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Oscillations, Waves, and Interactions - GWDG

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450 S. Lakämper <strong>and</strong> C. F. Schmidt<br />

Figure 13. Full-length tetrameric Eg5 is a processive kinesin. (a) Frames from time-lapse<br />

recordings showing Eg5-GFP (green) moving along a microtubule (red). An asterisk (*)<br />

highlights one Eg5-GFP tetramer. The direction of motor movements is indicated by the<br />

green arrow. Bar, 2 mm. (b) Histogram of initial intensities of moving Eg5-GFP spots (n<br />

= 116). Mean intensity (Iavg) is indicated. (c) Kymographs depicting the motion of Eg5-<br />

GFP along microtubules in the presence of ATP (2 mM). The starting <strong>and</strong> ending points<br />

of a run are indicated by the green <strong>and</strong> the red arrows, respectively. Two examples of<br />

irregularities in the directional motility (that is, reversal in direction) are marked with<br />

yellow arrowheads. Bar, 2 mm. Inset: 3× magnifications of the framed area. Bar, 1 mm. (d)<br />

Histogram for the durations of Eg5-GFP-microtubule interactions of individual runs fitted<br />

by a single exponential. Average duration (t) is indicated (n = 239). (e) MSD calculated<br />

from Eg5-GFP motility recordings.The solid curve is a fit to MSD = 1/4v 2 t 2 + 2Dt + offset.<br />

Values of v <strong>and</strong> D are indicated (n = 80). (From Ref. [10]).

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