scholarly journals Expression of the yeast NAM9 gene coding for mitochondrial ribosomal protein.

1997 ◽  
Vol 44 (2) ◽  
pp. 251-258 ◽  
Author(s):  
M Boguta ◽  
A Chacińska ◽  
M Murawski ◽  
B Szcześniak
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Carbon Source ◽  
Ribosomal Protein ◽  
Gene Dosage ◽  
Ribosomal Protein Genes ◽  
Mitochondrial Ribosomal Protein ◽  
Gene Coding ◽  
In Cells

We studied expression of the NAM9 gene of Saccharomyces cerevisiae that was previously reported to code for a mitochondrial ribosomal protein. Increase in NAM9 gene dosage is accompanied by the increase in both mRNA and protein. The levels of the NAM9 transcript and protein are both reduced in cells growing on glucose as compared to cells growing on galactose as a carbon source. Nam9p accumulates to the same level in rho(o) and rho(+) cells. These results confirm previous data indicating diverse regulation of different mitochondrial ribosomal protein genes and suggest that expression of Nam9p is not co-ordinated with the expression of other mitochondrial ribosomal components.

scholarly journals Gene dosage alteration of L2 ribosomal protein genes in Saccharomyces cerevisiae: effects on ribosome synthesis.

1988 ◽  
Vol 8 (11) ◽  
pp. 4792-4798 ◽  
Author(s):  
A Lucioli ◽  
C Presutti ◽  
S Ciafrè ◽  
E Caffarelli ◽  
P Fragapane ◽  
...  
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Ribosomal Protein ◽  
Gene Dosage ◽  
Transcriptional Level ◽  
Ribosomal Protein Genes ◽  
Promoter Regions ◽  
Phenotypic Alteration ◽  
Mrna Pool ◽  
Gene Copies ◽  
The Difference

In Saccharomyces cerevisiae, the genes coding for the ribosomal protein L2 are present in two copies per haploid genome. The two copies, which encode proteins differing in only a few amino acids, contribute unequally to the L2 mRNA pool: the L2A copy makes 72% of the mRNA, while the L2B copy makes only 28%. Disruption of the L2B gene (delta B strain) did not lead to any phenotypic alteration, whereas the inactivation of the L2A copy (delta A strain) produced a slow-growth phenotype associated with decreased accumulation of 60S subunits and ribosomes. No intergenic compensation occurred at the transcriptional level in the disrupted strains; in fact, delta A strains contained reduced levels of L2 mRNA, whereas delta B strains had almost normal levels. The wild-type phenotype was restored in the delta A strains by transformation with extra copies of the intact L2A or L2B gene. As already shown for other duplicated genes (Kim and Warner, J. Mol. Biol. 165:79-89, 1983; Leeret al., Curr. Genet. 9:273-277, 1985), the difference in expression of the two gene copies could be accounted for via differential transcription activity. Sequence comparison of the rpL2 promoter regions has shown the presence of canonical HOMOL1 boxes which are slightly different in the two genes.

Gene dosage alteration of L2 ribosomal protein genes in Saccharomyces cerevisiae: effects on ribosome synthesis

1988 ◽  
Vol 8 (11) ◽  
pp. 4792-4798
Author(s):  
A Lucioli ◽  
C Presutti ◽  
S Ciafrè ◽  
E Caffarelli ◽  
P Fragapane ◽  
...  
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Ribosomal Protein ◽  
Gene Dosage ◽  
Transcriptional Level ◽  
Ribosomal Protein Genes ◽  
Promoter Regions ◽  
Phenotypic Alteration ◽  
Mrna Pool ◽  
Gene Copies ◽  
The Difference

In Saccharomyces cerevisiae, the genes coding for the ribosomal protein L2 are present in two copies per haploid genome. The two copies, which encode proteins differing in only a few amino acids, contribute unequally to the L2 mRNA pool: the L2A copy makes 72% of the mRNA, while the L2B copy makes only 28%. Disruption of the L2B gene (delta B strain) did not lead to any phenotypic alteration, whereas the inactivation of the L2A copy (delta A strain) produced a slow-growth phenotype associated with decreased accumulation of 60S subunits and ribosomes. No intergenic compensation occurred at the transcriptional level in the disrupted strains; in fact, delta A strains contained reduced levels of L2 mRNA, whereas delta B strains had almost normal levels. The wild-type phenotype was restored in the delta A strains by transformation with extra copies of the intact L2A or L2B gene. As already shown for other duplicated genes (Kim and Warner, J. Mol. Biol. 165:79-89, 1983; Leeret al., Curr. Genet. 9:273-277, 1985), the difference in expression of the two gene copies could be accounted for via differential transcription activity. Sequence comparison of the rpL2 promoter regions has shown the presence of canonical HOMOL1 boxes which are slightly different in the two genes.

