Regulation of maltase synthesis in Saccharomyces carlsbergensis
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Summary
This summary is machine-generated.Yeast maltase (EC 3.2.1.20) production is transcriptionally controlled by maltose. Maltase messenger RNA (mRNA) levels rise during induction and fall when the enzyme accumulates, regulating synthesis.
Area Of Science
- Molecular Biology
- Yeast Genetics
- Enzymology
Background
- Maltase (EC 3.2.1.20) is an enzyme crucial for carbohydrate metabolism in yeast.
- Its production in Saccharomyces carlsbergensis is induced by maltose.
- Regulation of enzyme synthesis occurs at the transcriptional level.
Purpose Of The Study
- To investigate the transcriptional regulation of maltase induction in Saccharomyces carlsbergensis.
- To determine the role of maltase mRNA levels in enzyme synthesis during induction.
Main Methods
- DNA-RNA hybridizations using a maltase structural gene DNA probe to quantify maltase mRNA.
- In vitro RNA-directed synthesis to assay functional maltase mRNA.
- Enzyme activity assays to measure maltase levels.
Main Results
- Maltose induction of maltase involves de novo synthesis of maltase-specific RNA sequences.
- Increased maltase mRNA levels precede elevated maltase enzyme accumulation.
- Late in induction, maltase synthesis is inhibited, correlating with reduced maltase mRNA levels.
Conclusions
- Maltase induction in Saccharomyces carlsbergensis is primarily regulated at the transcriptional level.
- Maltase mRNA levels directly reflect the rate of enzyme synthesis.
- A feedback mechanism likely downregulates maltase transcription once sufficient enzyme has accumulated.