9I04 | pdb_00009i04

Ku70/80, DNA bound to Polymerase Mu

• PDB DOI: https://doi.org/10.2210/pdb9I04/pdb
• EM Map EMD-52550: EMDB EMDataResource
• NAKB: 9I04

• Classification: DNA BINDING PROTEIN
• Organism(s): Homo sapiens
• Expression System: Spodoptera frugiperda, Escherichia coli
• Mutation(s): No 


• Deposited: 2025-01-14 Released: 2025-12-17 
• Deposition Author(s): Chaplin, A.K., Amin, H.
• Funding Organization(s): Medical Research Council (MRC, United Kingdom), The Lister Institute of Preventive Medicine

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 4.05 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

DNA polymerase Lambda and Mu are anchored via Ku70/80

Chaplin, A.K., Amin, H.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 3-mer - A1B1C1 

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

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 135.88 kDa 
• Atom Count: 9,469 
• Modeled Residue Count: 1,146 
• Deposited Residue Count: 1,146 
• Unique protein chains: 3
• Unique nucleic acid chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
X-ray repair cross-complementing protein 6	A	493	Homo sapiens	Mutation(s): 0  Gene Names: XRCC6, G22P1 EC: 3.6.4 (PDB Primary Data), 4.2.99 (PDB Primary Data), 5.6.2.4 (UniProt), 4.2.99.18 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for P12956 (Homo sapiens) Explore P12956  Go to UniProtKB:  P12956
PHAROS:  P12956 GTEx:  ENSG00000196419

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
X-ray repair cross-complementing protein 5	B	532	Homo sapiens	Mutation(s): 0  Gene Names: XRCC5, G22P2 EC: 3.6.4 (PDB Primary Data), 5.6.2.4 (UniProt), 4.2.99.18 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for P13010 (Homo sapiens) Explore P13010  Go to UniProtKB:  P13010
PHAROS:  P13010 GTEx:  ENSG00000079246

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
DNA-directed DNA/RNA polymerase mu	C	93	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: 4
Molecule	Chains	Length	Organism	Image
DNA (5'-D(P*GP*GP*TP*GP*CP*AP*GP*CP*AP*CP*AP*GP*TP*G)-3')	D	14	Homo sapiens

Entity ID: 5
Molecule	Chains	Length	Organism	Image
DNA (5'-D(P*GP*CP*AP*CP*TP*GP*TP*GP*CP*TP*GP*CP*AP*C)-3')	E	14	Homo sapiens

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 4.05 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2025-12-17 
Deposition Author(s): Chaplin, A.K., Amin, H.

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Funding Organization	Location	Grant Number
Medical Research Council (MRC, United Kingdom)	United Kingdom	MR/X00029X/1
The Lister Institute of Preventive Medicine	United Kingdom	--

Revision History  

• Version 1.0: 2025-12-17
  Type: Initial release