Molecular mechanism of mitochondrial membrane fusion.
Mitochondrial fusion requires coordinated fusion of the outer and inner membranes. This process leads to exchange of contents, controls the shape of mitochondria, and is important for mitochondrial function. Two types of mitochondrial GTPases are essential for mitochondrial fusion. On the outer membrane, the fuzzy onions/mitofusin proteins form complexes in trans that mediate homotypic physical interactions between adjacent mitochondria and are likely directly involved in outer membrane fusion. Associated with the inner membrane, the OPA1 dynamin-family GTPase maintains membrane structure and is a good candidate for mediating inner membrane fusion. In yeast, Ugo1p binds to both of these GTPases to form a fusion complex, although a related protein has yet to be found in mammals. An understanding of the molecular mechanism of fusion may have implications for Charcot-Marie-Tooth subtype 2A and autosomal dominant optic atrophy, neurodegenerative diseases caused by mutations in Mfn2 and OPA1.
Division of Biology, California Institute of Technology, 1200 East California Blvd., MC114-96, Pasadena, CA 91125, USA.
Erik E
EE
Griffin
Scott A
SA
Detmer
David C
DC
Chan
D000818:Animals; D004875:Ergosterol / Q000378:metabolism; D020558:GTP Phosphohydrolases / Q000378:metabolism; D006801:Humans; D008561:Membrane Fusion; D051336:Mitochondrial Membranes / Q000378:metabolism*; D050600:SNARE Proteins / Q000378:metabolism; D018406:Virus Physiological Phenomena
D050600:SNARE Proteins; D020558:GTP Phosphohydrolases; D004875:Ergosterol