シクロ[L-Asn-L-t4Hyp-[(3R,4R)-4,5-ジヒドロキシ-3-メチル-L-Nva-]-6-ヒドロキシ-L-Trp2(1)-Gly-3-メチル-L-Nva-Gly-3-オキソメルカプト(1)-L-Ala-]

Treatment is mainly supportive (gastric lavage, activated carbon, fluid resuscitation) but includes various drugs to counter the amatoxins, including intravenous penicillin and cephalosporin derivatives, and, in cases of greater ingestion, can extend to an orthotopic liver transplant. The most reliable method to treat amanitin poisoning is through having the stomach pumped immediately after ingestion; however, the onset of symptoms is generally too late for this to be an option. (A300)

Around 15% of those poisoned will die within 10 days, progressing through a comatose stage to renal failure, liver failure, hepatic coma, respiratory failure and death. Those who recover are at risk of permanent liver damage. Diagnosis is difficult, and is established by observation of the clinical symptoms as well as the presence of α-amanitin in the urine. Urine screening is generally most useful within 48 hours of ingestion. (A300)

Amanitin has an unusually strong and specific attraction to the enzyme RNA polymerase II. Upon ingestion, it binds to the RNA polymerase II enzyme, preventing mRNA synthesis and effectively causing cytolysis of hepatocytes (liver cells). (L993)

Few effects are reported within 10 hours; it is not unusual for significant effects to take as long as 24 hours after ingestion to appear, with this delay in symptoms making α-amanitin poisoning even more difficult to diagnose and all the more dangerous. By then, it is far past the time in which stomach pumping would yield an efficient result. Diarrhea and cramps are the first symptoms, but those pass, giving a false sign of remission. Typically, on the 4th to 5th day, the toxin starts to have severe effects on the liver and kidneys, leading to total system failure in both. Death usually takes place around a week from ingestion. (L993)

Free toxin may be removed by opsonization via the reticuloendothelial system (primarily the liver and kidneys) or it may be degraded through cellular internalization via the lysosomes. Lysosomes are membrane-enclosed organelles that contain an array of digestive enzymes, including several proteases.

It is found in several members of the Amanita genus of mushrooms, one being the Death cap (Amanita phalloides) as well as the Destroying angel, a complex of similar species, principally A. virosa and A. bisporigera. It is also found in the mushrooms Galerina marginata and Conocybe filaris. (L993)