8DW4

Glycosylase MutY variant N146S in complex with DNA containing d(8-oxo-G) paired with an abasic site product (AP) generated by the enzyme in crystals by removal of calcium


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.49 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.231 
  • R-Value Observed: 0.232 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Literature

Structural snapshots of base excision by the cancer-associated variant MutY N146S reveal a retaining mechanism.

Demir, M.Russelburg, L.P.Lin, W.J.Trasvina-Arenas, C.H.Huang, B.Yuen, P.K.Horvath, M.P.David, S.S.

(2023) Nucleic Acids Res 51: 1034-1049

  • DOI: https://doi.org/10.1093/nar/gkac1246
  • Primary Citation of Related Structures:  
    8DVP, 8DVY, 8DW0, 8DW4, 8DW7

  • PubMed Abstract: 

    DNA glycosylase MutY plays a critical role in suppression of mutations resulted from oxidative damage, as highlighted by cancer-association of the human enzyme. MutY requires a highly conserved catalytic Asp residue for excision of adenines misinserted opposite 8-oxo-7,8-dihydroguanine (OG). A nearby Asn residue hydrogen bonds to the catalytic Asp in structures of MutY and its mutation to Ser is an inherited variant in human MUTYH associated with colorectal cancer. We captured structural snapshots of N146S Geobacillus stearothermophilus MutY bound to DNA containing a substrate, a transition state analog and enzyme-catalyzed abasic site products to provide insight into the base excision mechanism of MutY and the role of Asn. Surprisingly, despite the ability of N146S to excise adenine and purine (P) in vitro, albeit at slow rates, N146S-OG:P complex showed a calcium coordinated to the purine base altering its conformation to inhibit hydrolysis. We obtained crystal structures of N146S Gs MutY bound to its abasic site product by removing the calcium from crystals of N146S-OG:P complex to initiate catalysis in crystallo or by crystallization in the absence of calcium. The product structures of N146S feature enzyme-generated β-anomer abasic sites that support a retaining mechanism for MutY-catalyzed base excision.


  • Organizational Affiliation

    Department of Chemistry, University of California, Davis, CA 95616, USA.


Macromolecules

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Adenine DNA glycosylase365Geobacillus stearothermophilusMutation(s): 1 
Gene Names: mutY
EC: 3.2.2.31
UniProt
Find proteins for P83847 (Geobacillus stearothermophilus)
Explore P83847 
Go to UniProtKB:  P83847
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP83847
Sequence Annotations
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  • Reference Sequence

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Entity ID: 2
MoleculeChains LengthOrganismImage
DNA (5'-D(*AP*AP*GP*AP*CP*(8OG)P*TP*GP*GP*AP*C)-3')11synthetic construct
Sequence Annotations
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  • Reference Sequence

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Entity ID: 3
MoleculeChains LengthOrganismImage
DNA (5'-D(P*GP*TP*CP*CP*AP*(AAB)P*GP*TP*CP*T)-3')11synthetic construct
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.49 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.231 
  • R-Value Observed: 0.232 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 37.64α = 90
b = 85.55β = 90
c = 141.17γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
Cootmodel building
XDSdata reduction
XSCALEdata scaling
PHENIXphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Science Foundation (NSF, United States)United States1905304
National Science Foundation (NSF, United States)United States1905249
National Science Foundation (NSF, United States)United States1610721
National Science Foundation (NSF, United States)United States1608934

Revision History  (Full details and data files)

  • Version 1.0: 2022-11-30
    Type: Initial release
  • Version 1.1: 2023-05-03
    Changes: Database references
  • Version 1.2: 2023-10-25
    Changes: Data collection, Refinement description