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  • 1
    Electronic Resource
    Electronic Resource
    The FUR1 gene of Saccharomyces cerevisiae: cloning, structure and expression of wild-type and mutant alleles
    Amsterdam : Elsevier
    Gene 88 (1990), S. 149-157 
    Details
    ISSN: 0378-1119
    Keywords: Recombinant DNA ; nucleotide sequence enzymatic activities ; uracil phosphoribosyltransferase
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0378-1119(90)90026-N
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  • 2
    Electronic Resource
    Electronic Resource
    The ORF YBL042 of Saccharomyces cerevisiae encodes a uridine permease (1998)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 159 (1998), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The purpose of this work was to identify the function of an open reading frame called YBL042, found during the systematic sequencing of Saccharomyces cerevisiae's chromosome II. The YBL042 gene product shows 70% similarity with the uracil permease and the allantoin permease encoded by FUR4 and DAL4, respectively. The mutation constructed by disruption of this ORF is allelic to the FUI1 gene previously described as encoding the uridine permease but not cloned yet. A strain carrying the disrupted allele and a fui1 mutant exhibit the same phenotype as they do not grow on a medium containing uridine as the sole source of pyrimidines and as they are resistant to 10−3 M 5-fluorouridine (5FUI), a toxic analog of uridine. Even though the FUI1 gene has a multicopy suppressor effect on uracil transport, its product does not seem to be involved in this transport, in contrast to the FUR4 gene product which is involved in uridine transport. Moreover, the FUI1 gene product does not play any role in allantoin transport.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1998.tb12843.x
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  • 3
    Electronic Resource
    Electronic Resource
    Delta sequence of Ty1 transposon can initiate transcription of the distal part of the URA2 gene complex in Saccharomyces cerevisiae (1997)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 148 (1997), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Expression of a silent aspartate transcarbamylase (ATCase) domain can occur by insertion of a Ty1 retrotransposon within the coding sequence of a mutated ura2 allele. This unusual type of Ty-mediated gene activation is possible as the URA2 gene product is a multifunctional protein containing the carbamoyl phosphate synthetase (CPSase), the ATCase and a cryptic dihydroorotase (DHOase) domain. The region in which transcription of the corresponding allele is initiated was determined by RT-PCR experiments. Expression is initiated by a sequence located in the δ element of the Ty1 and not by a sequence of the URA2 gene itself This situation differs with the Ty-mediated gene activation described thus far, in which the transposon substitutes only the 5′ regulatory sequences and in which the normal transcription start point is used. The corresponding protein carries both the DHOase-like domain and the ATCase domain, suggesting that the DHOase-like domain is at least involved in the architecture of the protein and necessary to render the ATCase domain functional.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1997.tb10269.x
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  • 4
    Electronic Resource
    Electronic Resource
    Cloning and sequencing of URA10, a second gene encoding orotate phosphoribosyl transferase in Saccharomyces cerevisiae (1990)
    Springer
    Current genetics 17 (1990), S. 105-111 
    Details
    ISSN: 1432-0983
    Keywords: Saccharomyces cerevisiae ; Orotate phosphoribosyl transferase ; Nucleotide sequence-5-phosphoribosyl 1-pyrophosphate (5PRPP)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Orotate phosphoribosyl transferase (OPRTase) catalyses the transformation of orotate to OMP in the pyrimidine pathway. In the yeast Saccharomyces cerevisiae, the URA5 gene is known to encode this enzyme activity. In this paper we present the cloning and sequencing of a yeast gene, named URA10, encoding a second OPRTase enzyme. Comparison of the predicted amino acid sequences between URA5 and URA10 genes shows more than 75% similarity. These sequences have also been compared to those of Escherichia coli, Podospora anserina, Sordaria macrospora and Dictyostelium discoideum. Remarkable similarities in the primary structure of these proteins have been found. Gene disruption experiments revealed that URA10 gene expression is responsible for the leaky phenotype of a ura5 mutant. Assays of OPRTase activity in extracts from ura5 and ura10 mutants indicate that the URA10 product contributes only 20% of the total activity found in wild type cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00312853
