Originally published as Genetics Published Articles Ahead of Print on June 14, 2005.

Genetics, Vol. 171, 23-34, September 2005, Copyright © 2005
doi:10.1534/genetics.105.043489

The [URE3] Prion Is Not Conserved Among Saccharomyces Species

IBGC-CNRS/Université Victor Segalen Bordeaux2, UMR 5095, 33077 Bordeaux, France

1 Corresponding author: Dana-Farber Cancer Institute, M620, 44 Binney St., Boston, MA 02115.
E-mail: nicolas_talarek{at}dfci.harvard.edu

The [URE3] prion of Saccharomyces cerevisiae is a self-propagating inactive form of the nitrogen catabolism regulator Ure2p. To determine whether the [URE3] prion is conserved in S. cerevisiae-related yeast species, we have developed genetic tools allowing the detection of [URE3] in Saccharomyces paradoxus and Saccharomyces uvarum. We found that [URE3] is conserved in S. uvarum. In contrast, [URE3] was not detected in S. paradoxus. The inability of S. paradoxus Ure2p to switch to a prion isoform results from the primary sequence of the protein and not from the lack of cellular cofactors as heterologous Ure2p can propagate [URE3] in this species. Our data therefore demonstrate that [URE3] is conserved only in a subset of Saccharomyces species. Implications of our finding on the physiological and evolutionary meaning of the yeast [URE3] prion are discussed.




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