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Updated: Jan 30, 2026
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Published on: January 4, 2017
Recent insights into the structure and function of Mitofusins in mitochondrial fusion
Mickael M Cohen1, David Tareste2,3
1Sorbonne Université, CNRS UMR8226, Institut de Biologie Physico-Chimique, Laboratoire de Biologie Moléculaire et Cellulaire des Eucaryotes, Paris, France.
Abstract:
Mitochondria undergo frequent fusion and fission events to adapt their morphology to cellular needs. Homotypic docking and fusion of outer mitochondrial membranes are controlled by Mitofusins, a set of large membrane-anchored GTPase proteins belonging to the dynamin superfamily. Mitofusins include, in addition to their GTPase and transmembrane domains, two heptad repeat domains, HR1 and HR2. All four regions are crucial for Mitofusin function, but their precise contribution to mitochondrial docking and fusion events has remained elusive until very recently. In this commentary, we first give an overview of the established strategies employed by various protein machineries distinct from Mitofusins to mediate membrane fusion. We then present recent structure-function data on Mitofusins that provide important novel insights into their mode of action in mitochondrial fusion.
Insights
Mitochondria use Mitofusins, GTPase proteins, for outer membrane fusion. Recent structure-function data reveals novel insights into how these proteins mediate mitochondrial fusion and docking.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Mitochondria dynamically alter their shape through fusion and fission.
- Outer mitochondrial membrane fusion is regulated by Mitofusins, dynamin superfamily GTPases.
- Mitofusins possess GTPase, transmembrane, HR1, and HR2 domains, all vital for function.
Purpose of the Study:
- To review established membrane fusion strategies.
- To present recent structure-function data on Mitofusins.
- To elucidate Mitofusins' mechanism in mitochondrial fusion.
Main Methods:
- Literature review of protein machineries for membrane fusion.
- Analysis of recent structure-function studies on Mitofusins.
Main Results:
- Mitofusins' distinct domains (GTPase, transmembrane, HR1, HR2) are critical for their function.
- Novel structure-function data provides insights into Mitofusins' role in mitochondrial fusion.
Conclusions:
- Mitofusins are key regulators of mitochondrial outer membrane fusion.
- Recent structural insights are advancing the understanding of Mitofusin-mediated mitochondrial dynamics.
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