Database references
  • Version 1.3: 2019-12-25
    Changes: Author supporting evidence