E8656
Heat-Labile Enterotoxin, B subunit (LTB) from E. coli
recombinant, expressed in Pichia pastoris, >90% (SDS-PAGE), lyophilized powder
Synonym(s):
LTB
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About This Item
UNSPSC Code:
12352200
NACRES:
NA.77
recombinant
expressed in Pichia pastoris
Quality Level
Assay
>90% (SDS-PAGE)
form
lyophilized powder
shipped in
wet ice
storage temp.
2-8°C
Application
Heat-Labile Enterotoxin, B subunit (LTB) from E. coli has been used in enzyme-linked immunosorbent assay (ELISA).
Biochem/physiol Actions
Enterotoxigenic Escherichia coli causes diarrhea through its heat-labile enterotoxin (LT). The LT is a periplasmic protein composed of one A subunit (LTA, 27 kDa) and five non-covalently associated B subunits (LTB, 11.6 kDa each) forming a ring-like pentamer. LTB has high affinity towards the toxin receptor ganglioside GM1, a glycosphingolipid found ubiquitously on the surface of mammalian cells. Ganglioside GM1 facilitates the delivery of the A subunit to the cytosol of the target cell resulting in persistent synthesis of cAMP and subsequently diarrhea. This characteristic makes LTB a good label for microglial cells (due to the enrichment of ganglioside GM1 on their cell surface). In addition, studies made mostly with animal models demonstrated that recombinant LTB could stimulate strong serum and mucosal immune responses against LT. Other studies have indicated that LTB could be used as a potent mucosal adjuvant.
Features and Benefits
This compound is a featured product for Cyclic Nucleotide research. Click here to discover more featured Cyclic Nucleotide products. Learn more about bioactive small molecules for other areas of research at sigma.com/discover-bsm.
Physical form
Lyophilized from a solution containing Heat-Labile Enterotoxin, B subunit in 0.05 M Tris buffer, pH 7.5, 0.2 M NaCl, 3 mM NaN3, and 1 mM sodium EDTA.
Analysis Note
The activity is measured by ELISA using ganglioside GM1-coated plates (Cat. No. G7641). LTB at various concentrations is incubated on the ganglioside GM1 coated wells, followed by anti-cholera toxin antibody (Cat. No. C3062), and peroxidase-labeled goat anti-rabbit IgG (Cat.No. A0545) as the secondary antibody. Binding saturation of 50% may be achieved with = 0.12 μg/mL of LTB.
Signal Word
Warning
Hazard Statements
Precautionary Statements
Hazard Classifications
Acute Tox. 4 Dermal - Aquatic Chronic 3
WGK
WGK 1
Flash Point(F)
Not applicable
Flash Point(C)
Not applicable
Personal Protective Equipment
dust mask type N95 (US), Eyeshields, Gloves
Regulatory Information
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Certificates of Analysis (COA)
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