1LTI

HEAT-LABILE ENTEROTOXIN (LT-I) COMPLEX WITH T-ANTIGEN

• PDB DOI: https://doi.org/10.2210/pdb1LTI/pdb

• Classification: ENTEROTOXIN
• Organism(s): Escherichia coli
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 1996-05-09 Released: 1996-08-17 
• Deposition Author(s): Van Den Akker, F., Hol, W.G.J.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.13 Å
• R-Value Free: 0.274 
• R-Value Work: 0.185 
• R-Value Observed: 0.185 

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 7-mer - A5B1C1 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.

Macromolecule Content

• Total Structure Weight: 87.83 kDa 
• Atom Count: 6,220 
• Modelled Residue Count: 741 
• Deposited Residue Count: 755 
• Unique protein chains: 3

Macromolecules

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

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
HEAT LABILE ENTEROTOXIN TYPE I	F [auth A]	192	Escherichia coli	Mutation(s): 0
UniProt
Find proteins for P06717 (Escherichia coli) Explore P06717  Go to UniProtKB:  P06717

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
HEAT LABILE ENTEROTOXIN TYPE I	G [auth C]	48	Escherichia coli	Mutation(s): 0
UniProt
Find proteins for P06717 (Escherichia coli) Explore P06717  Go to UniProtKB:  P06717

Oligosaccharides

Help

Entity ID: 4
Molecule	Chains	Length	2D Diagram	Glycosylation	3D Interactions
beta-D-galactopyranose-(1-3)-2-acetamido-2-deoxy-alpha-D-galactopyranose	H [auth B]	2		N/A
Glycosylation Resources
GlyTouCan:  G00031MO GlyCosmos:  G00031MO GlyGen:  G00031MO

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
GAL	I [auth D], J [auth E], K [auth H]	beta-D-galactopyranose C6 H12 O6 WQZGKKKJIJFFOK-FPRJBGLDSA-N

Biologically Interesting Molecules (External Reference) 1 Unique

Entity ID: 4
ID	Chains	Name	Type/Class	2D Diagram	3D Interactions
PRD_900084	H [auth B]	Thomsen-Friedenreich antigen	Oligosaccharide / Antigen

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.13 Å
• R-Value Free: 0.274 
• R-Value Work: 0.185 
• R-Value Observed: 0.185 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 119.7	α = 90
b = 100.5	β = 90
c = 64.4	γ = 90

Software Package:

Software Name	Purpose
RAXIS	data collection
RAXIS	data reduction
X-PLOR	model building
X-PLOR	refinement
R-AXIS	data reduction
R-AXIS	data scaling
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1996-08-17 
Deposition Author(s): Van Den Akker, F., Hol, W.G.J.

Revision History  

• Version 1.0: 1996-08-17
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 2.0: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Advisory, Atomic model, Data collection, Derived calculations, Other, Structure summary