1TET | pdb_00001tet

CRYSTAL STRUCTURE OF AN ANTICHOLERA TOXIN PEPTIDE COMPLEX AT 2.3 ANGSTROMS

• PDB DOI: https://doi.org/10.2210/pdb1TET/pdb

• Classification: IMMUNOGLOBULIN
• Organism(s): Mus musculus, Escherichia coli
• Mutation(s): No 


• Deposited: 1993-06-21 Released: 1994-01-31 
• Deposition Author(s): Shoham, M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Work: 
  0.148 (Depositor) 
• R-Value Observed: 
  0.148 (Depositor) 

Literature

Crystal structure of an anticholera toxin peptide complex at 2.3 A.

Shoham, M.

(1993) J Mol Biology 232: 1169-1175

• PubMed: 7690406 
• DOI: https://doi.org/10.1006/jmbi.1993.1469
• Primary Citation Related Structures: 
  1TET


• PubMed Abstract: 
  

  Cholera toxin peptide 3 (CTP3) is a 15-residue peptide corresponding in sequence to an immunogenic loop on the surface of the B-subunits of both cholera toxin and the heat-labile toxin from Escherichia coli. TE33 is the Fab fragment of a monoclonal antibody elicited against CTP3. The crystal structure of the TE33-CTP3 complex at 2.3 A resolution reveals an antigen-binding pocket, 13 A deep and 13 A wide, which is lined with many aromatic residues. The N-terminal portion of the peptide antigen CTP3 forms a type II beta-turn that fits snugly into this pocket. At gln7 the peptide backbone of CTP3 forms a kink followed by an extended C-terminal chain that seals off the cleft and buries the beta-turn underneath it. All six complementarity-determining regions of TE33 contribute to the binding of CTP3. The antibody-peptide contacts include, in addition to van der Waals' interactions and hydrogen bonds, also one salt bridge and one water molecule, which mediates the interaction.

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Organizational Affiliation: 
• Case Western Reserve University, School of Medicine, Department of Biochemistry, Cleveland, OH 44106-4935.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 3-mer - A1B1C1 

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

Macromolecule Content 

• Total Structure Weight: 48.5 kDa 
• Atom Count: 3,541 
• Modeled Residue Count: 438 
• Deposited Residue Count: 441 
• Unique protein chains: 3

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
IGG1 TE33 FAB (LIGHT CHAIN)	A [auth L]	216	Mus musculus	Mutation(s): 0

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
IGG1 TE33 FAB (HEAVY CHAIN)	B [auth H]	210	Mus musculus	Mutation(s): 0

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
CHOLERA TOXIN PEPTIDE 3 (CTP3)	C [auth P]	15	Escherichia coli	Mutation(s): 0  Gene Names: eltB
UniProt
Find proteins for P32890 (Escherichia coli) Explore P32890  Go to UniProtKB:  P32890

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CIT	D [auth L]	CITRIC ACID C6 H8 O7 KRKNYBCHXYNGOX-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Work:  0.148 (Depositor) 
• R-Value Observed: 0.148 (Depositor) 

Space Group: P 2₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 104.15	α = 90
b = 110.61	β = 90
c = 40.68	γ = 90

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1994-01-31 
Deposition Author(s): Shoham, M.

Revision History  

• Version 1.0: 1994-01-31
  Type: Initial release
  
• Version 1.1: 2008-03-03
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2024-06-05
  Changes: Data collection, Database references, Derived calculations, Other
• Version 1.4: 2024-11-20
  Changes: Structure summary