8OXS

Cholera holotoxin variant (chimera with E. coli heat-labile enterotoxin, 4 C-terminal substitutions)

• PDB DOI: https://doi.org/10.2210/pdb8OXS/pdb

• Classification: TOXIN
• Organism(s): Vibrio cholerae O1
• Expression System: Vibrio natriegens
• Mutation(s): Yes 


• Deposited: 2023-05-02 Released: 2024-08-14 
• Deposition Author(s): Kersten, F., Heim, J.B., Cordara, G., Krengel, U.
• Funding Organization(s): National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å
• R-Value Free: 0.224 
• R-Value Work: 0.193 

Starting Model: experimental

Literature

Cholera toxin variants

Heim, J.B., Serrano, A., Kersten, F., Mojica, N., Cordara, G., Tatulian, S.A., Krengel, U., Teter, K.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 6-mer - A5B1 Local Symmetry: Cyclic - C5  (Explore in 3D)
Local Stoichiometry: Homo 5-mer - A5 

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

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Biological Assembly 2  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 6-mer - A5B1 Local Symmetry: Cyclic - C5  (Explore in 3D)
Local Stoichiometry: Homo 5-mer - A5 

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

Biological assembly 2 assigned by authors.

Macromolecule Content

• Total Structure Weight: 174.83 kDa 
• Atom Count: 13,700 
• Modelled Residue Count: 1,492 
• Deposited Residue Count: 1,510 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Cholera enterotoxin subunit A	A, G [auth B]	240	Vibrio cholerae O1	Mutation(s): 4  Gene Names: ctxA, toxA, VC_1457
UniProt
Find proteins for P01555 (Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961)) Explore P01555  Go to UniProtKB:  P01555

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Cholera enterotoxin subunit B	B [auth D], C [auth E], D [auth F], E [auth G], F [auth H], H [auth C], I, J, K, L	103	Vibrio cholerae O1	Mutation(s): 2  Gene Names: ctxB, toxB, VC_1456
UniProt
Find proteins for P01556 (Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961)) Explore P01556  Go to UniProtKB:  P01556

Small Molecules

Ligands 4 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
EPE	AA [auth B], DA [auth I], Q [auth E], W [auth H]	4-(2-HYDROXYETHYL)-1-PIPERAZINE ETHANESULFONIC ACID C8 H18 N2 O4 S JKMHFZQWWAIEOD-UHFFFAOYSA-N
GLA	BA [auth C], FA [auth K], HA [auth L], O [auth D], R [auth E], V [auth G], Y [auth H]	alpha-D-galactopyranose C6 H12 O6 WQZGKKKJIJFFOK-PHYPRBDBSA-N
GAL	CA [auth C], EA [auth I], GA [auth K], IA [auth L], N [auth A], P [auth D], S [auth E], T [auth F], U [auth G], X [auth H]	beta-D-galactopyranose C6 H12 O6 WQZGKKKJIJFFOK-FPRJBGLDSA-N
NA	M [auth A], Z [auth B]	SODIUM ION Na FKNQFGJONOIPTF-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å
• R-Value Free: 0.224 
• R-Value Work: 0.193 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 60.295	α = 90
b = 89.61	β = 98.186
c = 141.094	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
XDS	data reduction
XDS	data scaling
PHASER	phasing
Coot	model building
MxCuBE	data collection

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2024-08-14 
Deposition Author(s): Kersten, F., Heim, J.B., Cordara, G., Krengel, U.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)	United States	R03AI112854
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)	United States	R01AI137056

Revision History  

• Version 1.0: 2024-08-14
  Type: Initial release