6P1M | pdb_00006p1m

Binary complex of human DNA Polymerase Mu with 1-nt gapped substrate containing template 8OG

• PDB DOI: https://doi.org/10.2210/pdb6P1M/pdb
• NAKB: 6P1M

• Classification: TRANSFERASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2019-05-20 Released: 2019-09-04 
• Deposition Author(s): Kaminski, A.M., Pedersen, L.C., Bebenek, K., Chiruvella, K.K., Ramsden, D.A., Kunkel, T.A.
• Funding Organization(s): National Institutes of Health/National Institute of Environmental Health Sciences (NIH/NIEHS)

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.65 Å
• R-Value Free: 
  0.190 (Depositor), 0.191 (DCC) 
• R-Value Work: 
  0.166 (Depositor), 0.168 (DCC) 
• R-Value Observed: 
  0.167 (Depositor) 

Starting Model: experimental

Literature

Unexpected behavior of DNA polymerase Mu opposite template 8-oxo-7,8-dihydro-2'-guanosine.

Kaminski, A.M., Chiruvella, K.K., Ramsden, D.A., Kunkel, T.A., Bebenek, K., Pedersen, L.C.

(2019) Nucleic Acids Res 47: 9410-9422

• PubMed: 31435651 
• DOI: https://doi.org/10.1093/nar/gkz680
• Primary Citation Related Structures: 
  6P1M, 6P1N, 6P1O, 6P1P, 6P1Q, 6P1R, 6P1S, 6P1T, 6P1U, 6P1V, 6P1W


• PubMed Abstract: 
  

  DNA double-strand breaks (DSBs) resulting from reactive oxygen species generated by exposure to UV and ionizing radiation are characterized by clusters of lesions near break sites. Such complex DSBs are repaired slowly, and their persistence can have severe consequences for human health. We have therefore probed DNA break repair containing a template 8-oxo-7,8-dihydro-2'-guanosine (8OG) by Family X Polymerase μ (Pol μ) in steady-state kinetics and cell-based assays. Pol μ tolerates 8OG-containing template DNA substrates, and the filled products can be subsequently ligated by DNA Ligase IV during Nonhomologous end-joining. Furthermore, Pol μ exhibits a strong preference for mutagenic bypass of 8OG by insertion of adenine. Crystal structures reveal that the template 8OG is accommodated in the Pol μ active site with none of the DNA substrate distortions observed for Family X siblings Pols β or λ. Kinetic characterization of template 8OG bypass indicates that Pol μ inserts adenosine nucleotides with weak sugar selectivity and, given the high cellular concentration of ATP, likely performs its role in repair of complex 8OG-containing DSBs using ribonucleotides.

---

Organizational Affiliation: 
• Genome Integrity and Structural Biology Laboratory, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC 27709, USA.
Department of Biochemistry and Biophysics, Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27709, USA.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly Evidence: gel filtration

Macromolecule Content 

• Total Structure Weight: 45.69 kDa 
• Atom Count: 3,408 
• Modeled Residue Count: 342 
• Deposited Residue Count: 371 
• Unique protein chains: 1
• Unique nucleic acid chains: 3

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
DNA-directed DNA/RNA polymerase mu	A	354	Homo sapiens	Mutation(s): 0  Gene Names: POLM, polmu 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 ID: 2
Molecule	Chains	Length	Organism	Image
DNA (5'-D(*CP*GP*GP*CP*(8OG)P*TP*AP*CP*G)-3')	B [auth T]	9	Homo sapiens

Entity ID: 3
Molecule	Chains	Length	Organism	Image
DNA (5'-D(*CP*GP*TP*A)-3')	C [auth P]	4	Homo sapiens

Entity ID: 4
Molecule	Chains	Length	Organism	Image
DNA (5'-D(P*GP*CP*CP*G)-3')	D	4	Homo sapiens

Small Molecules

Ligands 5 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
BR	E [auth A], H [auth A]	BROMIDE ION Br CPELXLSAUQHCOX-UHFFFAOYSA-M
EDO	K [auth A], L [auth A], M [auth A], N [auth A], O [auth A], P [auth A]	1,2-ETHANEDIOL C2 H6 O2 LYCAIKOWRPUZTN-UHFFFAOYSA-N
CO2	J [auth A]	CARBON DIOXIDE C O2 CURLTUGMZLYLDI-UHFFFAOYSA-N
K	F [auth A]	POTASSIUM ION K NPYPAHLBTDXSSS-UHFFFAOYSA-N
CL	G [auth A], I [auth A]	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.65 Å
• R-Value Free:  0.190 (Depositor), 0.191 (DCC) 
• R-Value Work:  0.166 (Depositor), 0.168 (DCC) 
• R-Value Observed: 0.167 (Depositor) 

Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 59.929	α = 90
b = 68.263	β = 90
c = 110.413	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
HKL-2000	data reduction
HKL-2000	data scaling
PHASER	phasing

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2019-09-04 
Deposition Author(s): Kaminski, A.M., Pedersen, L.C., Bebenek, K., Chiruvella, K.K., Ramsden, D.A., Kunkel, T.A.

---

Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of Environmental Health Sciences (NIH/NIEHS)	United States	1ZIA ES 102645

Revision History  

• Version 1.0: 2019-09-04
  Type: Initial release
  
• Version 1.1: 2019-10-09
  Changes: Data collection, Database references
• Version 1.2: 2019-12-18
  Changes: Author supporting evidence
• Version 1.3: 2023-10-11
  Changes: Data collection, Database references, Derived calculations, Refinement description