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C8052 Sigma

Cholera Toxin from Vibrio cholerae

~95% (SDS-PAGE), lyophilized powder, 1 × 105-1 × 106 units/mg protein

Synonym: CTX, Cholera enterotoxin, Cholergen

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Properties

Related Categories Bacteria, Bioactive Small Molecule Alphabetical Index, Bioactive Small Molecules, C-CH, Cell Biology,
Quality Level   PREMIUM
assay   ~95% (SDS-PAGE)
form   lyophilized powder
composition   Protein, ~5% Lowry-TCA
solubility   H2O: soluble10 mg/mL
storage temp.   2-8°C

Description

Frequently Asked Questions

Frequently Asked Questions are available for this Product.

Packaging

Package size based on protein content.

Reconstitution

When reconstituted at 1 mg/mL in water, solution will contain 0.05 M Tris buffer salts, pH 7.5, 0.2 M NaCl, 0.003 M NaN3, and 0.001 M sodium EDTA. Store reconstituted solutions in the refrigerator.

Unit Definition

One unit increases adenylate cyclase activity 6-fold, measured as [3H]-cAMP present, using approx. 70,000 CHO cells after incubation for 90 min at 37 °C with [3H]-adenine followed by a 15 min incubation with 1 mM 3-isobutyl-1-methylxanthine (IBMX).

Physical form

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

Biochem/physiol Actions

Toxin consisting of an A subunit (27 kDa) surrounded by five B subunits (approximately 12 kDa each), which attach the toxin to ganglioside GM1 on the cell surface. The A subunit catalyzes ADP-ribosylation of the α-subunit of the stimulatory G protein (Gαs), reducing GTPase activity and activating the α-subunit. This activation of Gαs leads to an increase in the activity of adenylyl cyclase, resulting in increased levels of cAMP. Also ADP-ribosylates transducin in the eye rod outer segments, inactivating its GTPase activity. Cholera toxin has also been reported to ADP-ribosylate tubulin. Shown to be a potent mucosal vaccine adjuvant, inducing T helper cell type 2 responses by inhibiting the production of interleukin-12.

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.

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Safety & Documentation

Safety Information

Symbol 
GHS06  GHS06
Signal word 
Danger
Hazard statements 
RIDADR 
UN 3462 6.1 / PGII
WGK Germany 
2

Documents

Certificate of Analysis

Certificate of Origin

Protocols & Articles

Articles

Discover Bioactive Small Molecules for Cyclic Nucleotides

Transmission of an extracellular signal across the cell membrane is initiated by activation of many types of hormone and neurotransmitter receptors, such as G-protein coupled receptors (GPCRs), and c...
Keywords: Antivirals, Cancer, Cardiovascular, Cellular processes, Diabetes, Diseases, Hormones, Neurotransmitters

Peer-Reviewed Papers
15

References

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