5WN0

APE1 exonuclease substrate complex with a C/G match


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.217 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Molecular snapshots of APE1 proofreading mismatches and removing DNA damage.

Whitaker, A.M.Flynn, T.S.Freudenthal, B.D.

(2018) Nat Commun 9: 399-399

  • DOI: 10.1038/s41467-017-02175-y
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Human apurinic/apyrimidinic (AP) endonuclease 1 (APE1) is an essential DNA repair enzyme which uses a single active site to process DNA damage via two distinct activities: (1) AP-endonuclease and (2) 3' to 5' exonuclease. The AP-endonuclease activity ...

    Human apurinic/apyrimidinic (AP) endonuclease 1 (APE1) is an essential DNA repair enzyme which uses a single active site to process DNA damage via two distinct activities: (1) AP-endonuclease and (2) 3' to 5' exonuclease. The AP-endonuclease activity cleaves at AP-sites, while the exonuclease activity excises bulkier 3' mismatches and DNA damage to generate clean DNA ends suitable for downstream repair. Molecular details of the exonuclease reaction and how one active site can accommodate various toxic DNA repair intermediates remains elusive despite being biologically important. Here, we report multiple high-resolution APE1-DNA structural snapshots revealing how APE1 removes 3' mismatches and DNA damage by placing the 3' group within the intra-helical DNA cavity via a non-base flipping mechanism. This process is facilitated by a DNA nick, instability of a mismatched/damaged base, and bending of the DNA. These results illustrate how APE1 cleanses DNA dirty-ends to generate suitable substrates for downstream repair enzymes.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, University of Kansas Medical Center, Kansas City, KS, 66160, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DNA-(apurinic or apyrimidinic site) lyase
A, B
276Homo sapiensMutation(s): 1 
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*TP*CP*GP*AP*CP*GP*GP*AP*TP*CP*C)-3')C11synthetic construct
Entity ID: 3
MoleculeChainsLengthOrganism
DNA (5'-D(*GP*CP*TP*GP*AP*TP*GP*CP*GP*C)-3')D10synthetic construct
Entity ID: 4
MoleculeChainsLengthOrganism
DNA (5'-D(*GP*GP*AP*TP*CP*CP*GP*TP*CP*GP*AP*GP*CP*GP*CP*AP*TP*CP*AP*GP*C)-3')E21synthetic construct
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.217 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 44.264α = 82.59
b = 61.942β = 76.88
c = 73.765γ = 85.89
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
PHENIXphasing
PHENIXrefinement
HKL-2000data scaling
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of HealthUnited States--

Revision History 

  • Version 1.0: 2018-02-28
    Type: Initial release