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A two-component system that regulates an osmosensing MAP kinase cascade in yeast
T Maeda1, S M Wurgler-Murphy, H Saito
1Division of Tumor Immunology, Dana-Farber Cancer Institute, Boston, Massachusetts.
Nature
|May 19, 1994
Summary
This study identifies a novel two-component system in yeast that regulates osmosensing. This system involves signal transduction, similar to prokaryotes, controlling a key cellular pathway.
Area of Science:
- Cellular Biology
- Molecular Biology
- Biochemistry
Background:
- Prokaryotic two-component systems mediate environmental signal transduction via histidine kinase and response regulator domains.
- Eukaryotic homologs of these domains exist, but their functional integration into two-component systems remained unclear.
Purpose of the Study:
- To investigate the presence and function of a two-component system in Saccharomyces cerevisiae.
- To elucidate the role of this system in regulating cellular responses to osmotic stress.
Main Methods:
- Analysis of protein sequences for homology to prokaryotic two-component system elements.
- Functional studies in Saccharomyces cerevisiae to assess signal transduction pathways.
Main Results:
- Identification of a functional two-component system in Saccharomyces cerevisiae.
- Demonstration that this system regulates an osmosensing mitogen-activated protein (MAP) kinase cascade.
Conclusions:
- Saccharomyces cerevisiae possesses a two-component system that controls osmotic stress response.
- This finding expands the known occurrence of two-component systems beyond prokaryotes into eukaryotes.