Drp1 Tubulates the ER in a GTPase-Independent Manner.

Mitochondria are highly dynamic organelles that continuously grow, divide, and fuse. The division of mitochondria is crucial for human health. During mitochondrial division, the mechano-guanosine triphosphatase (GTPase) dynamin-related protein (Drp1) severs mitochondria at endoplasmic reticulum (ER)-mitochondria contact sites, where peripheral ER tubules interact with mitochondria. Here, we report that Drp1 directly shapes peripheral ER tubules in human and mouse cells. This ER-shaping activity is independent of GTP hydrolysis and located in a highly conserved peptide of 18 amino acids (termed D-octadecapeptide), which is predicted to form an amphipathic α helix. Synthetic D-octadecapeptide tubulates liposomes in vitro and the ER in cells. ER tubules formed by Drp1 promote mitochondrial division by facilitating ER-mitochondria interactions. Thus, Drp1 functions as a two-in-one protein during mitochondrial division, with ER tubulation and mechano-GTPase activities. Copyright © 2020 Elsevier Inc. All rights reserved.

Citation

Yoshihiro Adachi, Takashi Kato, Tatsuya Yamada, Daisuke Murata, Kenta Arai, Robert V Stahelin, David C Chan, Miho Iijima, Hiromi Sesaki. Drp1 Tubulates the ER in a GTPase-Independent Manner. Molecular cell. 2020 Nov 19;80(4):621-632.e6

Mesh Tags

Substances

PMID: 33152269

search → result