Prions are infectious, self-propagating protein conformations. [PSI +], [RNQ+] and [URE3] are well characterized prions in Saccharomyces cerevisiae and represent the aggregated states of the translation termination factor Sup35, a functionally unknown protein Rnq1 and a regulator of nitrogen metabolism Ure2, respectively. Overproduction of Sup35 induces the de novo appearance of the [PSI+] prion in [RNQ+] or [URE3] strain, but not in non-prion strain. However, [RNQ+] and [URE3] prions themselves, as well as overexpression of a mutant Rnq1 protein, Rnq1Δ100 and Lsm4, hamper the maintenance of [PSI+]. These findings point to a bipolar activity of [RNQ+], [URE3], Rnq1Δ100 and Lsm4, and probably other yeast prion proteins as well, for the fate of [PSI+] prion. Possible mechanisms underlying the apparent bipolar activity of yeast prions will be discussed.
- Yeast prion
ASJC Scopus subject areas
- Cellular and Molecular Neuroscience
- Cell Biology
- Infectious Diseases