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Digitale Medien

Identification of UAS elements and binding proteins necessary for derepression of Saccharomyces cerevisiae fructose-1,6-bisphosphatase (1992)

Niederacher, D. ; Schüller, H. -J. ; Grzesitza, D. ; [weitere]

Springer

Current genetics 22 (1992), S. 363-370

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ISSN: 1432-0983

Schlagwort(e): Saccharomyces cerevisiae ; Fructose-1,6-bisphosphatase ; Glucose repression ; Gene activation ; Gluconeogenesis

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Summary Fructose-1,6-bisphosphatase is a key enzyme in gluconeogenesis and the FBP1 gene is not transcribed during growth with glucose. Genetic analysis indicated a positive regulation of FBP1 expression after exhaustion of glucose. By linker-deletion analysis, two upstream activation sites (UAS1 and UAS2) were localized and the respective UAS-binding factors (DAP I and DAP II for derepression activating protein) were identified by gel retardation. UAS1 and UAS2 span about 30 bp each, and are separated by approximately 30 bp. Both UAS sites act synergistically. Although UAS1 showed some similarities to the DNA-binding consensus for the general yeast activator Rap1, competition experiments and DEAE-chromatography proved that DAP I and Rap1 correspond to different proteins. Gel retardation by DAP I depended on carbon sources and did not occur in cells growing logarithmically with glucose, whereas a strong retardation signal was obtained with ethanol-grown cells. The present results suggest that DAP I and DAP II are the final regulatory elements for glucose derepression.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00352437

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Digitale Medien

Determination of the antidepressant levoprotiline and its N-desmethyl metabolite in biological fluids by gas chromatography/mass spectrometry (1991)

Ackermann, R. ; Kaiser, G. ; Schueller, F. ; [weitere]

Chichester : Wiley-Blackwell

Biological Mass Spectrometry 20 (1991), S. 709-716

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ISSN: 1052-9306

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: A specific and sensitive gas chromatographic/mass spectrometric method was developed and validated for the determination of the antidepressant levoprotiline in blood, plasma and urine and the simultaneous determination of levoprotiline and its desmethyl metabolite in urine. Deuterium-labelled analogues were used as internal standards. The compounds were isolated from the biological fluids by liquid-liquid extraction under basic conditions. Following derivatization with perfluoropropionic anhydride, the samples were analysed by capillary column gas chroma-tography/electron impact mass spectrometry with selected ion monitoring. The analysis of spiked samples demonstrated the high accuracy and precision of the method. Blood concentrations of levoprotiline down to 0.7 nmol I-1 (1 ml used for analysis) could be quantified with a coefficient of variation of 10% or less. The method is suitable for use in pharmacokinetic and bioavailability studies of levoprotiline in humans.

Zusätzliches Material: 6 Ill.