Binary Complex of Human DNA Polymerase Mu with MgdGTP

Experimental Data Snapshot

  • Resolution: 1.60 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.209 

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Human DNA Polymerase mu Can Use a Noncanonical Mechanism for Multiple Mn2+-Mediated Functions.

Chang, Y.K.Huang, Y.P.Liu, X.X.Ko, T.P.Bessho, Y.Kawano, Y.Maestre-Reyna, M.Wu, W.J.Tsai, M.D.

(2019) J Am Chem Soc 141: 8489-8502

  • DOI: https://doi.org/10.1021/jacs.9b01741
  • Primary Citation of Related Structures:  
    5ZLC, 6AEC, 6AEH, 6AK5, 6AK6, 6AK8, 6AK9, 6AKH, 6IPD, 6IPE, 6IPF, 6IPG, 6IPH, 6IPI, 6IPJ, 6IPK, 6IPL, 6IPM, 6IPN

  • PubMed Abstract: 

    Recent research on the structure and mechanism of DNA polymerases has continued to generate fundamentally important features, including a noncanonical pathway involving "prebinding" of metal-bound dNTP (MdNTP) in the absence of DNA. While this noncanonical mechanism was shown to be a possible subset for African swine fever DNA polymerase X (Pol X) and human Pol λ, it remains unknown whether it could be the primary pathway for a DNA polymerase. Pol μ is a unique member of the X-family with multiple functions and with unusual Mn 2+ preference. Here we report that Pol μ not only prebinds MdNTP in a catalytically active conformation but also exerts a Mn 2+ over Mg 2+ preference at this early stage of catalysis, for various functions: incorporation of dNTP into a single nucleotide gapped DNA, incorporation of rNTP in the nonhomologous end joining (NHEJ) repair, incorporation of dNTP to an ssDNA, and incorporation of an 8-oxo-dGTP opposite template dA (mismatched) or dC (matched). The structural basis of this noncanonical mechanism and Mn 2+ over Mg 2+ preference in these functions was analyzed by solving 19 structures of prebinding binary complexes, precatalytic ternary complexes, and product complexes. The results suggest that the noncanonical pathway is functionally relevant for the multiple functions of Pol μ. Overall, this work provides the structural and mechanistic basis for the long-standing puzzle in the Mn 2+ preference of Pol μ and expands the landscape of the possible mechanisms of DNA polymerases to include both mechanistic pathways.

  • Organizational Affiliation

    Institute of Biological Chemistry, Academia Sinica , 128 Academia Road Sec. 2 , Nankang, Taipei 115 , Taiwan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed DNA/RNA polymerase mu356Homo sapiensMutation(s): 0 
Gene Names: POLMpolmu
UniProt & NIH Common Fund Data Resources
Find proteins for Q9NP87 (Homo sapiens)
Explore Q9NP87 
Go to UniProtKB:  Q9NP87
GTEx:  ENSG00000122678 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9NP87
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
DGT (Subject of Investigation/LOI)
Query on DGT

Download Ideal Coordinates CCD File 
C10 H16 N5 O13 P3
Query on SO4

Download Ideal Coordinates CCD File 
D [auth A]
E [auth A]
F [auth A]
G [auth A]
H [auth A]
D [auth A],
E [auth A],
F [auth A],
G [auth A],
H [auth A],
I [auth A]
O4 S
MG (Subject of Investigation/LOI)
Query on MG

Download Ideal Coordinates CCD File 
Experimental Data & Validation

Experimental Data

  • Resolution: 1.60 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.209 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 124.776α = 90
b = 124.776β = 90
c = 50.549γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-05-29
    Type: Initial release
  • Version 1.1: 2019-06-12
    Changes: Data collection, Database references
  • Version 1.2: 2024-03-27
    Changes: Data collection, Database references, Derived calculations