Temperature sensitivity in the respiratory-deficient mutants of yeast (Saccharomyces cerevisiae)

1970 ◽  
Vol 26 (2) ◽  
pp. 209-210 ◽  
Author(s):  
G. F. Gause ◽  
L. I. Kusovkova
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Temperature Sensitivity ◽  
Yeast Saccharomyces Cerevisiae ◽  
Respiratory Deficient

scholarly journals Underproduction of the Largest Subunit of RNA Polymerase II Causes Temperature Sensitivity, Slow Growth, and Inositol Auxotrophy in Saccharomyces cerevisiae

Genetics ◽  
1996 ◽  
Vol 142 (3) ◽  
pp. 737-747 ◽  
Author(s):  
Jacques Archambault ◽  
David B Jansma ◽  
James D Friesen
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Steady State ◽  
Rna Polymerase ◽  
Rna Polymerase Ii ◽  
Reporter Gene ◽  
Growth Medium ◽  
Temperature Sensitivity ◽  
Slow Growth ◽  
Yeast Saccharomyces Cerevisiae ◽  
Genes Encoding

Abstract In the yeast Saccharomyces cerevisiae, mutations in genes encoding subunits of RNA polymerase II (RNAPII) often give rise to a set of pleiotropic phenotypes that includes temperature sensitivity, slow growth and inositol auxotrophy. In this study, we show that these phenotypes can be brought about by a reduction in the intracellular concentration of RNAPII. Underproduction of RNAPII was achieved by expressing the gene (RPO21), encoding the largest subunit of the enzyme, from the LEU2 promoter or a weaker derivative of it, two promoters that can be repressed by the addition of leucine to the growth medium. We found that cells that underproduced RPO21 were unable to derepress fully the expression of a reporter gene under the control of the INO1 UAS. Our results indicate that temperature sensitivity, slow growth and inositol auxotrophy is a set of phenotypes that can be caused by lowering the steady-state amount of RNAPII; these results also lead to the prediction that some of the previously identified RNAPII mutations that confer this same set of phenotypes affect the assembly/stability of the enzyme. We propose a model to explain the hypersensitivity of INO1 transcription to mutations that affect components of the RNAPII transcriptional machinery.

scholarly journals Sug1 modulates yeast transcription activation by Cdc68.

1995 ◽  
Vol 15 (11) ◽  
pp. 6025-6035 ◽  
Author(s):  
Q Xu ◽  
R A Singer ◽  
G C Johnston
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Transcriptional Regulation ◽  
Molecular Characterization ◽  
Temperature Sensitivity ◽  
Null Allele ◽  
Transcription Activation ◽  
Suppressor Gene ◽  
Yeast Saccharomyces Cerevisiae

The Cdc68 protein is required for the transcription of a variety of genes in the yeast Saccharomyces cerevisiae. In a search for proteins involved in the activity of the Cdc68 protein, we identified four suppressor genes in which mutations reverse the temperature sensitivity caused by the cdc68-1 allele. We report here the molecular characterization of mutations in one suppressor gene, the previously identified SUG1 gene. The Sug1 protein has been implicated in both transcriptional regulation and proteolysis. sug1 suppressor alleles reversed most aspects of the cdc68-1 mutant phenotype but did not suppress the lethality of a cdc68 null allele, indicating that sug1 suppression is by restoration of Cdc68 activity. Our evidence suggests that suppression by sug1 is unlikely to be due to increased stability of mutant Cdc68 protein, despite the observation that Sug1 affected proteolysis of mutant Cdc68. We report here that attenuated Sug1 activity strengthens mutant Cdc68 activity, whereas increased Sug1 activity further inhibits enfeebled Cdc68 activity, suggesting that Sug1 antagonizes the activator function of Cdc68 for transcription. Consistent with this hypothesis, we find that Sug1 represses transcription in vivo.

scholarly journals PATTERNS OF GENETIC AND PHENOTYPIC SUPPRESSION OF lys2 MUTATIONS IN THE YEAST SACCHAROMYCES CEREVISIAE

