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Nucleotide-dependent conformational changes in dynamin: evidence for a mechanochemical molecular spring

Nucleotide-dependent conformational changes in dynamin: evidence for a mechanochemical molecular... The GTPase dynamin plays an essential part in endocytosis by catalysing the fission of nascent clathrin-coated vesicles from the plasma membrane. Using preformed phosphatidylinositol-4,5-bisphosphate-containing lipid nanotubes as a membrane template for dynamin self-assembly, we investigate the conformational changes that arise during GTP hydrolysis by dynamin. Electron microscopy reveals that, in the GTP-bound state, dynamin rings appear to be tightly packed together. After GTP hydrolysis, the spacing between rings increases nearly twofold. When bound to the nanotubes, dynamin"s GTPase activity is cooperative and is increased by three orders of magnitude compared with the activity of unbound dynamin. An increase in the k cat (but not the K m) of GTP hydrolysis accounts for the pronounced cooperativity. These data indicate that a novel, lengthwise (‘spring-like’) conformational change in a dynamin helix may participate in vesicle fission. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nature Cell Biology Springer Journals

Nucleotide-dependent conformational changes in dynamin: evidence for a mechanochemical molecular spring

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References (53)

Publisher
Springer Journals
Copyright
Copyright © 1999 by Macmillan Magazines Ltd.
Subject
Life Sciences; Life Sciences, general; Cell Biology; Cancer Research; Developmental Biology; Stem Cells
ISSN
1465-7392
eISSN
1476-4679
DOI
10.1038/8997
Publisher site
See Article on Publisher Site

Abstract

The GTPase dynamin plays an essential part in endocytosis by catalysing the fission of nascent clathrin-coated vesicles from the plasma membrane. Using preformed phosphatidylinositol-4,5-bisphosphate-containing lipid nanotubes as a membrane template for dynamin self-assembly, we investigate the conformational changes that arise during GTP hydrolysis by dynamin. Electron microscopy reveals that, in the GTP-bound state, dynamin rings appear to be tightly packed together. After GTP hydrolysis, the spacing between rings increases nearly twofold. When bound to the nanotubes, dynamin"s GTPase activity is cooperative and is increased by three orders of magnitude compared with the activity of unbound dynamin. An increase in the k cat (but not the K m) of GTP hydrolysis accounts for the pronounced cooperativity. These data indicate that a novel, lengthwise (‘spring-like’) conformational change in a dynamin helix may participate in vesicle fission.

Journal

Nature Cell BiologySpringer Journals

Published: May 1, 1999

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