Coassembly of Mgm1 isoforms requires cardiolipin and mediates mitochondrial inner membrane fusion

DeVay, Rachel M. and Dominguez-Ramirez, Lenin and Lackner, Laura L. and Hoppins, Suzanne and Stahlberg, Henning and Nunnari, Jodi. (2009) Coassembly of Mgm1 isoforms requires cardiolipin and mediates mitochondrial inner membrane fusion. The Journal of cell biology, Vol. 186, H. 6. pp. 793-803.

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Official URL: http://edoc.unibas.ch/dok/A5262360

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Two dynamin-related protein (DRP) families are essential for fusion of the outer and inner mitochondrial membranes, Fzo1 (yeast)/Mfn1/Mfn2 (mammals) and Mgm1 (yeast)/Opa1 (mammals), respectively. Fzo1/Mfns possess two medial transmembrane domains, which place their critical GTPase and coiled-coil domains in the cytosol. In contrast, Mgm1/Opa1 are present in cells as long (l) isoforms that are anchored via the N terminus to the inner membrane, and short (s) isoforms were predicted to be soluble in the intermembrane space. We addressed the roles of Mgm1 isoforms and how DRPs function in membrane fusion. Our analysis indicates that in the absence of a membrane, l- and s-Mgm1 both exist as inactive GTPase monomers, but that together in trans they form a functional dimer in a cardiolipin-dependent manner that is the building block for higher-order assemblies.
Faculties and Departments:05 Faculty of Science > Departement Biozentrum > Former Organization Units Biozentrum > Structural Biology (Stahlberg)
UniBasel Contributors:Stahlberg, Henning
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Rockefeller University Press
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:31 Dec 2015 10:49
Deposited On:08 Jun 2012 06:48

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