7COA

Ternary complex of DNA polymerase Mu with 1-nt gapped DNA (T:dGMPNPP) and Mn


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.199 
  • R-Value Work: 0.175 
  • R-Value Observed: 0.176 

Starting Model: experimental
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Literature

Mechanism of genome instability mediated by human DNA polymerase mu misincorporation.

Guo, M.Wang, Y.Tang, Y.Chen, Z.Hou, J.Dai, J.Wang, Y.Wang, L.Xu, H.Tian, B.Hua, Y.Zhao, Y.

(2021) Nat Commun 12: 3759-3759

  • DOI: https://doi.org/10.1038/s41467-021-24096-7
  • Primary Citation of Related Structures:  
    7CO6, 7CO8, 7CO9, 7COA, 7COB, 7COC, 7COD

  • PubMed Abstract: 

    Pol μ is capable of performing gap-filling repair synthesis in the nonhomologous end joining (NHEJ) pathway. Together with DNA ligase, misincorporation of dGTP opposite the templating T by Pol μ results in a promutagenic T:G mispair, leading to genomic instability. Here, crystal structures and kinetics of Pol μ substituting dGTP for dATP on gapped DNA substrates containing templating T were determined and compared. Pol μ is highly mutagenic on a 2-nt gapped DNA substrate, with T:dGTP base pairing at the 3' end of the gap. Two residues (Lys438 and Gln441) interact with T:dGTP and fine tune the active site microenvironments. The in-crystal misincorporation reaction of Pol μ revealed an unexpected second dGTP in the active site, suggesting its potential mutagenic role among human X family polymerases in NHEJ.


  • Organizational Affiliation

    Institute of Biophysics, College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang, China.


Macromolecules

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed DNA/RNA polymerase mu482Homo sapiensMutation(s): 1 
Gene Names: POLMpolmu
EC: 2.7.7.7
UniProt & NIH Common Fund Data Resources
Find proteins for Q9NP87 (Homo sapiens)
Explore Q9NP87 
Go to UniProtKB:  Q9NP87
PHAROS:  Q9NP87
GTEx:  ENSG00000122678 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9NP87
Sequence Annotations
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  • Reference Sequence

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Entity ID: 2
MoleculeChains LengthOrganismImage
DNA (5'-D(*CP*GP*GP*CP*TP*TP*AP*CP*G)-3')B [auth T]9synthetic construct
Sequence Annotations
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  • Reference Sequence

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Entity ID: 3
MoleculeChains LengthOrganismImage
DNA (5'-D(*CP*GP*TP*A)-3')C [auth P]4synthetic construct
Sequence Annotations
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  • Reference Sequence

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Entity ID: 4
MoleculeChains LengthOrganismImage
DNA (5'-D(P*GP*CP*CP*G)-3')4synthetic construct
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.199 
  • R-Value Work: 0.175 
  • R-Value Observed: 0.176 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 59.95α = 90
b = 68.57β = 90
c = 110.81γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XSCALEdata scaling
PDB_EXTRACTdata extraction
XDSdata reduction
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science Foundation of China (NSFC)China31670819

Revision History  (Full details and data files)

  • Version 1.0: 2021-06-30
    Type: Initial release
  • Version 1.1: 2023-11-29
    Changes: Data collection, Database references, Refinement description