Kinetics of mRNA and protein synthesis of genes controlled by the 1,4-beta-endoxylanase A promoter in controlled fermentations of Aspergillus awamori
| Autor: | A.J. Fellinger, R. J. Gouka, Wouter Musters, P.J. Punt, C.A.M.J.J. van den Hondel, Hein Stam, A.J. van de Wijngaard, R.J.G.T. Muijsenberg |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Recombinant Fusion Proteins
medicine.disease_cause Applied Microbiology and Biotechnology Gene Expression Regulation Fungal Gene expression medicine Protein biosynthesis RNA Messenger Lipase Promoter Regions Genetic Escherichia coli Aspergillus awamori Glucuronidase Messenger RNA Endo-1 4-beta Xylanases Xylose Ecology biology Promoter Molecular biology Kinetics Aspergillus Glucose Xylosidases Biochemistry Cell culture Protein Biosynthesis Fermentation biology.protein Research Article Food Science Biotechnology |
| Zdroj: | Applied and Environmental Microbiology. 62:3646-3649 |
| ISSN: | 1098-5336 0099-2240 |
| Popis: | In this study, induction and repression kinetics of the expression of the Aspergillus awamori 1,4-beta-endoxylanase A (exlA) gene under defined physiological conditions was analyzed at the mRNA and the protein levels. Induction was analyzed by pulsing D-xylose to a sucrose-limited continuous culture of an A. awamori 1,4-beta-endoxylanase A (EXLA)-overproducing strain. Directly after the D-xylose pulse, exIA mRNA was synthesized, and it reached a constant maximal level after 45 to 60 min. This level was maintained as long as D-xylose was present. The kinetics of mRNA synthesis of the genes encoding Thermomyces lanuginosa lipase (lplA) and Escherichia coli beta-glucuronidase (uidA), which were also under the control of the exlA promoter, were similar to those observed for exlA mRNA. The repression of exlA expression was analyzed by pulsing D-glucose to a D-xylose-limited continuous culture. Immediately after the glucose pulse, the exlA mRNA level declined rapidly, with a half-life of approximately 20 to 30 min, and it reached a minimal level after 60 to 90 min. The time span between mRNA synthesis and the secretion of proteins was determined for EXLA and lipase. In both cases, mRNA became visible after approximately 7.5 min. After 1 h, both proteins became detectable in the medium but the rate of secretion of EXLA was faster than that of lipase. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|