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Copper and gene regulation in yeast
1Department of Biological Chemistry, University of Michigan Medical School, Ann Arbor 48109-0606.
Biofactors (Oxford, England)
|May 1, 1993
Summary
Yeast copper detoxification relies on metallothioneins (MTs) and metalloregulatory transcription factors (MRTFs). Copper binding activates MRTFs, enabling them to induce genes essential for managing cellular copper levels.
Area of Science:
- Molecular Biology
- Biochemistry
- Yeast Genetics
Background:
- Copper is an essential trace element but toxic at high intracellular concentrations.
- Yeast (Saccharomyces cerevisiae, Candida glabrata) utilize metallothioneins (MTs) for copper detoxification.
- Copper homeostasis is regulated by metalloregulatory transcription factors (MRTFs).
Purpose of the Study:
- To elucidate the mechanism of copper-induced gene transcription in yeast.
- To investigate the role of MRTFs in copper detoxification and homeostasis.
- To understand how copper signals are transduced to regulate gene expression.
Main Methods:
- Analysis of gene regulation in response to copper.
- Identification and characterization of MRTFs (ACE1, AMT1).
- Study of protein-DNA interactions between MRTFs and target gene promoters.
Main Results:
- Elevated copper induces the transcription of MTs and other copper-homeostasis proteins via MRTFs.
- Copper coordination induces a conformational change in MRTFs, activating DNA-binding function.
- Specific MRTFs (ACE1, AMT1) bind to copper-responsive elements in target gene promoters.
Conclusions:
- Copper-regulated gene expression in yeast is mediated by MRTFs.
- The binding of copper to MRTFs acts as a rapid signal transduction mechanism.
- This process ensures efficient copper detoxification and maintains cellular copper balance.