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Yeast as a tool for studying proteins of the Bcl-2 family
Peter Polčic1, Petra Jaká1, Marek Mentel1
1Department of Biochemistry, Faculty of Natural Sciences, Comenius University, Bratislava, Slovak Republic.
Abstract:
Permeabilization of the outer mitochondrial membrane that leads to the release of cytochrome c and several other apoptogenic proteins from mitochondria into cytosol represents a commitment point of apoptotic pathway in mammalian cells. This crucial event is governed by proteins of the Bcl-2 family. Molecular mechanisms, by which Bcl-2 family proteins permeabilize mitochondrial membrane, remain under dispute. Although yeast does not have apparent homologues of these proteins, when mammalian members of Bcl-2 family are expressed in yeast, they retain their activity, making yeast an attractive model system, in which to study their action. This review focuses on using yeast expressing mammalian proteins of the Bcl-2 family as a tool to investigate mechanisms, by which these proteins permeabilize mitochondrial membranes, mechanisms, by which pro- and antiapoptotic members of this family interact, and involvement of other cellular components in the regulation of programmed cell death by Bcl-2 family proteins.
Insights
Yeast expressing mammalian Bcl-2 family proteins offers a model to study programmed cell death. This system investigates how these proteins permeabilize mitochondrial membranes and regulate apoptosis.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Apoptosis, or programmed cell death, is critical in mammalian cells.
- Outer mitochondrial membrane permeabilization releases apoptotic factors, a key event regulated by Bcl-2 family proteins.
- Mechanisms of Bcl-2 protein-mediated mitochondrial permeabilization are not fully understood.
Purpose of the Study:
- To review the use of yeast as a model system for studying mammalian Bcl-2 family proteins.
- To explore how Bcl-2 family proteins permeabilize mitochondrial membranes.
- To investigate the interactions between pro- and antiapoptotic Bcl-2 members and their role in programmed cell death regulation.
Main Methods:
- Expression of mammalian Bcl-2 family proteins in yeast.
- Utilizing yeast as a model organism to study mitochondrial outer membrane permeabilization.
- Analyzing protein interactions and cellular component involvement in apoptosis regulation.
Main Results:
- Mammalian Bcl-2 family proteins retain apoptotic function when expressed in yeast.
- Yeast provides a tractable system to dissect the molecular mechanisms of Bcl-2 protein action.
- The study highlights the conserved nature of apoptosis regulation.
Conclusions:
- Yeast expressing mammalian Bcl-2 proteins is a valuable tool for understanding apoptosis.
- Further research in yeast can elucidate the precise mechanisms of mitochondrial permeabilization.
- This model aids in understanding the complex regulation of programmed cell death by Bcl-2 family proteins.