5DFF

Human APE1 product complex

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.57 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.187 

wwPDB Validation   3D Report Full Report


This is version 1.4 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:  
    5DFF, 5DFH, 5DFI, 5DFJ, 5DG0

  • 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 cytotoxic. The molecular events of the incision reaction remain elusive, owing in part to limited structural information ...

    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

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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-(apurinic or apyrimidinic site) lyaseA, B276Homo sapiensMutation(s): 0 
Gene Names: APEX1, APE, APE1, APEX, APX, HAP1, REF1
EC: 4.2.99.18 (PDB Primary Data), 3.1 (UniProt)
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*(3DR)P*CP*GP*AP*CP*GP*GP*AP*TP*CP*C)-3')C [auth D]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*GP*C)-3')D [auth P]10synthetic construct
Protein Feature View
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsLengthOrganismImage
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')E [auth V]21synthetic construct
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.57 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.187 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 44.514α = 83.89
b = 61.716β = 78.81
c = 72.053γ = 88
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

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 StatesZ01-ES050158

Revision History  (Full details and data files)

  • Version 1.0: 2015-10-14
    Type: Initial release
  • Version 1.1: 2015-11-11
    Changes: Database references
  • Version 1.2: 2015-12-02
    Changes: Database references
  • Version 1.3: 2017-09-20
    Changes: Author supporting evidence, Derived calculations
  • Version 1.4: 2019-12-18
    Changes: Author supporting evidence