Movie S3.

Diffusion of αTAT1-GFP on GMPCPP-stabilized microtubules. The movie shows a microtubule in red, and fluorescent αTAT1-GFP in green. Time-lapse images are collected every 380 ms. In this movie, motile αTAT1 GFP lands on a microtubule, diffuses, and then suddenly “jumps” to a nearby microtubule, consistent with diffusion on the external surface of the microtubules.