5WN1

APE1 exonuclease product complex

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.216 

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This is version 1.1 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:  
    5WN0, 5WN1, 5WN2, 5WN3, 5WN4, 5WN5

  • 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 cleaves at AP-sites, while the exonuclease activity excises bulkier 3' mismatches and DNA damage to generate clean DNA ends suitable for downstream repair ...

    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. bfreudenthal@kumc.edu.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-(apurinic or apyrimidinic site) lyaseA, B276Homo sapiensMutation(s): 1 
Gene Names: APEX1, APE, APE1, APEX, APX, HAP1, REF1
EC: 3.1 (PDB Primary Data), 4.2.99.18 (PDB Primary Data)
UniProt & NIH Common Fund Data Resources
Find proteins for P27695 (Homo sapiens)
Explore P27695 
Go to UniProtKB:  P27695
PHAROS:  P27695
GTEx:  ENSG00000100823 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP27695
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsLengthOrganismImage
DNA (5'-D(P*TP*CP*GP*AP*CP*GP*GP*AP*TP*CP*C)-3')C 11synthetic construct
Protein Feature View
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  • Reference Sequence

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Entity ID: 3
MoleculeChainsLengthOrganismImage
DNA (5'-D(*GP*CP*TP*GP*AP*TP*GP*CP*G)-3')D 9synthetic construct
Protein Feature View
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Entity ID: 4
MoleculeChainsLengthOrganismImage
DNA (5'-D(*GP*GP*AP*TP*CP*CP*GP*TP*CP*GP*AP*TP*CP*GP*CP*AP*TP*CP*AP*GP*C)-3')E 21synthetic construct
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA
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H [auth E]CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N		 Ligand Interaction
CL
Query on CL
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F [auth B]CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M		 Ligand Interaction
NA
Query on NA
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G [auth B],
I [auth E]		SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.216 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 71.869α = 90
b = 63.528β = 109.43
c = 90.548γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data collection
HKL-2000data scaling
PDB_EXTRACTdata extraction
HKL-2000data reduction
PHENIXphasing

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of Environmental Health Sciences (NIH/NIEHS)United StatesES024431

Revision History  (Full details and data files)

  • Version 1.0: 2018-02-28
    Type: Initial release
  • Version 1.1: 2019-11-27
    Changes: Author supporting evidence