Dynamin-like 120 kDa protein, mitochondrial (OPA1)

Dynamin-related GTPase that's essential for normal mitochondrial morphology by regulating the balance between mitochondrial fusion and mitochondrial fission (PubMed:16778770, PubMed:17709429, PubMed:20185555, PubMed:24616225, PubMed:28746876). Coexpression of isoform 1 with shorter alternative products is necessary for optimal activity in promoting mitochondrial fusion (PubMed:17709429).

Binds lipid membranes enriched in negatively charged phospholipids, such as cardiolipin, and promotes membrane tubulation (PubMed:20185555). The intrinsic GTPase activity is reduced, and is strongly increased by interaction with lipid membranes (PubMed:20185555).