1EEI

CHOLERA TOXIN B-PENTAMER COMPLEXED WITH METANITROPHENYL-ALPHA-D-GALACTOSE

• PDB DOI: https://doi.org/10.2210/pdb1EEI/pdb

• Classification: TOXIN
• Organism(s): Vibrio cholerae
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2000-01-31 Released: 2000-02-16 
• Deposition Author(s): Merritt, E.A., Hol, W.G.J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.251 
• R-Value Work: 0.200 
• R-Value Observed: 0.200 

Biological Assembly 1  

Global Symmetry: Cyclic - C5  (Explore in 3D)
Global Stoichiometry: Homo 5-mer - A5 

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

Macromolecule Content

• Total Structure Weight: 59.62 kDa 
• Atom Count: 4,630 
• Modelled Residue Count: 515 
• Deposited Residue Count: 515 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PROTEIN (CHOLERA TOXIN B)	A [auth D], B [auth E], C [auth F], D [auth G], E [auth H]	103	Vibrio cholerae	Mutation(s): 0
UniProt
Find proteins for Q57193 (Vibrio cholerae) Explore Q57193  Go to UniProtKB:  Q57193

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
GAA	F [auth D], G [auth E], H [auth F], I [auth G], J [auth H]	3-nitrophenyl alpha-D-galactopyranoside C12 H15 N O8 VCCMGHVCRFMITI-IIRVCBMXSA-N

Binding Affinity Annotations
ID	Source	Binding Affinity
GAA	Binding MOAD:  1EEI	IC50: 7.00e+5 (nM) from 1 assay(s)
	PDBBind:  1EEI	IC50: 7.00e+5 (nM) from 1 assay(s)

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.251 
• R-Value Work: 0.200 
• R-Value Observed: 0.200 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 68.9	α = 90
b = 69.55	β = 90
c = 130.66	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
AMoRE	phasing
X-PLOR	refinement

Structure Validation

Entry History 

Deposition Data

• Released Date: 2000-02-16 
Deposition Author(s): Merritt, E.A., Hol, W.G.J.

Revision History  

• Version 1.0: 2000-02-16
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Data collection, Derived calculations, Structure summary
• Version 1.4: 2023-08-09
  Changes: Data collection, Database references, Refinement description, Structure summary