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  • 1
    Electronic Resource
    Electronic Resource
    Isolation, characterization and chromosomal mapping of an actin gene from the primitive red alga Cyanidioschyzon merolae (1995)
    Springer
    Current genetics 28 (1995), S. 484-490 
    Details
    ISSN: 1432-0983
    Keywords: Actin gene ; Cyanidioschyzon merolae ; Pulsed-field gel electrophoresis (PFGE) ; Phylogenetic tree
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Based on the results of cytological studies, it has been assumed that Cyanidioschyzon merolae does not contain actin genes. However, Southern hybridization of C. merolae cell-nuclear DNA with a yeast actin-gene probe has suggested the presence of an actin gene in the C. merolae genome. In the present study, an actin gene was isolated from a C. merolae genomic library using a yeast actin-gene probe. The C. merolae actin gene has no intron. The predicted actin is composed of 377 amino acids and has an estimated molecular mass of 42003 Da. Southern hybridization indicated that the C. merolae genome contains only one actin gene. This gene is transcribed at a size of 2.4 kb. When Southern hybridization was performed with C. merolae chromosomes separated by pulsed-field gel electrophoresis, a band appeared on unseparated chromosomes XI and XII. A phylogenetic tree based on known eucaryote actin-gene sequences revealed that C. merolae diverged after the division of Protozoa, but before the division of Fungi, Animalia and Chlorophyta.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00310820
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  • 2
    Electronic Resource
    Electronic Resource
    A novel mutation occurring in the PHO80 gene suppresses the PHO4 c mutations of Saccharomyces cerevisiae (1992)
    Springer
    Current genetics 21 (1992), S. 95-99 
    Details
    ISSN: 1432-0983
    Keywords: PHO ; Saccharomyces ; Protein-protein interaction ; Regulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We have isolated suppressors of a PHO4 c (a positive regulator) mutant which normally confers weak constitutivity for acid phosphatase production on the Saccharomyces cell. One dominant suppressor (PHO80-2) was found to be an allele of PHO80 (a negative regulator) that changes G to A, resulting in substitution of isoleucine for methionine 42 of the Pho80 protein. Substitution of valine (PHO80-3) or leucine (PHO80-4) for the same methionine by site-directed mutagenesis also suppressed PHO c. Suppression by PHO80-2) did show some allele specificity. From these results we were able to delimit the region of PHo80 which may interact with the Pho4 protein.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00318466
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  • 3
    Electronic Resource
    Electronic Resource
    Construction of a marker gene cassette which is repeatedly usable for gene disruption in yeast (1995)
    Springer
    Current genetics 27 (1995), S. 293-297 
    Details
    ISSN: 1432-0983
    Keywords: Gene disruption ; Site-specific recombination ; Yeast plasmid ; Schizosaccharomyces pombe
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A disruption cassette has been constructed containing the LEU2 gene flanked by directly repeated sitespecific recombination sites of the yeast plasmid, pSB3, which resembles the 2 μm DNA of Saccharomyces cerevisiae. A disruption constructed by inserting this DNA fragment acquires a Leu+ phenotype, which can be easily removed by expressing the FLP-PSB3 gene encoding the site-specific recombinase of pSB3. A test was made using a Schizosaccharomyces pombe host. The ura4 + gene of S. pombe was replaced with the ura4::LEU2 gene constructed by inserting the disruption cassette into the ura4 + gene. Then, the FLP-pSB3 gene driven by the nmt1 + promoter was introduced into this disruptant. Upon de-repression of the nmt1 promoter by removing thiamine from the medium, the rate of appearance of Leu- was increased. As expected the ura4 + locus underwent a structural change. Thus, the FLP-pSB3 protein and its target site can function adequately in S. pombe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00352095
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  • 4
    Electronic Resource
    Electronic Resource
    A dominant interfering mutation in RAS1 of Saccharomyces cerevisiae (1993)
    Springer
    Molecular genetics and genomics 241 (1993), S. 280-286 
    Details
    ISSN: 1617-4623
    Keywords: Yeast RAS ; RAS-CAMP pathway ; Saccharomyces cerevisiae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A mutant allele of RAS1 that dominantly interferes with the wild-type Ras function in the yeast Saccharomyces cerevisiae was discovered during screening of mutants that suppress an ira2 disruption mutation. A single amino acid substitution, serine for glycine at position 22, was found to cause the mutant phenotype. The inhibitory effect of the RAS1 Ser22 gene could be overcome either by overexpression of CDC25 or by the ira2 disruption mutation. These results suggest that the RAS1Ser22 gene product interferes with the normal interaction of Ras with Cdc25 by forming a dead-end complex between Ras1Ser22 and Cdc25 proteins.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00284679
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  • 5
    Electronic Resource
    Electronic Resource
    Isolation and characterization of temperature-sensitiveplc1 mutants of the yeastSaccharomyces cerevisiae (1995)
    Springer
    Molecular genetics and genomics 247 (1995), S. 148-156 
    Details
    ISSN: 1617-4623
    Keywords: Saccharomyces cerevisiae ; Phosphoinositide-specific phospholipase C ; Temperature-sensitive mutant ; PLC1
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract ThePLC1 gene of the yeastSaccharomyces cerevisiae has been discovered to encode a homolog of mammalian phosphoinositide-specific phospholipase C (PLC). Five temperature-sensitiveplc1 mutants were isolated by in vitro mutagenesis with subsequent plasmid shuffling. All of the amino acid substitutions that caused a temperature-sensitive growth phenotype were located in the X or the Y region, both of which are conserved among PLC isoenzymes. The PLC activity of all products of mutantplc1 genes was dramatically lower than that of the wild-type product, indicating that PLC activity itself is important for cell growth. At the restrictive temperature,plc1 mutant cells ceased growth at random times during the cell cycle, a result that suggests thatPLC1 is required at several or all stages of the cell cycle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00705644
