Microtubule dynamics depart from wormlike chain model

Details Microtubule dynamics depart from wormlike chain model Microtubule dynamics depart from wormlike chain model

2007-08-14

arxiv.org/abs/0708.1928v2

Physical Review Letters (2008), 100:028102.

Biology

Quantitative Biology

Biomolecules

4 pages, 4 figures. Updated content, added reference, corrected typos

Scientific paper

10.1103/PhysRevLett.100.028102

Thermal shape fluctuations of grafted microtubules were studied using high resolution particle tracking of attached fluorescent beads. First mode relaxation times were extracted from the mean square displacement in the transverse coordinate. For microtubules shorter than 10 um, the relaxation times were found to follow an L^2 dependence instead of L^4 as expected from the standard wormlike chain model. This length dependence is shown to result from a complex length dependence of the bending stiffness which can be understood as a result of the molecular architecture of microtubules. For microtubules shorter than 5 um, high drag coefficients indicate contributions from internal friction to the fluctuation dynamics.

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