1E44

ribonuclease domain of colicin E3 in complex with its immunity protein

• PDB DOI: https://doi.org/10.2210/pdb1E44/pdb

• Classification: RIBONUCLEASE
• Organism(s): Escherichia coli
• Expression System: Escherichia coli BL21(DE3), Escherichia coli BL21
• Mutation(s): No 


• Deposited: 2000-06-28 Released: 2001-06-28 
• Deposition Author(s): Carr, S., Walker, D., James, R., Kleanthous, C., Hemmings, A.M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.40 Å
• R-Value Free: 0.228 
• R-Value Work: 0.192 
• R-Value Observed: 0.192 

Literature

Inhibition of a Ribosome Inactivating Ribonuclease: The Crystal Structure of the Cytotoxic Domain of Colicin E3 in Complex with its Immunity Protein

Carr, S., Walker, D., James, R., Kleanthous, C., Hemmings, A.M.

(2000) Structure 8: 949

• PubMed: 10986462 
• DOI: https://doi.org/10.1016/s0969-2126(00)00186-6
• Primary Citation of Related Structures:  
  1E44


• PubMed Abstract: 
  

  The cytotoxicity of most ribonuclease E colicins towards Escherichia coli arises from their ability to specifically cleave between bases 1493 and 1494 of 16S ribosomal RNA. This activity is carried by the C-terminal domain of the colicin, an activity which if left unneutralised would lead to destruction of the producing cell. To combat this the host E. coli cell produces an inhibitor protein, the immunity protein, which forms a complex with the ribonuclease domain effectively suppressing its activity.

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Organizational Affiliation: 

Colicin Research Group, School of Chemical Sciences, University of East Anglia, NR4 7TJ, Norwich, UK.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 generated by PQS (software)

Macromolecule Content

• Total Structure Weight: 20.78 kDa 
• Atom Count: 1,633 
• Modelled Residue Count: 180 
• Deposited Residue Count: 181 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
IMMUNITY PROTEIN	A	85	Escherichia coli	Mutation(s): 0
UniProt
Find proteins for P02984 (Escherichia coli) Explore P02984  Go to UniProtKB:  P02984

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
COLICIN E3	B	96	Escherichia coli	Mutation(s): 0
UniProt
Find proteins for P00646 (Escherichia coli) Explore P00646  Go to UniProtKB:  P00646

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
EDO	C [auth B]	1,2-ETHANEDIOL C2 H6 O2 LYCAIKOWRPUZTN-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.40 Å
• R-Value Free: 0.228 
• R-Value Work: 0.192 
• R-Value Observed: 0.192 
• Space Group: P 3₁ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 93.7	α = 90
b = 93.7	β = 90
c = 76.17	γ = 120

Software Package:

Software Name	Purpose
CNS	refinement
DENZO	data reduction
SCALA	data scaling
SOLVE	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2001-06-28 
Deposition Author(s): Carr, S., Walker, D., James, R., Kleanthous, C., Hemmings, A.M.

Revision History  

• Version 1.0: 2001-06-28
  Type: Initial release
  
• Version 1.1: 2011-05-08
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance