This entry represents the C-terminal domain of Dynamin-like GTPase OPA1. This protein is involved in mitochondrial fusion and inner membrane remodelling, essential for normal mitochondrial morphology by regulating the equilibrium between mitochondrial fusion and mitochondrial fission [1,2,3]. Mutations in human OPA1 cause optic atrophy [3]. This domain includes the helix bundle (HB) domains HB1 (C-terminal) and HB2 (equivalent to extreme C-terminal bundle signaling element (BSE) and to the stalk domain of dynamin-1, respectively) and the lipid-interacting stalk (LIS, equivalent to the PH domain of dynamin-1) [3].

1: Regulation of mitochondrial morphology through proteolytic cleavage of OPA1. Ishihara N, Fujita Y, Oka T, Mihara K; EMBO J. 2006;25:2966-2977. PMID:16778770

2: Primary structure of a dynamin-related mouse mitochondrial GTPase and its distribution in brain, subcellular localization, and effect on mitochondrial morphology. Misaka T, Miyashita T, Kubo Y; J Biol Chem. 2002;277:15834-15842. PMID:11847212

3: Structural insights into G domain dimerization and pathogenic mutation of OPA1. Yu C, Zhao J, Yan L, Qi Y, Guo X, Lou Z, Hu J, Rao Z; J Cell Biol. 2020; [Epub ahead of print] PMID:32379273