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Mitophagy is a selective form of autophagy that targets dysfunctional or superfluous mitochondria for degradation. During mitophagy, specific selective autophagy receptors (SARs) mark a portion of mitochondria to recruit the autophagy-related (Atg) machinery and nucleate a phagophore. The phagophore expands and surrounds the mitochondrial cargo, forming an autophagosome. Fission plays a crucial role in separating the targeted portion of mitochondria from the main body to sequester it within the autophagosome. Our recent study, utilizing fission and budding yeasts as model systems, has identified Atg44 as a mitochondrial fission factor that generates mitochondrial fragments suitable for phagophore engulfment. Atg44 resides in the mitochondrial intermembrane space (IMS) and interacts with lipid membranes, with the capacity of mediating membrane fragility and fission. Based on our findings, we propose the term mitofissin to refer to Atg44 and its homologous proteins, which might participate in diverse cellular processes requiring membrane remodeling across various species. Atg: autophagy related; IMM: inner mitochondrial membrane; IMS: intermembrane space; PAS: phagophore assembly site; SAR: selective autophagy receptor

Mitofissin: a novel mitochondrial fission protein that facilitates mitophagy