4UUK

Human dynamin 1 K44A superconstricted polymer stabilized with GTP strand 2

Summary for 4UUK

• Entry DOI: 10.2210/pdb4uuk/pdb
• Related: 4UUD
• EMDB information: 2701
• Descriptor: DYNAMIN-1 (2 entities in total)
• Functional Keywords: hydrolase, dynamin, endocytosis, membrane fission, gtpase, intracellular trafficking
• Biological source: HOMO SAPIENS (HUMAN); More
• Cellular location: Cytoplasm : Q05193 Q05193
• Total number of polymer chains: 12
• Total formula weight: 1170444.19

Authors

Sundborger, A.C.,Fang, S.,Heymann, J.A.,Ray, P.,Chappie, J.S.,Hinshaw, J.E. (deposition date: 2014-07-29, release date: 2014-08-27, Last modification date: 2024-05-08)

Primary citation

Sundborger, A.C.,Fang, S.,Heymann, J.A.,Ray, P.,Chappie, J.S.,Hinshaw, J.E.
A Dynamin Mutant Defines a Superconstricted Prefission State.
Cell Rep., 8:734-, 2014

PubMed Abstract: 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.

PubMed: 25088425
DOI: 10.1016/J.CELREP.2014.06.054

Experimental method

ELECTRON MICROSCOPY (12.5 Å)