How does pertussis toxin affect G proteins?
Pertussis toxin is isolated from the bacteria Bordetella pertussis. It is shown to modify the function of G proteins by catalyzing the ADP-ribosylation of a cysteine residue on the carboxy terminal of α subunit of Gi and Go. Gia is more sensitive to the actions of pertussis toxin than Goa.
What does PTX block?
PTX catalyzes the ADP-ribosylation of the α subunits of the heterotrimeric Gi/o protein family (Gαi, Gαo, and Gαt; except Gαz), thereby preventing the G proteins from interacting with their cognate G protein-coupled receptors (GPCRs) [4].
What toxin does Bordetella pertussis produce?
Bordetella pertussis, a gram-negative bacterial pathogen of the human respiratory tract, secretes at least two protein toxins, pertussis toxin (PT) and adenylate cyclase toxin (ACT), that are important virulence factors in mouse models of infection. PT is an AB5 toxin that is uniquely produced by B. pertussis.
What does pertussis toxin do in EAE?
Pertussis toxin (PT) has been widely used to facilitate the induction of experimental autoimmune encephalomyelitis (EAE) in rodents. It has been suggested that this microbial product promotes EAE by opening up the blood-brain barrier and thereby facilitates the migration of pathogenic T cells to the CNS.
How is pertussis toxin secreted?
Pertussis toxin, produced and secreted by the whooping cough agent Bordetella pertussis, is one of the most complex soluble bacterial proteins. It is actively secreted through the B. pertussis cell envelope by the Ptl secretion system, a member of the widespread type IV secretion systems.
How do you reconstitute pertussis toxin?
Reconstitution Recommendation: Reconstitute the contents of this vial with 500 μL sterile, distilled water. The composition of the solution will be 50 μg Pertussis toxin, 10 mM sodium phosphate, pH 7.0, 50 mM sodium chloride.
How does Bordetella pertussis cause disease?
Whooping cough is caused by a type of bacteria called Bordetella pertussis. When an infected person coughs or sneezes, tiny germ-laden droplets are sprayed into the air and breathed into the lungs of anyone who happens to be nearby.
