Affiliation:
1. Department of Biochemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská Dolina CH1, Ilkovičova 6, 84215 Bratislava, Slovakia
Abstract
Permeabilization of mitochondrial membrane by proteins of the BCL-2 family is a key decisive event in the induction of apoptosis in mammalian cells. Although yeast does not have homologs of the BCL-2 family, when these are expressed in yeast, they modulate the survival of cells in a way that corresponds to their activity in mammalian cells. The yeast gene, alternatively referred to as BXI1 or YBH3, encodes for membrane protein in the endoplasmic reticulum that was, contradictorily, shown to either inhibit Bax or to be required for Bax activity. We have tested the effect of the deletion of this gene on the pro-apoptotic activity of Bax and Bak and the anti-apoptotic activity of Bcl-XL and Bcl-2, as well on survival after treatment with inducers of regulated cell death in yeast, hydrogen peroxide and acetic acid. While deletion resulted in increased sensitivity to acetic acid, it did not affect the sensitivity to hydrogen peroxide nor to BCL-2 family members. Thus, our results do not support any model in which the activity of BCL-2 family members is directly affected by BXI1 but rather indicate that it may participate in modulating survival in response to some specific forms of stress.
Funder
Scientific Grant Agency of the Ministry of Education of Slovak Republic VEGA
Operation Program of Integrated Infrastructure
Subject
Inorganic Chemistry,Organic Chemistry,Physical and Theoretical Chemistry,Computer Science Applications,Spectroscopy,Molecular Biology,General Medicine,Catalysis
Reference45 articles.
1. The BCL-2 protein family: Opposing activities that mediate cell death;Youle;Nat. Rev. Mol. Cell Biol.,2008
2. Evolution of Bcl-2 homology motifs: Homology versus homoplasy;Aouacheria;Trends Cell Biol.,2013
3. Many players in BCL-2 family affairs;Moldoveanu;Trends Biochem. Sci.,2014
4. Czabotar, P.E., and Garcia-Saez, A.J. (2023). Mechanisms of BCL-2 family proteins in mitochondrial apoptosis. Nat. Rev. Mol. Cell Biol., 1–17.
5. Apoptosis in yeast: Triggers, pathways, subroutines;Eisenberg;Cell Death Differ.,2010