Urmylation controls Nil1p and Gln3p-dependent expression of nitrogen-catabolite repressed genes in Saccharomyces cerevisiae.
Urm1 is a modifier protein that is conjugated to substrate proteins through thioester formation with the E1-like enzyme, Uba4. Here is shown that the lack of urmylation causes derepression of the GAP1 gene (encoding a nitrogen-regulated broad-spectrum amino acid-scavenging permease) in the presence of rich nitrogen sources, and simultaneous inhibition of the expression of CIT2, a TCA-cycle gene involved in the production of glutamate and glutamine. This effect is dependent on the TORC1- and nutrient-regulated transcriptional factors, Nil1p and Gln3p. Evidence is provided that, in the absence of urmylation, nuclear/cytosolic shuffling of both transcriptional factors is altered, ultimately leading to inability to repress GAP1 gene in the presence of a rich nitrogen source. Altogether, the data presented here indicate an important role of the urmylation pathway in regulating the expression of genes involved in sensing and controlling amino acids levels.
Rubio-Texeira
Marta
M
Whitehead Institute, Massachusetts Institute of Technology, 9 Cambridge Center 653, Cambridge, MA 02142, USA. rubio@wi.mit.edu
D021581:Active Transport, Cell Nucleus; D026905:Amino Acid Transport Systems / Q000235:genetics; D002952:Citric Acid Cycle / Q000235:genetics; D050980:GATA Transcription Factors / Q000378:metabolism*; D017353:Gene Deletion; D015966:Gene Expression Regulation, Fungal; D005800:Genes, Fungal; D009584:Nitrogen / Q000378:metabolism*; D012097:Repressor Proteins / Q000378:metabolism*; D012441:Saccharomyces cerevisiae / Q000235:genetics* / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism*; D014157:Transcription Factors / Q000378:metabolism*
D026905:Amino Acid Transport Systems; C491145:GAP1 protein, S cerevisiae; C096100:GAT1 protein, S cerevisiae; D050980:GATA Transcription Factors; C071664:GLN3 protein, S cerevisiae; D012097:Repressor Proteins; D029701:Saccharomyces cerevisiae Proteins; D014157:Transcription Factors; C406282:URM1 protein, S cerevisiae; D009584:Nitrogen