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  • 5
    Electronic Resource
    Electronic Resource
    Regulation of the pyrimidine salvage pathway by the FUR1 gene product of Saccharomyces cerevisiae (1991)
    Springer
    Current genetics 19 (1991), S. 333-337 
    Details
    ISSN: 1432-0983
    Keywords: Saccharomyces cerevisiae ; Pyrimidine salvage pathway ; Semi-dominant mutants ; FUR1 ; Uracil phosphoribosyl transferase ; Regulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary In Saccharomyces cerevisiae, the protein encoded by the FUR1 gene is absolutely required for the expression of uracil phosphoribosyl transferase activity. The occurrence of semi-dominant mutations for 5-fluorouracil-(5FU)-resistance at this locus led us to clone and sequence the semi-dominant fur 1–5 allele. A single point mutation, resulting in the substitution of arginine 134 for serine, is responsible for this mutant phenotype. The fur 1–5 allele is transcribed and expressed at the same level as the wild-type allele. But, in contrast with the wild-type, the UPR Tase activity of the fur 1–5 mutant strain is stimulated in vitro by UTP and does not, therefore, correspond to a loss of feedback of UPR Tase activity. We found that uracil, as a free base, induces a significative increase in transcription and UPR Tase activity in a wild-type strain as well as in uracil-overproducing mutants which principally explains the high efficiency of the pyrimidine salvage pathway in S. cerevisiae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00309592
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  • 6
    Electronic Resource
    Electronic Resource
    Reactivation of the ATCase domain of the URA2 gene complex: a positive selection method for Ty insertions and chromosomal rearrangements in Saccharomyces cerevisiae (1995)
    Springer
    Molecular genetics and genomics 246 (1995), S. 767-773 
    Details
    ISSN: 1617-4623
    Keywords: Ty retrotransposon ; Duplication ; Saccharomyces cerevisiae ; ATCase ; URA2
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Genetic rearrangements such as deletions or duplications of DNA sequences are rarely detected in the yeast Saccharomyces cerevisiae. We have developed a screening system using the URA2 gene coding for the bi-functional CPSase-ATCase (carbamyl phosphate synthetase — aspartate transcarbamylase) to select positively for these kinds of events. Nonsense mutations in the CPSase region cause a complete loss of the ATCase activity because of their strong polar effect. Thirty-seven ATCase+ revertants were isolated from a strain containing three nonsense mutations in the proximal CPSase region. Genetic and structural analysis of the URA2 locus in these strains allowed us to characterize two major classes of revertants. In the first, an entire copy of a Ty transposon was found to be inserted in the CPSase coding domain. This event, which represents a new form of Ty-mediated gene activation was further analysed by mapping the Ty integration site in 26 strains. In a second class of revertants, we observed chromosomal rearrangements and, in particular, duplication of the ATCase region and its integration in a new chromosomal environment in which this sequence becomes active.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00290725
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  • 7
    Electronic Resource
    Electronic Resource
    Structure and expression of the URA5 gene of Saccharomyces cerevisiae (1989)
    Springer
    Molecular genetics and genomics 215 (1989), S. 455-462 
    Details
    ISSN: 1617-4623
    Keywords: Saccharomyces cerevisiae ; Orotate phosphoribosyl transferase ; Nucleotide sequence ; Transcription ; Regulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The URA5 gene of Saccharomyces cerevisiae encodes orotate phosphoribosyl transferase (EC 2.4.2.10; OPRTase) which catalyses the transformation of orotate to OMP in the pyrimidine pathway. We present in this paper the cloning and the sequencing of this gene, the last in the yeast pyrimidine pathway to be cloned. We have deduced the protein sequence of the OPRTase of S. cerevisiae from the DNA sequence and compared it to that of Escherichia coli, Podospora anserina and Dictyostelium discoideum. Some important similarities in the structure of these four proteins have been found. Finally, we have quantified the transcription of the URA5 gene in different physiological conditions and confirmed that it was not under the control of UTP or any intermediary product of the pathway.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00427043