Genetics ◽  
1979 ◽  
Vol 93 (1) ◽  
pp. 67-79
Author(s):  
Bharat B Chattoo ◽  
Edward Palmer ◽  
Bun-Ichiro Ono ◽  
Fred Sherman
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Amino Acid ◽  
Gene Product ◽  
Temperature Sensitivity ◽  
Mode Of Action ◽  
Aminoglycoside Antibiotic ◽  
Yeast Saccharomyces Cerevisiae ◽  
Nonsense Mutations ◽  
Common Mode ◽  
Phenotypic Suppression

ABSTRACT A total of 358 lys2 mutants of Saccharomyces cerevisiae have been characterized for suppressibility by the following suppressors: UAA and UAG suppressors that insert tyrosine, serine or leucine; a putative UGA suppressor; an omnipotent suppressor SUP46; and a frameshift suppressor SUF1-1. In addition, the lys2 mutants were examined for phenotypic suppression by the aminoglycoside antibiotic paromomycin, for osmotic remediability and for temperature sensitivity. The mutants exhibited over 50 different patterns of suppression and most of the nonsense mutants appeared similar to nonsense mutants previously described. A total of 24% were suppressible by one or more of the UAA suppressors, 4% were suppressible by one or more of the UAG suppressors, while only one was suppressible by the UGA suppressor and only one was weakly suppressible by the frameshift suppressor. One mutant responded to both UAA and UAG suppressors, indicating that UAA or UAG mutations at certain rare sites can be exceptions to the specific action of UAA and UAG suppressors. Some of the mutants appeared to require certain types of amino acid replacements at the mutant sites in order to produce a functional gene product, while others appeared to require suppressors that were expressed at high levels. Many of the mutants suppressible by SUP46 and paromomycin were not suppressible by any of the UAA, UAG or UGA suppressors, indicating that omnipotent suppression and phenotypic suppression need not be restricted to nonsense mutations. All of the mutants suppressible by SUP46 were also suppressible by paromomycin, suggesting a common mode of action of omnipotent suppression and phenotypic misreading.

scholarly journals Adaptive regrowth in respiratory deficient strain of yeast Saccharomyces cerevisiae due to deletion of YKU70 gene

2020 ◽  
Vol 82 (3) ◽  
pp. 53-58
Author(s):  
Yu. Rymar ◽  
S. Rushkovsky ◽  
S. Demidov ◽  
L. Velykozhon ◽  
O. Pronina ◽  
...  
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Cell Cycle ◽  
Genome Stability ◽  
Malignant Tumors ◽  
Nuclear Genome ◽  
Pcr Analysis ◽  
Restrictive Temperature ◽  
Yeast Saccharomyces Cerevisiae ◽  
Petite Mutant ◽  
Respiratory Deficient

It is known that significant causes of malignant tumors are destabilization of the nuclear genome and mitochondrial dysfunction. Adaptive regrowth in yeast colonies (the appearance of cell subpopulations more adapted to unfavorable conditions under conditions of the death of the original culture) is used as a model of the initial stages of carcinogenesis. To study the features of the formation of adaptive regrowth, a reparationdefective and respiratory-deficient yeast strain of Saccharomyces cerevisiae was created. The thermosensitive mutation in the yku70 gene was used as an inducer of nuclear genome instability (at 37 оC it causes cell cycle arrest due to a reduction of the length of telomeric regions of chromosomes). Damage to the mitochondrial DNA of the ∆yku70 strain led to its respiratory deficiency (petite mutation). The isolated petite mutant ∆yku70 strain was cultured at optimal 28 оC and restrictive 37 оC temperatures, the state of the cell suspension was evaluated by light and fluorescence microscopy, to determine the viability of cells was used the analysis of microcolonies growth. Isolation of adaptive regrowth clones and analysis of their properties by the method of serial dilutions were conducted. To assess the genome stability of selected clones of adaptive regrowth, PCR analysis of the microsatellite sequences YOR267C, SC8132X, SCPTSY7 was conducted. When culturing the petite mutant of the strain ∆yku70 at a restrictive temperature of 37 оC for 7 days, the formation of viable subpopulations was detected, which can overcome the arrest of the cell cycle in the G2 / M phase. Further analysis of the isolated clones of adaptive regrowth showed that they differ in cell survival at restrictive temperature, resistance to UV radiation and the ability to form adaptive regrowth on colonies. In the analysis of microsatellite repeats in adaptive regrowth clones, no manifestations of instability of the studied sequences were detected.

