A dynamin mutant defines a superconstricted prefission state.
A dynamin mutant defines a superconstricted prefission state.
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DOI:
10.1016/j.celrep.2014.06.054
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发表时间:
2014-08-07
期刊:
影响因子:
8.8
通讯作者:
Hinshaw JE
中科院分区:
文献类型:
--
作者:
Sundborger AC;Fang S;Heymann JA;Ray P;Chappie JS;Hinshaw JE
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 pre-fission 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 super-constricted pre-fission state and reveals how a 2-start helical symmetry promotes the most efficient packing of dynamin tetramers around the membrane neck. These data suggest a new model for the assembly and regulation of the minimal dynamin fission machine.
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