期刊
BIOCHEMICAL JOURNAL
卷 363, 期 -, 页码 515-520出版社
PORTLAND PRESS
DOI: 10.1042/0264-6021:3630515
关键词
Gal4p; galactose; gene expression; protein-protein interaction; yeast
The genes encoding the enzymes required for galactose metabolism in Saccharomyces cerevisiae are controlled at the level of transcription by a genetic switch consisting of three proteins: a transcriptional activator. Gal4p a transcriptional repressor. Gal80p and a ligand sensor, Gal3p. The switch is turned on in the presence of two small molecule ligands, galactose and ATP. Gal3p shows a high degree of sequence identity with Gal1p. the yeast galactokinase. We have mapped the interaction between Gal80p and Gal3p, which only occurs in the presence of both ligands, using protease protection experiments and have shown that this involves amino acid residue 331 of Gal80p. Gel-filtration experiments indicate that Gal3p, or the galactokinase Gal1p, interact directly with Gal80p to form a complex with 1:1 stoichiometry.
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