Force production by disassembling microtubules

Ekaterina L. Grishchuk, Maxim I. Molodtsov, Fazly I. Ataullakhanov and J. Richard McIntosh ()
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Ekaterina L. Grishchuk: University of Colorado at Boulder
Maxim I. Molodtsov: University of Colorado at Boulder
Fazly I. Ataullakhanov: National Research Centre for Haematology
J. Richard McIntosh: University of Colorado at Boulder

Nature, 2005, vol. 438, issue 7066, 384-388

Abstract: Abstract Microtubules (MTs) are important components of the eukaryotic cytoskeleton: they contribute to cell shape and movement, as well as to the motions of organelles including mitotic chromosomes. MTs bind motor enzymes that drive many such movements, but MT dynamics can also contribute to organelle motility1,2,3,4,5,6,7,8. Each MT polymer is a store of chemical energy that can be used to do mechanical work, but how this energy is converted to motility remains unknown. Here we show, by conjugating glass microbeads to tubulin polymers through strong inert linkages, such as biotin–avidin, that depolymerizing MTs exert a brief tug on the beads, as measured with laser tweezers. Analysis of these interactions with a molecular-mechanical model of MT structure and force production9,10 shows that a single depolymerizing MT can generate about ten times the force that is developed by a motor enzyme; thus, this mechanism might be the primary driving force for chromosome motion. Because even the simple coupler used here slows MT disassembly, physiological couplers may modulate MT dynamics in vivo.

Date: 2005
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DOI: 10.1038/nature04132

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