8IK8

Structure of DNA binding domain of McrBC endonuclease bound to DNA: L68F mutant

• PDB DOI: https://doi.org/10.2210/pdb8IK8/pdb
• NAKB: 8IK8

• Classification: DNA BINDING PROTEIN
• Organism(s): Escherichia coli K-12, DNA molecule
• Expression System: Escherichia coli BL21
• Mutation(s): Yes 


• Deposited: 2023-02-28 Released: 2024-02-28 
• Deposition Author(s): Adhav, V.A., Saikrishnan, K.
• Funding Organization(s): Not funded

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 0.222 
• R-Value Work: 0.184 
• R-Value Observed: 0.186 

Starting Model: experimental

Literature

Structural basis of target recognition by the DNA binding domain of McrBC

Adhav, V.A., Saikrishnan, K.

To be published.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

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

Macromolecule Content

• Total Structure Weight: 47.75 kDa 
• Atom Count: 3,346 
• Modelled Residue Count: 332 
• Deposited Residue Count: 366 
• Unique protein chains: 1
• Unique nucleic acid chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Type IV methyl-directed restriction enzyme EcoKMcrB subunit	A, B	170	Escherichia coli K-12	Mutation(s): 1  Gene Names: mcrB, rglB, b4346, JW5871 EC: 3.1.21
UniProt
Find proteins for P15005 (Escherichia coli (strain K12)) Explore P15005  Go to UniProtKB:  P15005

Entity ID: 2
Molecule	Chains	Length	Organism	Image
DNA (5'-D(*GP*AP*GP*AP*CP*CP*GP*GP*TP*AP*GP*C)-3')	C	13	DNA molecule

Entity ID: 3
Molecule	Chains	Length	Organism	Image
DNA (5'-D(*GP*CP*TP*AP*CP*CP*GP*GP*TP*CP*TP*C)-3')	D	13	DNA molecule

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
BTB	E [auth C], F [auth D]	2-[BIS-(2-HYDROXY-ETHYL)-AMINO]-2-HYDROXYMETHYL-PROPANE-1,3-DIOL C8 H19 N O5 OWMVSZAMULFTJU-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 0.222 
• R-Value Work: 0.184 
• R-Value Observed: 0.186 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 74.662	α = 90
b = 36.123	β = 98.633
c = 142.805	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
XDS	data reduction
SCALA	data scaling
PHASER	phasing
Coot	model building

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2024-02-28 
Deposition Author(s): Adhav, V.A., Saikrishnan, K.

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Funding Organization	Location	Grant Number
Not funded		--

Revision History  

• Version 1.0: 2024-02-28
  Type: Initial release