A brain-enriched Drp1 isoform associates with lysosomes, late endosomes, and the plasma membrane

作者：Itoh Kie; Adachi Yoshihiro; Yamada Tatsuya; Suzuki Takamichi L; Otomo Takanobu; McBride Heidi M; Yoshimori Tamotsu; Iijima Miho; Sesaki Hiromi^*

来源：JOURNAL OF BIOLOGICAL CHEMISTRY, 2018, 293(30): 11809-11822.

DOI：10.1074/jbc.RA117.001253

Dynamin-related protein 1 (Drp1) constricts mitochondria as a mechanochemical GTPase during mitochondrial division. The Drp1 gene contains several alternative exons and produces multiple isoforms through RNA splicing. Here we performed a systematic analysis of Drp1 transcripts in different mouse tissues and identified a previously uncharacterized isoform that is highly enriched in the brain. This Drp1 isoform is termed Drp1(ABCD) because it contains four alterative exons: A, B, C, and D. Remarkably, Drp1(ABCD) is located at lysosomes, late endosomes, and the plasma membrane in addition to mitochondria. Furthermore, Drp1(ABCD) is concentrated at the interorganelle interface between mitochondria and lysosomes/late endosomes. The localizations of Drp1(ABCD) at lysosomes, late endosomes, and the plasma membrane require two exons, A and B, that are present in the GTPase domain. Drp1(ABCD) assembles onto these membranes in a manner that is regulated by its oligomerization and GTP hydrolysis. Experiments using lysosomal inhibitors show that the association of Drp1(ABCD) with lysosomes/late endosomes depends on lysosomal pH but not their protease activities. Thus, Drp1 may connect mitochondria to endosomal-lysosomal pathways in addition to mitochondrial division.

• 出版日期2018-7-27
• 单位McGill