What does cholera toxin do?

Cholera toxin (also known as choleragen and sometimes abbreviated to CTX, Ctx or CT) is AB5 multimeric protein complex secreted by the bacterium Vibrio cholerae. CTX is responsible for the massive, watery diarrhea characteristic of cholera infection. It is a member of the Heat-labile enterotoxin family.

What type of toxin is cholera?

bacterial protein toxin
Cholera toxin (CT) is a bacterial protein toxin produced by Vibrio cholerae, which binds to cellular membranes with high affinity.

What is the mechanism of action of the cholera toxin?

Cholera diarrhoea is due to the action of a toxin that acts on all animal cells by stimulating the enzyme adenylate cyclase, which catalyses the production oc cyclic AMP from ATP.

Is cholera a virus?

Cholera is an acute, diarrheal illness caused by infection of the intestine with the toxigenic bacterium Vibrio cholerae serogroup O1 or O139. An estimated 2.9 million cases and 95,000 deaths occur each year around the world. The infection is often mild or without symptoms, but can be severe.

What is the incubation period for cholera?

Providers should be particularly suspicious of cholera in patients returning from cholera-endemic areas or with a recent history of raw seafood consumption from a cholera-endemic area, even if they have only mild diarrheal illness. The incubation period of cholera is between 2 hours and 5 days.

Is cholera toxin pore forming?

Besides CT and TCP, V. cholerae generates several additional secreted proteins that possess well characterized cytotoxic activity in vitro (16, 17). This cytotoxic factor is a pore-forming toxin that causes vacuolization or cell lysis and necrosis, depending on the cell type and toxin concentration (21–25).

How is cholera spread from one person to another?

How is cholera spread? The cholera bacteria is passed through feces (poop). It is spread by eating or drinking food or water contaminated by the feces (poop) of an infected person. This occurs more often in underdeveloped countries lacking proper water supplies and sewage disposal.

How did cholera spread?

How big is the genome of CTXφ virus?

The genome of CTXφ is 6.9 kb long and consists of two regions. The core region contains genes that code for CTX itself and some proteins that are presumed to form the outside coat of the virus. The RS2 region contains genes that control the replication, regulation, and integration of CTXφ.

How does TCP bind to the CTXφ coat protein?

The TCP is thought to bind to the minor CTXφ coat protein OrfU. The second is the TolQRA membrane protein structure. These requirements for phage membrane binding are quite similar to those of the Ff phages, which infects the bacterium Escherichia coli and requires the F pilus along with the TolQRA structure.

How does CTXφ get into the host cell?

Insertion, replication and release from host cell. The insertion of the CTXφ genetic material into the V. cholerae bacterium is mediated by two receptors. The first of these is the Toxin-Coregulated Pilus (TCP), which also aids the bacterium in adhering to the intestinal cell wall. The TCP is thought to bind to the minor CTXφ coat protein OrfU.

What kind of virus is Vibrio cholerae CTXφ?

The CTXφ bacteriophage is a filamentous bacteriophage. It is a positive -strand DNA virus with single-stranded DNA (ssDNA). CTXφ infects some strains of Vibrio cholerae, the bacterium that causes cholera. It carries the genes for cholera toxin (CTX), which makes cholera especially virulent. It can carry genes from one V. cholerae strain to another.