5ELC

Cholera toxin El Tor B-pentamer in complex with Lewis-y


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.223 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 2.1 of the entry. See complete history


Literature

High-Resolution Crystal Structures Elucidate the Molecular Basis of Cholera Blood Group Dependence.

Heggelund, J.E.Burschowsky, D.Bjrnestad, V.A.Hodnik, V.Anderluh, G.Krengel, U.

(2016) PLoS Pathog 12: e1005567-e1005567

  • DOI: https://doi.org/10.1371/journal.ppat.1005567
  • Primary Citation of Related Structures:  
    5ELB, 5ELC, 5ELD, 5ELE, 5ELF

  • PubMed Abstract: 

    Cholera is the prime example of blood-group-dependent diseases, with individuals of blood group O experiencing the most severe symptoms. The cholera toxin is the main suspect to cause this relationship. We report the high-resolution crystal structures (1.1-1.6 Å) of the native cholera toxin B-pentamer for both classical and El Tor biotypes, in complexes with relevant blood group determinants and a fragment of its primary receptor, the GM1 ganglioside. The blood group A determinant binds in the opposite orientation compared to previously published structures of the cholera toxin, whereas the blood group H determinant, characteristic of blood group O, binds in both orientations. H-determinants bind with higher affinity than A-determinants, as shown by surface plasmon resonance. Together, these findings suggest why blood group O is a risk factor for severe cholera.


  • Organizational Affiliation

    Department of Chemistry, University of Oslo, Blindern, Norway.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cholera enterotoxin subunit B
A, B, C, D, E
A, B, C, D, E, F, G, H, I, J
103Vibrio cholerae O1Mutation(s): 0 
Gene Names: ctxBtoxBVC_1456
UniProt
Find proteins for P01556 (Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961))
Explore P01556 
Go to UniProtKB:  P01556
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP01556
Sequence Annotations
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
alpha-L-fucopyranose-(1-2)-beta-D-galactopyranose-(1-4)-[alpha-L-fucopyranose-(1-3)]2-acetamido-2-deoxy-alpha-D-glucopyranose
K, O, Q, S
4N/A
Glycosylation Resources
GlyTouCan:  G82236PZ
GlyCosmos:  G82236PZ
GlyGen:  G82236PZ
Entity ID: 3
MoleculeChains Length2D Diagram Glycosylation3D Interactions
alpha-L-fucopyranose-(1-2)-beta-D-galactopyranose-(1-4)-[alpha-L-fucopyranose-(1-3)]2-acetamido-2-deoxy-alpha-D-glucopyranose
L, M, R
5N/A
Glycosylation Resources
GlyTouCan:  G82236PZ
GlyCosmos:  G82236PZ
GlyGen:  G82236PZ
Entity ID: 4
MoleculeChains Length2D Diagram Glycosylation3D Interactions
alpha-L-fucopyranose-(1-2)-beta-D-galactopyranose-(1-4)-[alpha-L-fucopyranose-(1-3)]2-acetamido-2-deoxy-beta-D-glucopyranose
N, P
4N/A
Glycosylation Resources
GlyTouCan:  G00052MO
GlyCosmos:  G00052MO
GlyGen:  G00052MO
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
FUC
Query on FUC

Download Ideal Coordinates CCD File 
NA [auth F]alpha-L-fucopyranose
C6 H12 O5
SHZGCJCMOBCMKK-SXUWKVJYSA-N
BCN
Query on BCN

Download Ideal Coordinates CCD File 
CA [auth C]
EA [auth C]
FA [auth D]
HA [auth D]
KA [auth E]
CA [auth C],
EA [auth C],
FA [auth D],
HA [auth D],
KA [auth E],
MA [auth E],
U [auth A],
W [auth A],
X [auth B],
Z [auth B]
BICINE
C6 H13 N O4
FSVCELGFZIQNCK-UHFFFAOYSA-N
CA
Query on CA

Download Ideal Coordinates CCD File 
AA [auth B]
BA [auth C]
DA [auth C]
GA [auth D]
IA [auth D]
AA [auth B],
BA [auth C],
DA [auth C],
GA [auth D],
IA [auth D],
JA [auth E],
LA [auth E],
T [auth A],
V [auth A],
Y [auth B]
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.223 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 63.667α = 90
b = 80.916β = 96.07
c = 95.77γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XDSdata scaling
MOLREPphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-03-30
    Type: Initial release
  • Version 1.1: 2016-04-27
    Changes: Database references
  • Version 1.2: 2018-11-21
    Changes: Data collection, Source and taxonomy
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Structure summary
  • Version 2.1: 2024-01-10
    Changes: Data collection, Database references, Refinement description, Structure summary