A general model of prion strains and their pathogenicity.
Prions are lethal mammalian pathogens composed of aggregated conformational isomers of a host-encoded glycoprotein and which appear to lack nucleic acids. Their unique biology, allied with the public-health risks posed by prion zoonoses such as bovine spongiform encephalopathy, has focused much attention on the molecular basis of prion propagation and the "species barrier" that controls cross-species transmission. Both are intimately linked to understanding how multiple prion "strains" are encoded by a protein-only agent. The underlying mechanisms are clearly of much wider importance, and analogous protein-based inheritance mechanisms are recognized in yeast and fungi. Recent advances suggest that prions themselves are not directly neurotoxic, but rather their propagation involves production of toxic species, which may be uncoupled from infectivity.
Collinge
John
J
MRC Prion Unit, Department of Neurodegenerative Disease, UCL Institute of Neurology, London WC1N 3BG, UK. j.collinge@prion.ucl.ac.uk
Clarke
Anthony R
AR
D000818:Animals; D001923:Brain Chemistry; D006801:Humans; D008954:Models, Biological; D018621:PrPC Proteins / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism; D018620:PrPSc Proteins / Q000737:chemistry* / Q000302:isolation & purification / Q000378:metabolism / Q000472:pathogenicity*; D017096:Prion Diseases / Q000378:metabolism* / Q000635:transmission*; D011328:Prions / Q000737:chemistry* / Q000302:isolation & purification / Q000472:pathogenicity*; D011487:Protein Conformation; D017510:Protein Folding; D011994:Recombinant Proteins / Q000737:chemistry; D013045:Species Specificity
D018621:PrPC Proteins; D018620:PrPSc Proteins; D011328:Prions; D011994:Recombinant Proteins