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  • 1
    ISSN: 1617-4623
    Keywords: Key words Phosphoglycerate kinase ; Cpf1p ; Rap1p ; b1p ; Abf1p
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  We have identified two new transcription factor binding sites upstream of the previously defined UAS within the phosphoglycerate kinase (PGK) gene promoter in Saccharomyces cerevisiae. These sites are bound in vitro by the multifunctional factors Cpf1p and Reb1p. We have generated targeted deletions of Rap1p, Abf1p and Reb1p binding sites in the promoter of the chromosomal copy of the PGK gene. Northern blot analysis confirmed that most PGK promoter activity is mediated through the Rap1p binding site. However, significant effects are also mediated through both the Reb1p and Abf1p sites. In contrast, when the promoter is present on a high-copy-number plasmid, both the Abf1p and Reb1p sites play no role in transcriptional activation. The role of Cpf1p was examined using a cpf1 null strain. Cpf1p was found to have little if any, effect on activation of either the chromosomal or plasmid-borne PGK gene.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1617-4623
    Keywords: Phosphoglycerate kinase ; Cpf1p ; Rap1p ; Reb1p ; Abf1p
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We have identified two new transcription factor binding sites upstream of the previously defined UAS within the phosphoglycerate kinase (PGK) gene promoter inSaccharomyces cerevisiae. These sites are bound in vitro by the multifunctional factors Cpf1p and Reb1p. We have generated targeted deletions of Rap1p, Abf1p and Reb1p binding sites in the promoter of the chromosomal copy of thePGK gene. Northern blot analysis confirmed that mostPGK promoter activity is mediated through the Rap1p binding site. However, significant effects are also mediated through both the Reb1p and Abf1p sites. In contrast, when the promoter is present on a high-copy-number plasmid, both the Abf1p and Reb1p sites play no role in transcriptional activation. The role of Cpf1p was examined using acfp1 null strain. Cpf1p was found to have little if any, effect on activation of either the chromosomal or plasmid-bornePGK gene.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 121 (1984), S. 99-103 
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Parallel clonal populations grown to small defined sizes were used to quantitate rates of generation of metastatic cells. In murine KHT fibrosarcoma and B16 melanoma lines, metastatic cells are generated at effective rates of 10-5 per cell per generation, or greater. These variant cells are unstable, and are apparently lost at very high rates. It thus appears that metastases could arise from unstable variants, and that rapid rates of change in some phenotypes may be an important feature of malignant progression. We have called such rapid variations dynamic heterogeneity. This may be a useful concept for further investigating aspects of tumor heterogeneity.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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