Dynamin-like GTPase MGM1, mitochondrial

UniProtKB accession:  P32266

Grouped By:  Matching UniProtKB accession

UniProtKB description:  Dynamin-related GTPase that is essential for normal mitochondrial morphology by mediating fusion of the mitochondrial inner membranes, regulating cristae morphology and maintaining respiratory chain function (PubMed:10037792, PubMed:12566426, PubMed:12707284, PubMed:15087460, PubMed:15297626, PubMed:17055438, PubMed:19236101, PubMed:19752025, PubMed:32041880). Exists in two forms: the transmembrane, long form (Dynamin-like GTPase MGM1, long form; L-MGM1), which is tethered to the inner mitochondrial membrane, and the short soluble form (Dynamin-like GTPase MGM1, short form; S-MGM1), which results from proteolytic cleavage and localizes in the intermembrane space (PubMed:12707284, PubMed:15096522, PubMed:19752025). Both forms (L-MGM1 and S-MGM1) cooperate to catalyze the fusion of the mitochondrial inner membrane (PubMed:12707284, PubMed:15096522, PubMed:17055438). The equilibrium between L-MGM1 and S-MGM1 is essential: excess levels of S-MGM1, following loss of mitochondrial membrane potential, lead to an impaired equilibrium between L-MGM1 and S-MGM1, inhibiting mitochondrial fusion (By similarity). Plays a role in the maintenance and remodeling of mitochondrial cristae, some invaginations of the mitochondrial inner membrane that provide an increase in the surface area (PubMed:31292547). Probably acts by forming helical filaments at the inside of inner membrane tubes with the shape and dimensions of crista junctions (PubMed:31292547).