Open AccessDeficiency of Pkc1 activity affects glycerol metabolism in Saccharomyces cerevisiae
Author(s) -
Gomes Katia N.,
Freitas Suzy M.A.C.,
Pais Thiago M.,
Fietto Juliana L.R.,
Totola António H.,
Arantes Rosa M.E.,
Martins António,
Lucas Cândida,
Schuller Dorit,
Casal Margarida,
Castro Ieso M.,
Fietto Luciano G.,
Brandão Rogelio L.
Publication year - 2005
Publication title -
fems yeast research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 92
eISSN - 1567-1364
pISSN - 1567-1356
DOI - 10.1016/j.femsyr.2005.01.003
Subject(s) - derepression , biology , psychological repression , microbiology and biotechnology , regulation of gene expression , kinase , transcriptional regulation , gene , gene expression , biochemistry
Protein kinase C is apparently involved in the control of many cellular systems: the cell wall integrity pathway, the synthesis of ribosomes, the appropriated reallocation of transcription factors under specific stress conditions and also the regulation of N ‐glycosylation activity. All these observations suggest the existence of additional targets not yet identified. In the context of the control of carbon metabolism, previous data had demonstrated that Pkc1p might play a central role in the control of cellular growth and metabolism in yeast. In particular, it has been suggested that it might be involved in the derepression of genes under glucose‐repression by driving an appropriated subcellular localization of transcriptional factors, such as Mig1p. In this work, we show that a pkc 1Δ mutant is unable to grow on glycerol because it cannot perform the derepression of the GUT1 gene that encodes glycerol kinase. Additionally, active transport is also partially affected. Using this phenotype, we were able to isolate a new pkc 1Δ revertant. We also isolated two transformants identified as the nuclear exportin Msn5 and the histone deacetylase Hos2 extragenic suppressors of this mutation. Based on these results, we postulate that Pkc1p may be involved in the control of the cellular localization and/or regulation of the activity of nuclear proteins implicated in gene expression.