Improvement in ethanol production using respiratory deficient phenotype of a wild type yeast Saccharomyces cerevisiae ITV-01

2012 ◽  
Vol 37 (1) ◽  
pp. 197-201 ◽  
Author(s):  
B. Ortiz-Muñiz ◽  
O. Carvajal-Zarrabal ◽  
B. Aguilar ◽  
M.G. Aguilar-Uscanga
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Ethanol Production ◽  
Wild Type ◽  
Yeast Saccharomyces Cerevisiae ◽  
Wild Type Yeast ◽  
Respiratory Deficient

PREPARASI DEINOCOCCUS RADIODURANS DAN KHAMIR DALAM MATERIAL KECAP L-DRYING SEBAGAI BAHAN UJI PROFISIENSI

2016 ◽  
Vol 13 (1) ◽  
pp. 93
Author(s):  
Titin Yulinery ◽  
Ratih M.Dewi
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Deinococcus Radiodurans ◽  
Test Preparation ◽  
Quality Parameters ◽  
Soy Sauce ◽  
Yeast Saccharomyces Cerevisiae ◽  
Microbiological Test ◽  
Bacterial Contaminants ◽  
Minimum Number ◽  
Important Quality

Tes kemampuan adalah salah satu kegiatan penting dalam pengendalian mutu dan jaminan kualitas mikrobiologi laboratorium untuk mengukur kompetensi analis dan analisis uji profisiensi membutuhkan persiapan Model mikroorganisme adalah kualitas standar dan validitas. Mikrobiologi uji kualitas produk kedelai utama diarahkan pada kehadiran Saccharomyces cerevisiae ragi (S. cerevisiae), S. Bailli, S. rouxii dankontaminan bakteri seperti Bacillus dan Deinococcus. Jenis ragi dan bakteri yang terlibat dalam proses dan dapat menjadi salah satu parameter kualitas penting dalam persiapan yang dihasilkan. Jumlah dan viabilitas bakteri dan ragi menjadi parameter utama dalam proses persiapan bahan uji. Jumlah tersebut adalah jumlah minimum yang berlaku dapat dianalisis. Jumlah ini harus dibawah 10 CFU diperlukan untuk menunjukkan tingkat hygienitas proses dan tingkat minimal kontaminasi. Viabilitas bakteri dan bahan tes ragi persiapan untuk tes kemahiran kecap yang diawetkan dengan L-pengeringan adalah teknik Deinococcus radiodurans (D. radiodurans) 16 tahun, 58 tahun S. cerevisiae, dan S. roxii 13 tahun. kata kunci: Viabilitas, Deinococcus, khamir, L-pengeringan, Proficiency AbstractProficiency test is one of the important activities in quality control and quality assurance microbiology laboratory for measuring the competence of analysts and analysis Proficiency test requires a model microorganism preparations are standardized quality and validity. Microbiological test of the quality of the main soy products aimed at thepresence of yeast Saccharomyces cerevisiae (S. cerevisiae), S. bailli, S. rouxii and bacterial contaminants such as Bacillus and Deinococcus. Types of yeasts and bacteria involved in the process and can be one of the important quality parameters in the preparation produced. The number and viability of bacteria and yeasts become themain parameters in the process of test preparation materials. The amount in question is the minimum number that is valid can be analyzed. This amount must be below 10 CFU required to indicate the level of hygienitas process and the minimum level of contamination. Viability of bacteria and yeast test preparation materials for proficiencytest of soy sauce that preserved by L-drying technique is Deinococcus radiodurans ( D. radiodurans ) 16 years, 58 years S. cerevisiae, and S. roxii 13 years. key words : Viability, Deinococcus, Khamir, L-drying, Proficiency

INTERACTION OF THE HIM1 GENE PRODUCT WITH HELICASES Srs2 (RadH) AND Mph1 YEAST SACCHAROMYCES CEREVISIAE

Tsitologiya ◽  
2018 ◽  
Vol 60 (7) ◽  
pp. 555-557 ◽  
Author(s):  
E. A. Alekseeva ◽  
◽  
T. A. Evstyukhina ◽  
V. T. Peshekhonov ◽  
V. G. Korolev ◽  
...  
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Gene Product ◽  
Yeast Saccharomyces Cerevisiae
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