Open AccessA novel Rtg2p activity regulates nitrogen catabolism in yeast
Author(s) -
Michael Pierce,
MarieLise Maddelein,
Bruce R. Roberts,
Reed B. Wickner
Publication year - 2001
Publication title -
proceedings of the national academy of sciences of the united states of america
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.011
H-Index - 771
eISSN - 1091-6490
pISSN - 0027-8424
DOI - 10.1073/pnas.181486098
Subject(s) - saccharomyces cerevisiae , phenotype , catabolism , transcription (linguistics) , biology , transcription factor , yeast , gene , mutant , repressor , genetics , microbiology and biotechnology , biochemistry , metabolism , linguistics , philosophy
The inactivity of Ure2p, caused by either a ure2 mutation or the presence of the [URE3] prion, increases DAL5 transcription and thus enables Saccharomyces cerevisiae to take up ureidosuccinate (USA+). Rtg2p regulates transcription of glutamate-repressible genes by facilitation of the nuclear entry of the Rtg1 and Rtg3 proteins. We find that rtg2 Delta cells take up USA even without the presence of [URE3]. Thus, the USA+ phenotype of rtg2 Delta strains is not the result generation of the [URE3] prion but is a regulatory effect. Because rtg1 Delta or rtg3 Delta mutations or the presence of glutamate do not produce the USA+ phenotype, this is a novel function of Rtg2p. The USA+ phenotype of rtg2 Delta strains depends on GLN3, is caused by overexpression of DAL5, and is blocked by mks1 Delta, but not by overexpression of Ure2p. These characteristics suggest that Rtg2p acts in the upstream part of the nitrogen catabolism regulation pathway.