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C9903 Sigma

Cholera Toxin B subunit

≥95% (SDS-PAGE), lyophilized powder

Synonym: CTB



Related Categories Bacteria, Bacteria-derived adjuvants, Bioactive Small Molecule Alphabetical Index, Bioactive Small Molecules, C-CH,
Quality Level   PREMIUM
assay   ≥95% (SDS-PAGE)
form   lyophilized powder
mol wt   mol wt ~12 kDa
composition   Protein, ~5% Lowry
impurities   ≤0.5% Cholera toxin A subunit (SDS-PAGE)
solubility   H2O: 10 mg/mL
storage temp.   2-8°C


Analysis Note

Activity measured by ELISA using ganglioside GM1-coated multiwell plates, rabbit anti-Cholera toxin B subunit antibodies, and peroxidase-labeled goat anti-rabbit IgG as the secondary antibody. 50% saturation of binding was achieved with 0.05-1 μg of Cholera toxin B subunit per mL.


Package size based on protein content


When reconstituted with water to a final concentration of 1 mg of CTB per ml, the solution will contain 0.05 M Tris buffer, pH 7.5, 0.2 M NaCl, 3 mM NaN3 and 1 mM sodium EDTA.

Physical form

Lyophilized powder containing Tris buffer salts, sodium chloride, sodium azide, and sodium EDTA.


Cholera Toxin B subunit has been used:
• for macrophage stimulation and i.p. injection in a study to determine the endotoxin sensitivity of Caspase-4.
• in transganglionic and retrograde tract-tracing method combined with dual-immunofluorescence histochemistry of adult rat Vmes neuron cells.

Biochem/physiol Actions

The cholera toxin B subunit is used for track tracing in neurological research, taking advantage of GM1 ganglioside binding and retrograde transport. Tissue culture cells treated with cholera toxin are not killed and tissues of animals do not become necrotic.

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.

General description

Cholera Toxin is a heterohexameric AB5 enterotoxin. Cholera Toxin B subunit is the the B subunit pentamer of cholera toxin produced by Vibrio cholera. It is generally involved in the cell trafficking and signalling machineries.

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Safety Information

NONH for all modes of transport
WGK Germany 


Certificate of Analysis

Certificate of Origin

Protocols & Articles


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