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  • 6
    Electronic Resource
    Electronic Resource
    PHO85, a negative regulator of the PHO system, is a homolog of the protein kinase gene, CDC28, of Saccharomyces cerevisiae (1988)
    Springer
    Molecular genetics and genomics 214 (1988), S. 162-164 
    Details
    ISSN: 1617-4623
    Keywords: CDC28 ; Phosphate regulation ; PHO85 ; Protein kinase ; Saccharomyces cerevisiae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The product of the PHO85 gene, which encodes one of the negative regulatory factors of the PHO system in Saccharomyces cerevisiae, shows significant amino acid sequence homology with the CDC28 protein kinase. However, overexpressing PHO85 did not suppress the temperature sensitive phenotype of the cdc28-1 mutation. The nucleotide sequence of the PHO85 gene strongly suggests the presence of an intron near the sequence encoding the N-terminal region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00340196
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  • 7
    Electronic Resource
    Electronic Resource
    Two new genes controlling the constitutive acid phosphatase synthesis in Saccharomyces cerevisiae (1975)
    Springer
    Molecular genetics and genomics 141 (1975), S. 81-83 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Two new classes of mutants, phoF and phoG, lacking the constitutive acid phosphatase activity, were isolated. They both complemented each other and the phoC mutation. No linkage was detected among these three complementary genes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332380
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  • 8
    Electronic Resource
    Electronic Resource
    Genes coding for the structure of the acid phosphatases in Saccharomyces cerevisiae (1975)
    Springer
    Molecular genetics and genomics 143 (1975), S. 65-70 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The phoE locus, one of the loci in which mutations lack the activity for repressible acid phosphatase, was found to be the structural gene for the enzyme by examining the enzymic characteristics of repressible acid phosphatase activity using cell extracts prepared from the leaky phoE mutants, the PHOE revertants and the PHOE recombinants between the different phoE mutants. Other evidence which strongly suggests that the phoC locus is coding for the constitutive acid phosphatase was obtained by a similar investigation. Although the phoC and phoE loci are tightly linked, they were separable by meiotic recombination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00269421
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  • 9
    Electronic Resource
    Electronic Resource
    Disturbance of the machinery for the gene expression by acidic pH in the repressible acid phosphatase system of Saccharomyces cerevisiae (1978)
    Springer
    Molecular genetics and genomics 162 (1978), S. 139-149 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary When the pH of growth medium containing a limited amount of inorganic phosphate is kept below 3.0, cells of Saccharomyces cerevisiae produce repressible alkaline phosphatase but no repressible acid phosphatase. The same cells produce acid phosphatase immediately on shifting the medium pH to 4.0 or above. Like intact cells, spheroplasts prepared from cells grown at pH 3.0 or 4.5 in medium with a limited amount of inorganic phosphate in suspension begin production of acid phosphatase immediately after pH shift from below 3.0 to 4.0, whereas spheroplasts from cells grown in inorganic phosphate-rich medium showed a prolonged lag period (3 h). The enzyme formation on the pH shift was sensitive to cycloheximide. No significant differences could be detected in cellular growth or in incorporation of 3H-L-lysine or 14C-adenine between cells cultivated at pH 3.0 and 4.5. These results along with the fact that the expression of structural genes of repressible acid and alkaline phosphatases is controlled by a common genetic regulatory system, at least in part, indicate that the genetic regulatory system operates to express the structural genes even at low pH, though the expression of repressible acid phosphatase is interrupted. Coupled experiments of temperature and pH shifts with the temperature-sensitive mutants of the regulatory genes suggest that the acidic pH affects the function of the cytoplasmic products of those genes in the expression of the structural gene. Based on these observations, a revised model involving the simultaneous functioning of the regulatory factors was suggested for the genetic regulation of repressible acid phosphatase senthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00267870
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  • 10
    Electronic Resource
    Electronic Resource
    An insertion mutation associated with constitutive expression of repressible acid phosphatase in Saccharomyces cerevisiae (1983)
    Springer
    Molecular genetics and genomics 191 (1983), S. 339-346 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The PHO83 mutation in Saccharomyces cerevisiae, which had been detected on the basis of constitutive production of repressible acid phosphatase and mapped at the end of the PHO5 locus, was analysed by Southern hybridization with cloned DNA fragments of the PHO5 gene as probe. It was shown that this mutant has a DNA insertion of about 6 kilobase pairs, probably in the 5′-noncoding region of the PHO5 gene. Production of repressible acid phosphatase by the PHO83 mutant is partially independent of the function of the PHO2 and PHO4 genes, the positive regulatory genes whose functions are indispensable for PHO5 expression. PHO83 mutants are constitutive in a or α cells, either haploid or diploid, but not in non-mating cells, MATa/MATα or a certain sterile mutation. These observations strongly suggest that the PHO83 mutation is caused by insertion of a Ty element in the 5′-noncoding region of the PHO5 gene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00425743
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