Actin filaments target the oligomeric maturation of the dynamin GTPase Drp1 to mitochondrial fission sites
- Geisel School of Medicine at Dartmouth, United States
- The University of Iowa, United States
Abstract
While the dynamin GTPase Drp1 plays a critical role during mitochondrial fission, mechanisms controlling its recruitment to fission sites are unclear. A current assumption is that cytosolic Drp1 is recruited directly to fission sites immediately prior to fission. Using live-cell microscopy, we find evidence for a different model, progressive maturation of Drp1 oligomers on mitochondria through incorporation of smaller mitochondrially-bound Drp1 units. Maturation of a stable Drp1 oligomer does not forcibly lead to fission. Inhibiting actin polymerization, myosin IIA, or the formin INF2 reduces both un-stimulated and ionomycin-induced Drp1 accumulation and mitochondrial fission. Actin filaments bind purified Drp1 and increase GTPase activity in a manner that is synergistic with the mitochondrial protein Mff, suggesting a role for direct Drp1/actin interaction. We propose that Drp1 is in dynamic equilibrium on mitochondria in a fission-independent manner, and that fission factors such as actin filaments target productive oligomerization to fission sites.
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© 2015, Ji et al.
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Actin filaments target the oligomeric maturation of the dynamin GTPase Drp1 to mitochondrial fission sites
eLife 4:e11553.
https://doi.org/10.7554/eLife.11553
