4UUD image
Entry Detail
PDB ID:
4UUD
Title:
Human dynamin 1 K44A superconstricted polymer stabilized with GTP
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2014-07-25
Release Date:
2014-08-27
Method Details:
Experimental Method:
Resolution:
12.50 Å
Aggregation State:
FILAMENT
Reconstruction Method:
HELICAL
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:DYNAMIN-1
Chain IDs:A, D, G, K
Chain Length:864
Number of Molecules:4
Biological Source:HOMO SAPIENS
Polymer Type:polypeptide(L)
Description:DYNAMIN-1
Chain IDs:B, C, E, F, H, I, J, L
Chain Length:864
Number of Molecules:8
Biological Source:HOMO SAPIENS
Ligand Molecules
Primary Citation
A Dynamin Mutant Defines a Superconstricted Prefission State.
Cell Rep. 8 734 ? (2014)
PMID: 25088425 DOI: 10.1016/J.CELREP.2014.06.054

Abstact

Dynamin is a 100 kDa GTPase that organizes into helical assemblies at the base of nascent clathrin-coated vesicles. Formation of these oligomers stimulates the intrinsic GTPase activity of dynamin, which is necessary for efficient membrane fission during endocytosis. Recent evidence suggests that the transition state of dynamin's GTP hydrolysis reaction serves as a key determinant of productive fission. Here, we present the structure of a transition-state-defective dynamin mutant K44A trapped in a prefission state at 12.5 Å resolution. This structure constricts to 3.7 nm, reaching the theoretical limit required for spontaneous membrane fission. Computational docking indicates that the ground-state conformation of the dynamin polymer is sufficient to achieve this superconstricted prefission state and reveals how a two-start helical symmetry promotes the most efficient packing of dynamin tetramers around the membrane neck. These data suggest a model for the assembly and regulation of the minimal dynamin fission machine.

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