5TB8

Precatalytic ternary complex of Human DNA Polymerase Beta in closed conformation With Gapped DNA substrate incoming (-)3TC-TP and Mn2+.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.184 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.8 of the entry. See complete history


Literature

Structural Insights into the Post-Chemistry Steps of Nucleotide Incorporation Catalyzed by a DNA Polymerase.

Reed, A.J.Vyas, R.Raper, A.T.Suo, Z.

(2017) J Am Chem Soc 139: 465-471

  • DOI: https://doi.org/10.1021/jacs.6b11258
  • Primary Citation of Related Structures:  
    5TB8, 5TB9, 5TBA, 5TBB, 5TBC

  • PubMed Abstract: 

    DNA polymerases are essential enzymes that faithfully and efficiently replicate genomic information.1-3 The mechanism of nucleotide incorporation by DNA polymerases has been extensively studied structurally and kinetically, but several key steps following phosphodiester bond formation remain structurally uncharacterized due to utilization of natural nucleotides. It is thought that the release of pyrophosphate (PP i ) triggers reverse conformational changes in a polymerase in order to complete a full catalytic cycle as well as prepare for DNA translocation and subsequent incorporation events. Here, by using the triphosphates of chain-terminating antiviral drugs lamivudine ((-)3TC-TP) and emtricitabine ((-)FTC-TP), we structurally reveal the correct sequence of post-chemistry steps during nucleotide incorporation by human DNA polymerase β (hPolβ) and provide a structural basis for PP i release. These post-catalytic structures reveal hPolβ in an open conformation with PP i bound in the active site, thereby strongly suggesting that the reverse conformational changes occur prior to PP i release. The results also help to refine the role of the newly discovered third divalent metal ion for DNA polymerase-catalyzed nucleotide incorporation. Furthermore, a post-chemistry structure of hPolβ in the open conformation, following incorporation of (-)3TC-MP, with a second (-)3TC-TP molecule bound to the active site in the absence of PP i , suggests that nucleotide binding stimulates PP i dissociation and occurs before polymerase translocation. Our structural characterization defines the order of the elusive post-chemistry steps in the canonical mechanism of a DNA polymerase.


  • Organizational Affiliation

    Department of Chemistry and Biochemistry and ‡The Ohio State Biochemistry Program, The Ohio State University , Columbus, Ohio 43210, United States.


Macromolecules

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
DNA polymerase beta343Homo sapiensMutation(s): 0 
Gene Names: POLB
EC: 2.7.7.7 (PDB Primary Data), 4.2.99 (PDB Primary Data), 4.2.99.18 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for P06746 (Homo sapiens)
Explore P06746 
Go to UniProtKB:  P06746
PHAROS:  P06746
GTEx:  ENSG00000070501 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP06746
Sequence Annotations
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  • Reference Sequence

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Entity ID: 2
MoleculeChains LengthOrganismImage
5-MER PHOSPHORYLATED DOWNSTREAM PRIMEB [auth D]5synthetic construct
Sequence Annotations
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  • Reference Sequence

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Entity ID: 3
MoleculeChains LengthOrganismImage
10- MER PRIMERC [auth P]10synthetic construct
Sequence Annotations
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  • Reference Sequence

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Entity ID: 4
MoleculeChains LengthOrganismImage
16- MER TEMPLATED [auth T]16synthetic construct
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
1RZ
Query on 1RZ

Download Ideal Coordinates CCD File 
E [auth A]Lamivudine Triphosphate
C8 H14 N3 O12 P3 S
YLEQMGZZMCJKCN-NKWVEPMBSA-N
ACT
Query on ACT

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S [auth A]
T [auth A]
U [auth A]
V [auth A]
W [auth A]
S [auth A],
T [auth A],
U [auth A],
V [auth A],
W [auth A],
X [auth A]
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
MN
Query on MN

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F [auth A]
G [auth A]
H [auth A]
I [auth A]
J [auth A]
F [auth A],
G [auth A],
H [auth A],
I [auth A],
J [auth A],
K [auth A]
MANGANESE (II) ION
Mn
WAEMQWOKJMHJLA-UHFFFAOYSA-N
CL
Query on CL

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Q [auth A],
R [auth A]
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
NA
Query on NA

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L [auth A],
M [auth A],
N [auth A],
O [auth A],
P [auth A]
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.184 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 49.48α = 90
b = 81.4β = 110.28
c = 53.57γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of Environmental Health Sciences (NIH/NIEHS)United StatesES024585
National Institutes of Health/National Institute of Environmental Health Sciences (NIH/NIEHS)United StatesES026821
National Science Foundation (NSF, United States)United StatesMCB-0960961

Revision History  (Full details and data files)

  • Version 1.0: 2017-01-11
    Type: Initial release
  • Version 1.1: 2017-01-25
    Changes: Data collection, Database references
  • Version 1.2: 2017-09-13
    Changes: Advisory, Author supporting evidence
  • Version 1.3: 2017-10-04
    Changes: Derived calculations
  • Version 1.4: 2019-07-17
    Changes: Data collection, Derived calculations, Structure summary
  • Version 1.5: 2019-11-27
    Changes: Author supporting evidence
  • Version 1.6: 2023-02-01
    Changes: Advisory, Database references, Derived calculations
  • Version 1.7: 2023-10-04
    Changes: Data collection
  • Version 1.8: 2023-10-25
    Changes: Refinement description