Domain organization and structure-function relationship of the HET-s prion protein of Podospora anserina |
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Authors: | Balguerie Axelle Dos Reis Suzana Ritter Christiane Chaignepain Stéphane Coulary-Salin Bénédicte Forge Vincent Bathany Katell Lascu Ioan Schmitter Jean-Marie Riek Roland Saupe Sven J |
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Affiliation: | Laboratoire de Génétique Moléculaire des Champignons, Service de Microscopie, UMR 5095 CNRS/Université de Bordeaux 2, 1 rue Camille St Sa?ns, 33077 Bordeaux cedex, France. |
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Abstract: | The [Het-s] infectious element of the fungus Podospora anserina is a prion protein involved in a genetically controlled cell death reaction termed heterokaryon incompatibility. Previous analyses indicate that [Het-s] propagates as a self-perpetuating amyloid aggregate. The HET-s protein is 289 amino acids in length. Herein, we identify the region of the HET-s protein that is responsible for amyloid formation and prion propagation. The region of HET-s spanning residues 218-289 forms amyloid fibers in vitro and allows prion propagation in vivo. Conversely, a C-terminal deletion in HET-s prevents amyloid aggregation in vitro and prion propagation in vivo, and abolishes the incompatibility function. In the soluble form of HET-s, the region from residue 1 to 227 forms a well-folded domain while the C-terminal region is highly flexible. Together, our data establish a domain structure-function relationship for HET-s amyloid formation, prion propagation and incompatibility activity. |
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