From the Cover: Gene family encoding the major toxins of lethal Amanita mushrooms Export

@article{citeulike:2265306, abstract = {Amatoxins, the lethal constituents of poisonous mushrooms in the genus Amanita, are bicyclic octapeptides. Two genes in A. bisporigera, AMA1 and PHA1, directly encode {alpha}-amanitin, an amatoxin, and the related bicyclic heptapeptide phallacidin, a phallotoxin, indicating that these compounds are synthesized on ribosomes and not by nonribosomal peptide synthetases. {alpha}-Amanitin and phallacidin are synthesized as proproteins of 35 and 34 amino acids, respectively, from which they are predicted to be cleaved by a prolyl oligopeptidase. AMA1 and PHA1 are present in other toxic species of Amanita section Phalloidae but are absent from nontoxic species in other sections. The genomes of A. bisporigera and A. phalloides contain multiple sequences related to AMA1 and PHA1. The predicted protein products of this family of genes are characterized by a hypervariable "toxin" region capable of encoding a wide variety of peptides of 710 amino acids flanked by conserved sequences. Our results suggest that these fungi have a broad capacity to synthesize cyclic peptides on ribosomes. 10.1073/pnas.0707340104}, author = {Hallen, Heather E. and Luo, Hong and Scott-Craig, John S. and Walton, Jonathan D.}, citeulike-article-id = {2265306}, citeulike-linkout-0 = {http://dx.doi.org/10.1073/pnas.0707340104}, citeulike-linkout-1 = {http://www.pnas.org/cgi/content/abstract/104/48/19097}, citeulike-linkout-2 = {http://view.ncbi.nlm.nih.gov/pubmed/18025465}, citeulike-linkout-3 = {http://www.hubmed.org/display.cgi?uids=18025465}, day = {27}, doi = {10.1073/pnas.0707340104}, journal = {Proceedings of the National Academy of Sciences}, keywords = {amanita, baisidiomycota, toxin}, month = {November}, number = {48}, pages = {19097--19101}, posted-at = {2008-01-21 02:07:09}, priority = {2}, title = {From the Cover: Gene family encoding the major toxins of lethal Amanita mushrooms}, url = {http://dx.doi.org/10.1073/pnas.0707340104}, volume = {104}, year = {2007} }

TY - JOUR ID - citeulike:2265306 L3 - citeulike-article-id:2265306 N2 - Amatoxins, the lethal constituents of poisonous mushrooms in the genus Amanita, are bicyclic octapeptides. Two genes in A. bisporigera, AMA1 and PHA1, directly encode {alpha}-amanitin, an amatoxin, and the related bicyclic heptapeptide phallacidin, a phallotoxin, indicating that these compounds are synthesized on ribosomes and not by nonribosomal peptide synthetases. {alpha}-Amanitin and phallacidin are synthesized as proproteins of 35 and 34 amino acids, respectively, from which they are predicted to be cleaved by a prolyl oligopeptidase. AMA1 and PHA1 are present in other toxic species of Amanita section Phalloidae but are absent from nontoxic species in other sections. The genomes of A. bisporigera and A. phalloides contain multiple sequences related to AMA1 and PHA1. The predicted protein products of this family of genes are characterized by a hypervariable "toxin" region capable of encoding a wide variety of peptides of 710 amino acids flanked by conserved sequences. Our results suggest that these fungi have a broad capacity to synthesize cyclic peptides on ribosomes. 10.1073/pnas.0707340104 IS - 48 JF - Proceedings of the National Academy of Sciences EP - 19101 TI - From the Cover: Gene family encoding the major toxins of lethal Amanita mushrooms VL - 104 SP - 19097 KW - amanita KW - baisidiomycota KW - toxin AU - Hallen, Heather AU - Luo, Hong AU - Scott-Craig, John AU - Walton, Jonathan PY - 2007/11/27/ UR - http://dx.doi.org/10.1073/pnas.0707340104 ER -