National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01 GM125844
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01 GM108753
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01 GM143805
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
F31 GM139324
米国
引用
ジャーナル: J Mol Biol / 年: 2025 タイトル: The Structure of the Drp1 Lattice on Membrane. 著者: Ruizhi Peng / Kristy Rochon / Anelise N Hutson / Scott M Stagg / Jason A Mears / 要旨: Mitochondrial health relies on the membrane fission mediated by dynamin-related protein 1 (Drp1). Previous structural studies of Drp1 on remodeled membranes were hampered by heterogeneity, leaving a ...Mitochondrial health relies on the membrane fission mediated by dynamin-related protein 1 (Drp1). Previous structural studies of Drp1 on remodeled membranes were hampered by heterogeneity, leaving a critical gap in the understanding of the mitochondrial fission mechanisms. Here we present a cryo-electron microscopy structure of full-length human Drp1 decorated on membrane tubules. Using the reconstruction of average subtracted tubular regions (RASTR) technique, we report that Drp1 forms a locally ordered lattice along the tubule without global helical symmetry. The filaments in the lattice are similar to dynamin rungs with conserved stalk interactions. Adjacent filaments are connected by GTPase domain interactions in a novel stacked conformation. We identified two states of the Drp1 lattice among the heterogenous dataset representing conformational changes around hinge 1. Additionally, we observed contact between Drp1 and membrane that can be assigned to the variable domain sequence. Together these structures revealed a putative mechanism by which Drp1 constricts mitochondria membranes in a stepwise, "ratchet" manner.
詳細: Primary Buffer: 25 mM HEPES (KOH) pH 7.5, 0.15 M KCl, 5 mM MgCl2, 10 mM Beta-mercaptoethanol Nanotubes: 40% D-galactosyl-beta-1-N-nervonyl-erythro-sphingosine (GC), 35% ...詳細: Primary Buffer: 25 mM HEPES (KOH) pH 7.5, 0.15 M KCl, 5 mM MgCl2, 10 mM Beta-mercaptoethanol Nanotubes: 40% D-galactosyl-beta-1-N-nervonyl-erythro-sphingosine (GC), 35% phosphatidylethanolamine (PE), 25% phosphatidic acid (PA) Final Sample: Protein diluted to 0.4mg/ml and incubated with 500 uM NTs, 2mM GMPPCP and 2mM MgCl2