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A cDNA encoding the human transforming growth factor beta receptor suppresses the growth defect of a yeast mutant
1Department of Biochemical Engineering and Science, Faculty of Computer Science and Systems Engineering, Kyushu Institute of Technology, Fukuoka, Japan.
Abstract:
Transforming growth factor beta (TGF-beta) is a multifunctional factor that regulates many aspects of cellular processes. TGF-beta signals through a heteromeric complex of type-I and type-II receptors, which both belong to the transmembrane (TM) receptor serine/threonine kinase family. Reported here is the isolation of a subtype of the human TGF-beta receptor type II from a cDNA library using a Saccharomyces cerevisiae mutant. This yeast mutant has a defect in the expression of the gene encoding inositol-1-phosphate synthase and requires myo-inositol for its growth. The cloned subtype of the TGF-beta receptor type II has a 25-amino-acid insertion relative to the reported receptor type-II sequence. In addition to that encoding the TGF-beta receptor, two more human genes were obtained using the same yeast mutant. They encode the protein phosphatase type 2A regulatory subunit A and a 14-3-3 protein which is known as a regulatory protein for protein kinases. These results clearly indicate that these human genes function in yeast cells. It is also suggested that yeast possesses a signal transduction mechanism resembling the human TGF-beta-mediated signaling pathway.
Insights
Researchers isolated a human TGF-beta receptor type II subtype using a yeast mutant. This discovery suggests yeast may share similar signaling pathways with humans, impacting cellular processes.
Area of Science:
- Molecular Biology
- Cellular Signaling
- Yeast Genetics
Background:
- Transforming growth factor beta (TGF-beta) is crucial for cellular processes, signaling via transmembrane receptor serine/threonine kinases.
- Understanding TGF-beta receptor function is key to deciphering complex cellular regulation.
Purpose of the Study:
- To isolate and characterize a human TGF-beta receptor type II subtype.
- To investigate the functional expression of human genes in yeast.
- To explore potential similarities between yeast and human signaling pathways.
Main Methods:
- Utilized a Saccharomyces cerevisiae mutant defective in inositol-1-phosphate synthase for cDNA library screening.
- Isolated a human TGF-beta receptor type II subtype with a unique 25-amino-acid insertion.
- Identified two additional human genes (protein phosphatase 2A regulatory subunit A and a 14-3-3 protein) using the same yeast system.
Main Results:
- Successfully isolated a novel human TGF-beta receptor type II subtype.
- Demonstrated functional expression of human genes, including the TGF-beta receptor subtype, in yeast cells.
- Identified two other human genes, protein phosphatase 2A regulatory subunit A and a 14-3-3 protein, that function in yeast.
Conclusions:
- Human genes can be functionally expressed in yeast, validating the use of yeast as a model system.
- The findings suggest that yeast may possess conserved signal transduction mechanisms similar to the human TGF-beta pathway.
- This research opens avenues for studying human signaling pathways using yeast genetics.