8sz4

Cryo-EM of the GDP-bound human dynamin polymer assembled on the membrane in the super constricted state showing the PH domain

spinqualitylabelsall models 8sz4, resolution 2.86Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 8sz4 is a 1 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 2.86Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function DYN1_HUMAN Microtubule-associated force-producing protein involved in producing microtubule bundles and able to bind and hydrolyze GTP. Most probably involved in vesicular trafficking processes. Involved in receptor-mediated endocytosis. Publication Abstract from PubMed Dynamin assembles as a helical polymer at the neck of budding endocytic vesicles, constricting the underlying membrane as it progresses through the GTPase cycle to sever vesicles from the plasma membrane. Although atomic models of the dynamin helical polymer bound to guanosine triphosphate (GTP) analogs define earlier stages of membrane constriction, there are no atomic models of the assembled state post-GTP hydrolysis. Here, we used cryo-EM methods to determine atomic structures of the dynamin helical polymer assembled on lipid tubules, akin to necks of budding endocytic vesicles, in a guanosine diphosphate (GDP)-bound, super-constricted state. In this state, dynamin is assembled as a 2-start helix with an inner lumen of 3.4 nm, primed for spontaneous fission. Additionally, by cryo-electron tomography, we trapped dynamin helical assemblies within HeLa cells using the GTPase-defective dynamin K44A mutant and observed diverse dynamin helices, demonstrating that dynamin can accommodate a range of assembled complexes in cells that likely precede membrane fission. Cryo-EM structures of membrane-bound dynamin in a post-hydrolysis state primed for membrane fission.,Jimah JR, Kundu N, Stanton AE, Sochacki KA, Canagarajah B, Chan L, Strub MP, Wang H, Taraska JW, Hinshaw JE Dev Cell. 2024 Apr 23:S1534-5807(24)00233-8. doi: 10.1016/j.devcel.2024.04.008. PMID:38663399 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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