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Microb Cell. 2019 Mar 15;6(5):257-266. doi: 10.15698/mic2019.05.678.

Mitochondria-Associated Membranes (MAMs) are involved in Bax mitochondrial localization and cytochrome c release.

Microbial cell (Graz, Austria)

Alexandre Légiot, Claire Céré, Thibaud Dupoiron, Mohamed Kaabouni, Nadine Camougrand, Stéphen Manon

Affiliations

  1. Institut de Biochimie et de Génétique Cellulaires, UMR 5095 CNRS & Université de Bordeaux, Campus Carreire, CS61390, 1 Rue Camille Saint-Saëns, 33077 Bordeaux, France.

PMID: 31114795 PMCID: PMC6506693 DOI: 10.15698/mic2019.05.678

Abstract

The distribution of the pro-apoptotic protein Bax in the outer mi-tochondrial membrane (OMM) is a central point of regulation of apoptosis. It is now widely recognized that parts of the endoplasmic reticulum (ER) are closely associated to the OMM, and are actively involved in different signaling processes. We addressed a possible role of these domains, called Mitochon-dria-Associated Membranes (MAMs) in Bax localization and function, by ex-pressing the human protein in a yeast mutant deleted of MDM34, a ERMES (ER-Mitochondria Encounter Structure) component. By affecting MAMs stabil-ity, the deletion of MDM34 altered Bax mitochondrial localization, and de-creased its capacity to release cytochrome c. Furthermore, the deletion of MDM34 decreased the size of an incompletely released, MAMs-associated pool of cytochrome c.

Keywords: Bax; ERMES; Saccharomyces cerevisiae; apoptosis; cytochrome c; density gradients; mitochondria; mitochondria associated membranes

Conflict of interest statement

Conflict of interest: The authors declare no conflict of interest.

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