ジャーナル: J Cell Biol / 年: 2009 タイトル: Coassembly of Mgm1 isoforms requires cardiolipin and mediates mitochondrial inner membrane fusion. 著者: Rachel M DeVay / Lenin Dominguez-Ramirez / Laura L Lackner / Suzanne Hoppins / Henning Stahlberg / Jodi Nunnari / 要旨: 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. ...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.
名称: Small isoform of yeast Mgm1 / タイプ: sample / ID: 1000 詳細: The sample aggregates as the oligomer observed by electron microscopy only in the presence of lipids, particularly those making up the inner mitochondrial membrane. 集合状態: trimer of dimers / Number unique components: 1
分子量
実験値: 76 MDa / 理論値: 76 MDa / 手法: Sedimentation
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分子 #1: Mitochondrial genome maintenance 1
分子
名称: Mitochondrial genome maintenance 1 / タイプ: protein_or_peptide / ID: 1 / Name.synonym: Dynamin-like GTPase MGM1, mitochondrial 詳細: Lipid monolayer with same composition as inner mitochondrial membranes コピー数: 6 / 集合状態: Trimer of dimers / 組換発現: Yes