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Maf1, repressor of tRNA transcription, is involved in the control of gluconeogenetic genes in Saccharomyces cerevisiae.
- Source :
-
Gene [Gene] 2013 Aug 15; Vol. 526 (1), pp. 16-22. Date of Electronic Publication: 2013 May 05. - Publication Year :
- 2013
-
Abstract
- Maf1 is a negative regulator of RNA polymerase III (Pol III) in yeast. Maf1-depleted cells manifest elevated tRNA transcription and inability to grow on non-fermentable carbon source, such as glycerol. Using genomic microarray approach, we examined the effect of Maf1 deletion on expression of Pol II-transcribed genes in yeast grown in medium containing glycerol. We found that transcription of FBP1 and PCK1, two major genes controlling gluconeogenesis, was decreased in maf1Δ cells. FBP1 is located on chromosome XII in close proximity to a tRNA-Lys gene. Accordingly we hypothesized that decreased FBP1 mRNA level could be due to the effect of Maf1 on tgm silencing (tRNA gene mediated silencing). Two approaches were used to verify this hypothesis. First, we inactivated tRNA-Lys gene on chromosome XII by inserting a deletion cassette in a control wild type strain and in maf1Δ mutant. Second, we introduced a point mutation in the promoter of the tRNA-Lys gene cloned with the adjacent FBP1 in a plasmid and expressed in fbp1Δ or fbp1Δ maf1Δ cells. The levels of FBP1 mRNA were determined by RT-qPCR in each strain. Although the inactivation of the chromosomal tRNA-Lys gene increased expression of the neighboring FBP1, the mutation preventing transcription of the plasmid-born tRNA-Lys gene had no significant effect on FBP1 transcription. Taken together, those results do not support the concept of tgm silencing of FBP1. Other possible mechanisms are discussed.<br /> (Copyright © 2013 Elsevier B.V. All rights reserved.)
- Subjects :
- Fructose-Bisphosphatase genetics
Gene Deletion
Gene Expression Regulation, Fungal
Mutation
Phosphoenolpyruvate Carboxykinase (ATP) genetics
Phosphoenolpyruvate Carboxykinase (ATP) metabolism
RNA Polymerase III metabolism
RNA, Fungal genetics
RNA, Fungal metabolism
RNA, Messenger genetics
RNA, Messenger metabolism
RNA, Transfer genetics
RNA, Transfer metabolism
RNA, Transfer, Lys genetics
RNA, Transfer, Lys metabolism
Saccharomyces cerevisiae Proteins genetics
Transcription Factors genetics
Transcription, Genetic
Fructose-Bisphosphatase metabolism
Genes, Fungal
Gluconeogenesis genetics
Saccharomyces cerevisiae genetics
Saccharomyces cerevisiae metabolism
Saccharomyces cerevisiae Proteins metabolism
Transcription Factors metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 1879-0038
- Volume :
- 526
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Gene
- Publication Type :
- Academic Journal
- Accession number :
- 23657116
- Full Text :
- https://doi.org/10.1016/j.gene.2013.04.055