6HJD

Cholera toxin classical B-pentamer in complex with Lewis-x

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.54 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.194 

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Literature

Crystal structures of cholera toxin in complex with fucosylated receptors point to importance of secondary binding site.

Heim, J.B., Hodnik, V., Heggelund, J.E., Anderluh, G., Krengel, U.

(2019) Sci Rep 9: 12243-12243

  • DOI: 10.1038/s41598-019-48579-2
  • Primary Citation of Related Structures:  
    6HJD, 6HMW, 6HMY

  • PubMed Abstract: 

    • Cholera is a life-threatening diarrhoeal disease caused by the human pathogen Vibrio cholerae. Infection occurs after ingestion of the bacteria, which colonize the human small intestine and secrete their major virulence factor - the cholera toxin (CT). The GM1 ganglioside is considered the primary receptor of the CT, but recent studies suggest that also fucosylated receptors such as histo-blood group antigens are important for cellular uptake and toxicity ...

    Cholera is a life-threatening diarrhoeal disease caused by the human pathogen Vibrio cholerae. Infection occurs after ingestion of the bacteria, which colonize the human small intestine and secrete their major virulence factor - the cholera toxin (CT). The GM1 ganglioside is considered the primary receptor of the CT, but recent studies suggest that also fucosylated receptors such as histo-blood group antigens are important for cellular uptake and toxicity. Recently, a special focus has been on the histo-blood group antigen Lewis x (Le x ), however, where and how the CT binds to Le x remains unclear. Here we report the high-resolution crystal structure (1.5 Å) of the receptor-binding B-subunits of the CT bound to the Le x trisaccharide, and complementary quantitative binding data for CT holotoxins. Le x , and also L-fucose alone, bind to the secondary binding site of the toxin, distinct from the GM1 binding site. In contrast, fucosyl-GM1 mainly binds to the primary binding site due to high-affinity interactions of its GM1 core. Le x is the first histo-blood group antigen of non-secretor phenotype structurally investigated in complex with CT. Together with the quantitative binding data, this allows unique insight into why individuals with non-secretor phenotype are more prone to severe cholera than so-called 'secretors'.

    Organizational Affiliation: 

    Department of Chemistry, University of Oslo, P.O. Box 1033, NO-0315, Blindern, Norway. ute.krengel@kjemi.uio.no.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Cholera toxin B subunit
A, B, C, D, E, F, G, H
A, B, C, D, E, F, G, H, I, J
103Vibrio choleraeMutation(s): 0 
Gene Names: ctxB
UniProt
Find proteins for P01556 (Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961))
Explore P01556 
Go to UniProtKB:  P01556
Protein Feature View
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  • Reference Sequence
Oligosaccharides

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Entity ID: 2
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
alpha-L-fucopyranose-(1-3)-[beta-D-galactopyranose-(1-4)]2-acetamido-2-deoxy-alpha-D-glucopyranoseK, L, N, P, Q, R3N/A Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G51591NI
GlyCosmos:  G51591NI
GlyGen:  G51591NI
Entity ID: 3
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
alpha-L-fucopyranose-(1-3)-[beta-D-galactopyranose-(1-4)]2-acetamido-2-deoxy-beta-D-glucopyranoseM, O3N/A Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G00051MO
GlyCosmos:  G00051MO
GlyGen:  G00051MO
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FUC (Subject of Investigation/LOI)
Query on FUC
Download Ideal Coordinates CCD File 
 DA [auth F]alpha-L-fucopyranose
C6 H12 O5
SHZGCJCMOBCMKK-SXUWKVJYSA-N		 Ligand Interaction
BCN (Subject of Investigation/LOI)
Query on BCN
Download Ideal Coordinates CCD File 
CA [auth F] , FA [auth G] , GA [auth G] , JA [auth I] , KA [auth I] , MA [auth J] , T [auth A] , V [auth B] , 
CA [auth F],  FA [auth G],  GA [auth G],  JA [auth I],  KA [auth I],  MA [auth J],  T [auth A],  V [auth B],  Y [auth D],  Z [auth D]
BICINE
C6 H13 N O4
FSVCELGFZIQNCK-UHFFFAOYSA-N		 Ligand Interaction
CA
Query on CA
Download Ideal Coordinates CCD File 
AA [auth E] , BA [auth F] , EA [auth G] , HA [auth H] , IA [auth I] , LA [auth J] , S [auth A] , U [auth B] , 
AA [auth E],  BA [auth F],  EA [auth G],  HA [auth H],  IA [auth I],  LA [auth J],  S [auth A],  U [auth B],  W [auth C],  X [auth D]
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N		 Ligand Interaction
Biologically Interesting Molecules (External Reference) 2 Unique
Entity ID: 2
IDChainsNameType/Class2D Diagram3D Interactions
PRD_900120
Query on PRD_900120		K, L, N, P, Q, RLewis X antigen, alpha anomerOligosaccharide /  Antigen Ligand Interaction
Entity ID: 3
IDChainsNameType/Class2D Diagram3D Interactions
PRD_900119
Query on PRD_900119		M, OLewis X antigen, beta anomerOligosaccharide /  Antigen Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.54 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.194 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 82.965α = 90
b = 108.291β = 90
c = 115.621γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
PHENIXrefinement
Cootmodel building
xia2data reduction
DIALSdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Research Council of NorwayNorway247730

Revision History  (Full details and data files)

  • Version 1.0: 2019-08-14
    Type: Initial release
  • Version 1.1: 2019-10-02
    Changes: Data collection, Database references
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Structure summary