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BIMM118<br />

G-Protein-coupled Receptors<br />

Cholera-toxin: causes ADP-ribosylation of G sα => release of GTP inhibited => G sα trapped in active form. cAMP<br />

regulates secretion of fluid into the intestinum => enormous loss of liquid and electrolytes => death!<br />

Pertussis-toxin: causes ADP-ribosylation of G iα , release of GDP inhibited => G iα locked in its INactive form => can not<br />

inhibit AC!

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