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- W1553457312 abstract "The yeast and fungal prions determine heritable and infectious traits, and are thus genes composed of protein. Most prions are inactive forms of a normal protein as it forms a self-propagating filamentous β-sheet-rich polymer structure called amyloid. Remarkably, a single prion protein sequence can form two or more faithfully inherited prion variants, in effect alleles of these genes. What protein structure explains this protein-based inheritance? Using solid-state nuclear magnetic resonance, we showed that the infectious amyloids of the prion domains of Ure2p, Sup35p and Rnq1p have an in-register parallel architecture. This structure explains how the amyloid filament ends can template the structure of a new protein as it joins the filament. The yeast prions [PSI+] and [URE3] are not found in wild strains, indicating that they are a disadvantage to the cell. Moreover, the prion domains of Ure2p and Sup35p have functions unrelated to prion formation, indicating that these domains are not present for the purpose of forming prions. Indeed, prion-forming ability is not conserved, even within Saccharomyces cerevisiae, suggesting that the rare formation of prions is a disease. The prion domain sequences generally vary more rapidly in evolution than does the remainder of the molecule, producing a barrier to prion transmission, perhaps selected in evolution by this protection." @default.
- W1553457312 created "2016-06-24" @default.
- W1553457312 creator A5005390814 @default.
- W1553457312 creator A5006393292 @default.
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- W1553457312 creator A5051756354 @default.
- W1553457312 creator A5063043082 @default.
- W1553457312 creator A5068072238 @default.
- W1553457312 creator A5075831695 @default.
- W1553457312 creator A5076414916 @default.
- W1553457312 date "2010-11-05" @default.
- W1553457312 modified "2023-09-27" @default.
- W1553457312 title "Prion amyloid structure explains templating: how proteins can be genes" @default.
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