The β-tubulin C-terminal tail modulates the coordination of microtubule assembly in an isotype-dependent manner. The β-tubulin C-terminal tail modulates.

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The β-tubulin C-terminal tail modulates the coordination of microtubule assembly in an isotype-dependent manner. The β-tubulin C-terminal tail modulates the coordination of microtubule assembly in an isotype-dependent manner. (A) Representative images and STICCS analysis of gene-edited NCI-H460 cells expressing the full-length βIII-tubulin protein (ZB3), truncated βIII-tubulin protein (ZB3Δ), and βIII-tubulin body with βI-tubulin tail (ZB3/CB1). (i) Raw images of tubulin-GFP (left) and EB3-RFP (center) and merged image (right) at a single time point. (ii) STICCS vector maps showing the velocity of the movement in a single time block. The direction of the arrows indicates the direction of movement of the tubulin-GFP (left), EB3-RFP (center), and cross-correlation of GFP and EB3 (right); and the color indicates the speed of movement. Scale bar 5 μm. (B) Representative close-up images of the regions of the ZB3 cells indicated by the white boxes for microtubule and EB3 movement between the time t0 and Δt for the GFP (left panel), EB3 (center panel), and merged (right panel) channel showing microtubule assembly that do (i) and do not (ii) correlate with tubulin movement, together with the STICCS vector maps corresponding to these ROI and TOI regions (lower panel) for the GFP autocorrelation (left panel), EB3 autocorrelation (center panel), and cross-correlation between GFP and EB3 (right panel). Blue arrows indicate microtubule assembly events that are (i) and are not (ii) correlated. Microtubule assembly along existing microtubule fibers (ii) is shown as noncorrelating microtubule assembly. Conversely, explorative microtubule growth where the GFP and EB3 signals proceed at the similar rate into new territory (ii) is measured as a correlated STICCS event (i). Scale bar 2 μm. (C) Microtubule assembly dynamics as measured by STICCS, showing the speed of cross-correlated movement between the microtubule and EB3 channels (i) and the proportion of microtubule assembly events that are cross-correlated with the movement of microtubules (ii). Graphs give the median, box gives the 25th to the 75th percentile, and whiskers give the minimum and maximum values of at least 10 cells from two independent experiments. *P < 0.05, **P < 0.01, ***P < 0.001, and ****P < 0.0001 relative to cells expressing the full-length βIII-tubulin protein. Corresponding values are presented in Table S1. Amelia L Parker et al. LSA 2018;1:e201800059 © 2018 Parker et al.