1EEF

HEAT-LABILE ENTEROTOXIN B-PENTAMER COMPLEXED WITH BOUND LIGAND PEPG

• PDB DOI: https://doi.org/10.2210/pdb1EEF/pdb

• Classification: TOXIN
• Organism(s): Escherichia coli
• 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: 1.80 Å
• R-Value Free: 0.267 
• R-Value Work: 0.182 
• R-Value Observed: 0.182 

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)

Biological Assembly 2  

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

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 120.94 kDa 
• Atom Count: 9,523 
• Modelled Residue Count: 1,030 
• Deposited Residue Count: 1,030 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PROTEIN (HEAT-LABILE ENTEROTOXIN B CHAIN)	A [auth D], B [auth E], C [auth F], D [auth G], E [auth H], F [auth L], G [auth M], H [auth N], I [auth O], J [auth P]	103	Escherichia coli	Mutation(s): 0
UniProt
Find proteins for P32890 (Escherichia coli) Explore P32890  Go to UniProtKB:  P32890

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
I06	O [auth G], Q [auth H], V [auth O], X [auth P]	2-PHENETHYL-2,3-DIHYDRO-PHTHALAZINE-1,4-DIONE C16 H14 N2 O2 JSSVIGGKHIJEHO-UHFFFAOYSA-N
GLA	K [auth D], L [auth E], M [auth F], N [auth G], P [auth H], R [auth L], S [auth M], T [auth N], U [auth O], W [auth P]	alpha-D-galactopyranose C6 H12 O6 WQZGKKKJIJFFOK-PHYPRBDBSA-N

Binding Affinity Annotations
ID	Source	Binding Affinity
GLA	Binding MOAD:  1EEF	IC50: 1.20e+6 (nM) from 1 assay(s)

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 0.267 
• R-Value Work: 0.182 
• R-Value Observed: 0.182 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 88.54	α = 90
b = 65.02	β = 115.47
c = 101.93	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: 2024-04-03
  Changes: Data collection, Database references, Refinement description, Structure summary