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JOURNAL ARTICLE
REVIEW
Yeast Prions Compared to Functional Prions and Amyloids.
Journal of Molecular Biology 2018 October 13
Saccharomyces cerevisiae is an occasional host to an array of prions, most based on self-propagating, self-templating amyloid filaments of a normally soluble protein. [URE3] is a prion of Ure2p, a regulator of nitrogen catabolism, while [PSI+] is a prion of Sup35p, a subunit of the translation termination factor Sup35p. In contrast to the functional prions, [Het-s] of Podospora anserina and [BETA] of yeast, the amyloid-based yeast prions are rare in wild strains, arise sporadically, have an array of prion variants for a single prion protein sequence, have a folded in-register parallel β-sheet amyloid architecture, are detrimental to their hosts, arouse a stress response in the host, and are subject to curing by various host anti-prion systems. These characteristics allow a logical basis for distinction between functional amyloids/prions and prion diseases. These infectious yeast amyloidoses are outstanding models for the many common human amyloid-based diseases that are increasingly found to have some infectious characteristics.
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