Protein kinase A mediates growth-regulated expression of yeast ribosomal protein genes by modulating RAP1 transcriptional activity

1994 ◽  
Vol 14 (3) ◽  
pp. 1920-1928
Author(s):  
C Klein ◽  
K Struhl
Keyword(s):  
Amino Acid ◽  
Protein Kinase ◽  
Carbon Source ◽  
Ribosomal Protein ◽  
Binding Sites ◽  
Transcriptional Activity ◽  
Amino Acid Starvation ◽  
Ribosomal Protein Genes ◽  
Regulated Expression ◽  
Kinase A

Yeast ribosomal protein genes are coordinately regulated as a function of cell growth; RNA levels decrease during amino acid starvation but increase following a carbon source upshift. Binding sites for RAP1, a multifunctional transcription factor, are present in nearly all ribosomal protein genes and are associated with growth rate regulation. We show that ribosomal protein mRNA levels are increased twofold in strains that have constitutively high levels of cyclic AMP-dependent protein kinase (protein kinase A [PKA]) activity. The PKA-dependent induction requires RAP1 binding sites, and it reflects increased transcriptional activation by RAP1. Growth-regulated transcription of ribosomal protein genes strongly depends on the ability to regulate PKA activity. Cells with constitutively high PKA levels do not show the transcriptional decrease in response to amino acid starvation. Conversely, in cells with constitutively low PKA activity, ribosomal protein mRNAs levels are lower and largely uninducible upon carbon source upshift. We suggest that modulation of RAP1 transcriptional activity by PKA accounts for growth-regulated expression of ribosomal protein genes.

Mild temperature shock alters the transcription of a discrete class of Saccharomyces cerevisiae genes

1983 ◽  
Vol 3 (3) ◽  
pp. 457-465
Author(s):  
C H Kim ◽  
J R Warner
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Ribosomal Protein ◽  
Ribosomal Proteins ◽  
Temperature Shift ◽  
Restrictive Temperature ◽  
Ribosomal Protein Genes ◽  
Wild Type ◽  
Temperature Shock ◽  
Mild Temperature ◽  
Mutant Cells

In Saccharomyces cerevisiae the synthesis of ribosomal proteins declines temporarily after a culture has been subjected to a mild temperature shock, i.e., a shift from 23 to 36 degrees C, each of which support growth. Using cloned genes for several S. cerevisiae ribosomal proteins, we found that the changes in the synthesis of ribosomal proteins parallel the changes in the concentration of mRNA of each. The disappearance and reappearance of the mRNA is due to a brief but severe inhibition of the transcription of each of the ribosomal protein genes, although the total transcription of mRNA in the cells is relatively unaffected by the temperature shock. The precisely coordinated response of these genes, which are scattered throughout the genome, suggests that either they or the enzyme which transcribes them has unique properties. In certain S. cerevisiae mutants, the synthesis of ribosomal proteins never recovers from a temperature shift. Yet both the decline and the resumption of transcription of these genes during the 30 min after the temperature shift are indistinguishable from those in wild-type cells. The failure of the mutant cells to grow at the restrictive temperature appears to be due to their inability to process the RNA transcribed from genes which have introns (Rosbash et al., Cell 24:679-686, 1981), a large proportion of which appear to be ribosomal protein genes.

Association of RAP1 binding sites with stringent control of ribosomal protein gene transcription in Saccharomyces cerevisiae

1991 ◽  
Vol 11 (5) ◽  
pp. 2723-2735 ◽  
Author(s):  
C M Moehle ◽  
A G Hinnebusch
Keyword(s):  
Gene Expression ◽  
Saccharomyces Cerevisiae ◽  
Amino Acid ◽  
Ribosomal Protein ◽  
Binding Sites ◽  
Protein Gene ◽  
Ribosomal Protein Gene ◽  
Ribosomal Protein Genes ◽  
Biosynthetic Genes ◽  
Stringent Control

An amino acid limitation in bacteria elicits a global response, called stringent control, that leads to reduced synthesis of rRNA and ribosomal proteins and increased expression of amino acid biosynthetic operons. We have used the antimetabolite 3-amino-1,2,4-triazole to cause histidine limitation as a means to elicit the stringent response in the yeast Saccharomyces cerevisiae. Fusions of the yeast ribosomal protein genes RPL16A, CRY1, RPS16A, and RPL25 with the Escherichia coli lacZ gene were used to show that the expression of these genes is reduced by a factor of 2 to 5 during histidine-limited exponential growth and that this regulation occurs at the level of transcription. Stringent regulation of the four yeast ribosomal protein genes was shown to be associated with a nucleotide sequence, known as the UASrpg (upstream activating sequence for ribosomal protein genes), that binds the transcriptional regulatory protein RAP1. The RAP1 binding sites also appeared to mediate the greater ribosomal protein gene expression observed in cells growing exponentially than in cells in stationary phase. Although expression of the ribosomal protein genes was reduced in response to histidine limitation, the level of RAP1 DNA-binding activity in cell extracts was unaffected. Yeast strains bearing a mutation in any one of the genes GCN1 to GCN4 are defective in derepression of amino acid biosynthetic genes in 10 different pathways under conditions of histidine limitation. These Gcn- mutants showed wild-type regulation of ribosomal protein gene expression, which suggests that separate regulatory pathways exist in S. cerevisiae for the derepression of amino acid biosynthetic genes and the repression of ribosomal protein genes in response to amino acid starvation.

scholarly journals Isolation of cloned DNA sequences containing ribosomal protein genes from saccharomyces cerevisiae

Cell ◽  
1979 ◽  
Vol 18 (4) ◽  
pp. 1247-1259 ◽  
Author(s):  
John L. Woolford ◽  
Lynna M. Hereford ◽  
Michael Rosbash
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Ribosomal Protein ◽  
Dna Sequences ◽  
Ribosomal Protein Genes
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