Figure 7. MAP7 family proteins are required for the transport of Rab6 vesicles.
(A) Western blot analysis of the extracts of control or MAP7 knockout (MAP7-KO) HeLa cells or MAP7-KO cells transfected with siRNAs against MAPD1 and MAP7D3 (MAP7-KO+MAP7D1/3-KO) with the indicated antibodies. (B–D) GFP-Rab6A was expressed and imaged using TIRFM in Hela cells described in (A). Automatic tracking using the SOS/MTrackJ plugin (500 consecutive frames, 100 ms interval) of the Rab6A signal (B), number of Rab6 vesicle runs per cell, n = 20 cells in two experiment in each condition (C) and the frequency distributions of Rab6 vesicle speeds after automatic tracking annotated with the mean ± SD (D) are shown. n = 5038, 4056 and 2366 tracks from 20 cells in two independent experiments. Mann-Whitney U test: ***p=0.0002, ns, no significant difference.