Rapid microtubule self-assembly kinetics.

Rapid microtubule self-assembly kinetics.
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DOI:
10.1016/j.cell.2011.06.053
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发表时间:
2011-08-19
期刊:
影响因子:
64.5
通讯作者:
Odde DJ
Odde DJ
中科院分区:
生物学1区
文献类型:
--
作者:
Gardner MK;Charlebois BD;Jánosi IM;Howard J;Hunt AJ;Odde DJ

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Microtubule assembly is vital for many fundamental cellular processes. Current models for microtubule assembly kinetics assume that the subunit disassociation rate from a microtubule tip is independent of free subunit concentration. Using Total-Internal-Reflection-Fluorescence (TIRF) microscopy and a laser tweezers assay to measure in vitro microtubule assembly with nanometer resolution, we find that the subunit dissociation rate from a microtubule tip increases as the free subunit concentration increases. These data are consistent with a two-dimensional model for microtubule assembly, and are explained by a shift in microtubule tip structure from a relatively blunt shape at low free concentrations to relatively tapered at high free concentrations. Because both the association and the dissociation rates increase at higher free subunit concentrations, we find that the kinetics of microtubule assembly are an order-of-magnitude higher than currently estimated in the literature.
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