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  • 8
    Electronic Resource
    Electronic Resource
    Recovery of gene function by gene duplication in Saccharomyces cerevisiae (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Yeast 11 (1995), S. 169-177 
    Details
    ISSN: 0749-503X
    Keywords: Saccharomyces cerevisiae ; chromosome ; ATCase ; URA2 ; Life and Medical Sciences ; Genetics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: A prototroph revertant (Rev9) selected from an ATCase- mutant of the URA2 gene containing three nonsense mutations was shown to contain two ATCase coding sequences. We cloned both ATCase coding areas to show that the duplicated locus (dl9) was the only functional one. Its size corresponded roughly to the second half of the URA2 wild-type gene. Sequence analysis of the 5′ end of dl9 indicated that this duplicated sequence was inserted within the intergenic region close to the MRS3 gene and was transcribed from an unknown promoter divergently from the MRS3 gene. The event leading to the revertant strain Rev9 included a rearrangement that increased the size of chromosome X by about 60 kb. In agreement with such a rearrangement, recombination was undetectable in the vicinity of the locus dl9. Genetic mapping confirms that the MRS3 gene is 2 cM distal to the URA2 gene on the right arm of chromosome X.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/yea.320110208
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  • 9
    Electronic Resource
    Electronic Resource
    The Characterization of Two New Clusters of Duplicated Genes Suggests a ‘Lego’ Organization of the Yeast Saccharomyces cerevisiae Chromosomes (1997)
    New York, NY [u.a.] : Wiley-Blackwell
    Yeast 13 (1997), S. 861-869 
    Details
    ISSN: 0749-503X
    Keywords: Saccharomyces cerevisiae ; cluster ; duplication ; genome sequencing ; evolution ; Life and Medical Sciences ; Genetics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: The systematic sequencing of 42 485 bp of yeast chromosome VII (nucleotides 377948 to 420432) has revealed the presence of 27 putative open reading frames (ORFs) coding for proteins of at least 100 amino acids. The degree of redundancy observed is elevated since five of the 27 ORFs are duplications of a previously identified gene. These duplicated copies may be classified in two types of cluster organization. The first type includes genes sharing a significant level of identity in the amino acid sequences of their predicted protein product. They are recovered on two different chromosomes, transcribed in the same orientation and the distance between them is conserved. The second type of cluster is based on one gene unit tandemly repeated. This duplication is itself repeated elsewhere in the genome. The level of nucleic acid identity is high within the coding sequence and the non-coding region between the two repeats. In addition, the basic gene unit is recovered many times in the genome and is a component of a multigene family of unknown function. These organizations in clusters of genes suggest a ‘Lego organization’ of the yeast chromosomes, as recently proposed for the genome of plants (Moore, 1995). The sequence is deposited in the Yeast Genome Databank under Accession Number from Z72562 to Z72586. © 1997 John Wiley & Sons, Ltd.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 10
    Electronic Resource
    Electronic Resource
    The uracil permease of Schizosaccharomyces pombe: A representative of a family of 10 transmembrane helix transporter proteins of yeasts (1998)
    New York, NY [u.a.] : Wiley-Blackwell
    Yeast 14 (1998), S. 1051-1059 
    Details
    ISSN: 0749-503X
    Keywords: Schizosaccharomyces pombe ; Saccharomyces cerevisiae ; uracil permease ; transmembrane helices ; Life and Medical Sciences ; Genetics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: The uracil permease gene of Schizosaccharomyces pombe was cloned and sequenced. The deduced protein sequence shares strong similarities with five open reading frames from Saccharomyces cerevisiae, namely the uracil permease encoded by the FUR4 gene, the allantoin permease encoded by DAL4, a putative uridine permease (YBL042C) and two unknown ORFs YOR071c and YLR237w.A topological model retaining ten transmembrane helices, based on predictions and on experimental data established for the uracil permease of S. cerevisiae by Galan and coworkers (1996), is discussed for the four closest proteins of this family of transporters. The sequence of the uracil permease gene of S. pombe has been deposited in the EMBL data bank under Accession Number X98696. © 1998 John Wiley & Sons, Ltd.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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