Role of mitochondria and C-terminal membrane anchor of Bcl-2 in Bax induced growth arrest and mortality in Saccharomyces cerevisiae.

Abstract:

:In mammalian cells, the Bcl-2 and Bcl-x(L) proteins suppress programmed cell death whereas the topographically similar Bax protein accelerates the apoptotic process. Recently published data suggest that expression of the human Bax-alpha gene is lethal for the yeast Saccharomyces cerevisiae and that this toxicity can be overcome by co-expressing Bcl-2 or Bcl-x(L). Our findings corroborate these results. However, we find that although Bax induction invariably stops cell growth under all circumstances, it does not lead to death in 'petite' cells. Petites cannot respire because they lack functional mitochondria. It seems that in 'grande' cells, which do possess normal mitochondrial DNA, nutritional limitation is critical for increased mortality. Surprisingly, murine Bcl-2 lacking the membrane anchor of human Bcl-2 has no effect on grande cells, but can efficiently rescue petites in rich medium. It has been suggested that the C-terminal membrane anchor of human Bcl-2 may have a crucial role in rescuing apoptosis in mammalian cells. When murine Bcl-2 is fused to the membrane anchor of yeast mitochondrial Mas70 protein, the Bcl-2 variant mBcl-2-mma rescues not only petites but also grandes, just like human Bcl-x(L). The rescuing ability of Bcl-x(L), which contains its own membrane anchor, surpasses that of mBcl-2-mma. Our results indicate that the process involving Bax-induced growth inhibition followed by possible lethality, and the rescuing effect of Bcl-2 and Bcl-x(L) is linked to yeast mitochondrial function. We propose a model which is consistent with these observations.

journal_name

FEBS Lett

journal_title

FEBS letters

authors

Greenhalf W,Stephan C,Chaudhuri B

doi

10.1016/0014-5793(96)00044-0

subject

Has Abstract

pub_date

1996-02-12 00:00:00

pages

169-75

issue

1-2

eissn

0014-5793

issn

1873-3468

pii

0014-5793(96)00044-0

journal_volume

380

pub_type

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