Localisation de l'ATP synthase mitochondriale et remaniement du réseau mitochondrial en quiescence

Abstract : Mitochondria form a dynamic tubular network which organization and distribution is highly regulated.Mitochondria are double membrane organites with a complex internal architecture. Cristae, which areinner membrane invaginations, are the site of oxidative phosphorylation, reactions by which ATP synthaseproduces ATP. ATP synthase also play a key role in cristae morphogenesis. In this study, I have shown thatATP synthase localized as discrete clusters along the mitochondrial network in living S. cerevisiae cellsgrown on a fermentable carbon source. Overall our data suggest that ATP synthase clusers correspond tomitochondrial cristae, opening new avenues to explore the mechanisms involved in inner membraneremodelling.Mitochondrial network morphology is regulated by a dynamic equilibrium between the fusion and fissionof mitochondrial tubules. In the second part of my thesis, I highlight a progressive mitochondrialfragmentation during quiescence establishment, a state defined as a reversible absence of proliferation.Quiescent cells mitochondrial network is composed of immobile small cortical mitochondrial vesicles witha variable enzymatic content. Upon quiescence exit, cortical mitochondrial vesicles rapidly fuse and atubular network is reconstituted prior to bud emergence. Astonishingly, neither the canonical fusion orfission machineries nor the actin cytoskeleton are required for the mitochondrial network modificationduring quiescence / proliferation transition.
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Laure Jimenez. Localisation de l'ATP synthase mitochondriale et remaniement du réseau mitochondrial en quiescence. Biologie cellulaire. Université de Bordeaux, 2014. Français. ⟨NNT : 2014BORD0194⟩. ⟨tel-01359182⟩



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