2OQ4

Crystal structure of the DNA repair enzyme endonuclease-VIII (Nei) from E. coli (E2Q) in complex with AP-site containing DNA substrate

• PDB DOI: https://doi.org/10.2210/pdb2OQ4/pdb
• NAKB: 2OQ4

• Classification: HYDROLASE/DNA
• Organism(s): Escherichia coli
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2007-01-31 Released: 2008-02-26 
• Deposition Author(s): Golan, G., Zharkov, D.O., Grollman, A.P., Shoahm, G.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.60 Å
• R-Value Free: 0.432 
• R-Value Work: 0.374 
• R-Value Observed: 0.374 

Starting Model: experimental

Literature

Active site plasticity of endonuclease VIII: Conformational changes compensating for different substrates and mutations of critical residues

Golan, G., Zharkov, D.O., Grollman, A.P., Shoham, G.

To be published.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Biological Assembly 2  

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

Biological assembly 2 assigned by authors.

Macromolecule Content

• Total Structure Weight: 75.74 kDa 
• Atom Count: 4,976 
• Modelled Residue Count: 545 
• Deposited Residue Count: 576 
• Unique protein chains: 1
• Unique nucleic acid chains: 2

Macromolecules

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Endonuclease VIII	E [auth A], F [auth B]	262	Escherichia coli	Mutation(s): 1  Gene Names: Nei EC: 3.2.2 (PDB Primary Data), 4.2.99.18 (PDB Primary Data)
UniProt
Find proteins for P50465 (Escherichia coli (strain K12)) Explore P50465  Go to UniProtKB:  P50465

Entity ID: 1
Molecule	Chains	Length	Organism	Image
5'-D(*G*GP*CP*TP*TP*CP*AP*TP*CP*CP*TP*GP*G)-3'	A [auth C], C [auth E]	13	N/A

Entity ID: 2
Molecule	Chains	Length	Organism	Image
5'-D(*C*CP*AP*GP*GP*AP*(PED)P*GP*AP*AP*GP*CP*C)-3'	B [auth D], D [auth F]	13	N/A

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	I [auth A], K [auth B], L [auth B]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
ZN	H [auth A], J [auth B]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N
NA	G [auth F], M [auth B]	SODIUM ION Na FKNQFGJONOIPTF-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.60 Å
• R-Value Free: 0.432 
• R-Value Work: 0.374 
• R-Value Observed: 0.374 
• Space Group: P 4₃ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 107.13	α = 90
b = 107.13	β = 90
c = 164.86	γ = 90

Software Package:

Software Name	Purpose
CNS	refinement
d*TREK	data reduction
d*TREK	data scaling
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2008-02-26 
Deposition Author(s): Golan, G., Zharkov, D.O., Grollman, A.P., Shoahm, G.

Revision History  

• Version 1.0: 2008-02-26
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2021-11-10
  Changes: Database references, Derived calculations
• Version 1.3: 2023-10-25
  Changes: Data collection, Refinement description
• Version 1.4: 2024-10-30
  Changes: Structure summary