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Regulated degradation of the transcription factor Gcn4.
Author(s) -
Kornitzer D.,
Raboy B.,
Kulka R.G.,
Fink G.R.
Publication year - 1994
Publication title -
the embo journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.484
H-Index - 392
eISSN - 1460-2075
pISSN - 0261-4189
DOI - 10.1002/j.1460-2075.1994.tb06948.x
Subject(s) - center (category theory) , biology , library science , computer science , chemistry , crystallography
We report that Gcn4, a yeast transcriptional activator of the bZIP family involved in the regulation of the biosynthesis of amino acids and purines, is rapidly turned over. This degradation is inhibited under conditions of starvation for amino acids. Degradation is also inhibited by single amino acid alterations in a region adjacent to the Gcn4 activation domain. Furthermore, we show that degradation of Gcn4 proceeds through the ubiquitin pathway, a major proteolytic system for cytoplasmic proteins, and is dependent on two specific ubiquitin conjugating enzymes, Cdc34 (Ubc3) and Rad6 (Ubc2). As a first step towards reconstituting the Gcn4 degradation pathway in vitro, we show that purified Cdc34 and Rad6 proteins are able to direct the specific ubiquitination of Gcn4.