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Bcl-2 and porin follow different pathways of TOM-dependent insertion into the mitochondrial outer membrane.

Abstract：

:The bcl-2 gene encodes a 26kDa protein which functions as a central regulator of apoptosis. Here we investigated the pathway of Bcl-2alpha into the mitochondrial outer membrane using the yeast Saccharomyces cerevisiae as a model organism. We found that interactions of Bcl-2alpha with the mitochondrial import receptor Tom20 are dependent on two positively charged lysine residues in the immediate vicinity of the carboxy-terminal hydrophobic membrane anchor. The targeting function of these residues is independent of Tom22. Subsequent insertion of Bcl-2alpha into the mitochondrial outer membrane does not require Tom5 or Tom40, indicating that Bcl-2alpha bypasses the general import pore (GIP). Bcl-2alpha shows a unique pattern of interactions with the components of the mitochondrial TOM complex, demonstrating that at least two different pathways lead from the import receptor Tom20 into the mitochondrial outer membrane.

journal_name

J Mol Biol

journal_title

Journal of molecular biology

authors

Motz C,Martin H,Krimmer T,Rassow J

doi

10.1016/s0022-2836(02)00995-6

keywords:

subject

Has Abstract

pub_date

2002-11-01 00:00:00

pages

729-38

issue

4

eissn

0022-2836

issn

1089-8638

pii

S0022283602009956

journal_volume

323

pub_type

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