title: Prions affect the appearance of other prions: the story of [PIN(+)].
abstract: Prions are self-propagating protein conformations. Recent research brought insight into prion propagation, but how they first appear is unknown. We previously established that the yeast non-Mendelian trait [PIN(+)] is required for the de novo appearance of the [PSI(+)] prion. Here, we show that the presence of prions formed by Rnq1 or Ure2 is sufficient to make cells [PIN(+)]. Thus, [PIN(+)] can be caused by more than one prion. Furthermore, an unbiased functional screen for [PIN(+)] prions uncovered the known prion gene, URE2, the proposed prion gene, NEW1, and nine novel candidate prion genes all carrying prion domains. Importantly, the de novo appearance of Rnq1::GFP prion aggregates also requires the presence of other prions, suggesting the existence of a general mechanism by which the appearance of prions is enhanced by heterologous prion aggregates.
authors.affiliation: Laboratory for Molecular Biology, Department of Biological Sciences, University of Illinois at Chicago, 900 South Ashland Avenue, Chicago, IL 60607, USA.
authors.forename: I L
authors.initials: IL
authors.lastname: Derkatch
authors.forename: M E
authors.initials: ME
authors.lastname: Bradley
authors.forename: J Y
authors.initials: JY
authors.lastname: Hong
authors.forename: S W
authors.initials: SW
authors.lastname: Liebman
mesh_terms: D005656:Fungal Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D005800:Genes, Fungal / Q000235:genetics; D005979:Glutathione Peroxidase; D008954:Models, Biological; D010641:Phenotype; D010957:Plasmids / Q000235:genetics; D011328:Prions / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism*; D011485:Protein Binding; D020836:Protein Structure, Quaternary; D017434:Protein Structure, Tertiary; D011993:Recombinant Fusion Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins
chemical_list: D005656:Fungal Proteins; D011328:Prions; C404807:RNQ1 protein, S cerevisiae; D011993:Recombinant Fusion Proteins; D029701:Saccharomyces cerevisiae Proteins; D005979:Glutathione Peroxidase; C067020:URE2 protein, S cerevisiae