5DFH

Human APE1 mismatch product complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.949 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.179 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Capturing snapshots of APE1 processing DNA damage.

Freudenthal, B.D.Beard, W.A.Cuneo, M.J.Dyrkheeva, N.S.Wilson, S.H.

(2015) Nat.Struct.Mol.Biol. 22: 924-931

  • DOI: 10.1038/nsmb.3105
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • DNA apurinic-apyrimidinic (AP) sites are prevalent noncoding threats to genomic stability and are processed by AP endonuclease 1 (APE1). APE1 incises the AP-site phosphodiester backbone, generating a DNA-repair intermediate that is potentially cytoto ...

    DNA apurinic-apyrimidinic (AP) sites are prevalent noncoding threats to genomic stability and are processed by AP endonuclease 1 (APE1). APE1 incises the AP-site phosphodiester backbone, generating a DNA-repair intermediate that is potentially cytotoxic. The molecular events of the incision reaction remain elusive, owing in part to limited structural information. We report multiple high-resolution human APE1-DNA structures that divulge new features of the APE1 reaction, including the metal-binding site, the nucleophile and the arginine clamps that mediate product release. We also report APE1-DNA structures with a T-G mismatch 5' to the AP site, representing a clustered lesion occurring in methylated CpG dinucleotides. These structures reveal that APE1 molds the T-G mismatch into a unique Watson-Crick-like geometry that distorts the active site, thus reducing incision. These snapshots provide mechanistic clarity for APE1 while affording a rational framework to manipulate biological responses to DNA damage.


    Organizational Affiliation

    Genome Integrity and Structural Biology Laboratory, National Institute of Environmental Health Sciences (NIEHS), National Institutes of Health, Research Triangle Park, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DNA-(apurinic or apyrimidinic site) lyase
A, B
276Homo sapiensMutation(s): 0 
Gene Names: APEX1 (APE, APE1, APEX, APX, HAP1, REF1)
EC: 3.1.-.-, 4.2.99.18
Find proteins for P27695 (Homo sapiens)
Go to Gene View: APEX1
Go to UniProtKB:  P27695
Entity ID: 2
MoleculeChainsLengthOrganism
DNA (5'-D(P*(3DR)P*CP*GP*AP*CP*GP*GP*AP*TP*CP*C)-3')D11synthetic construct
Entity ID: 3
MoleculeChainsLengthOrganism
DNA (5'-D(*GP*GP*AP*TP*CP*CP*GP*TP*CP*GP*GP*GP*CP*GP*CP*AP*TP*CP*AP*GP*C)-3')V21synthetic construct
Entity ID: 4
MoleculeChainsLengthOrganism
DNA (5'-D(*GP*CP*TP*GP*AP*TP*GP*CP*GP*T)-3')C10synthetic construct
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
EDO
Query on EDO

Download SDF File 
Download CCD File 
A
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

Download SDF File 
Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
3DR
Query on 3DR
D
DNA LINKINGC5 H11 O6 P

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.949 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.179 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 44.434α = 83.86
b = 61.603β = 78.76
c = 72.277γ = 88.19
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-3000data reduction
HKL-3000data scaling

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 General Medical SciencesUnited States--

Revision History 

  • Version 1.0: 2015-10-14
    Type: Initial release
  • Version 1.1: 2015-11-11
    Type: Database references
  • Version 1.2: 2015-12-02
    Type: Database references
  • Version 1.3: 2017-09-20
    Type: Author supporting evidence, Derived calculations