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Dissecting regulatory networks by means of two‐dimensional gel electrophoresis: Application to the study of the diauxic shift in the yeast Saccharomyces cerevisiae
Author(s) -
Haurie Valérie,
Sagliocco Francis,
Boucherie Hélian
Publication year - 2004
Publication title -
proteomics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.26
H-Index - 167
eISSN - 1615-9861
pISSN - 1615-9853
DOI - 10.1002/pmic.200300564
Subject(s) - saccharomyces cerevisiae , mutant , activator (genetics) , electrophoretic mobility shift assay , biology , biochemistry , gene , proteomics , yeast , glycolysis , gel electrophoresis , gene expression , enzyme , microbiology and biotechnology
Using a proteomic approach based on the two‐dimensional (2‐D) gel analysis of synthesized proteins, we investigated the involvement of the Snf1 kinase pathway in the regulation of gene expression during the diauxic shift in Saccharomyces cerevisiae . For this purpose, we used a mutant strain deleted for SNF4 , the gene coding for the activator subunit of Snf1p. The levels of synthesis of 82 spots were found to be affected by the absence of Snf4p at the diauxic shift. Half of the proteins which exhibit a reduced synthesis in the mutant strain are proteins whose genes are controlled by the transcriptional activator Cat8p, a target of Snf1p. Proteins with an increased level of synthesis in the mutant strain were also observed. Among them are glycolytic enzymes whose synthesis is strongly reduced when wild‐type cells enter the diauxic shift. This observation suggests that Snf1p exerts a negative control on the expression of glycolytic genes during the diauxic transition. The results obtained in this study were compiled with those previously obtained by similar proteomic approach with other regulatory factors involved in the diauxic shift. This compilation illustrates how 2‐D gel electrophoresis can be used to elucidate the network of regulators participating to complex biological process.