Surfing, regulating and capturing: are all microtubule-tip-tracking proteins created equal?

Trends in Cell Biology
Kevin T Vaughan

Abstract

A diverse group of microtubule-binding proteins has been linked through live-cell imaging of green fluorescent protein (GFP) fusion proteins. These proteins share the ability to associate with the plus ends of elongating microtubules and track with these tips as the microtubules grow, in a process known as "tip tracking". Several models have been proposed to explain the significance of this activity, including roles in delivering proteins to the cell periphery and in modulating microtubule dynamics. However, the recent observation that some of the tip trackers colocalize on structures undergoing search-capture suggests that tip tracking could be a fundamental aspect of the search-capture process. Focusing on the shared ability of these proteins to undergo tip tracking, this article is intended to place the search-capture model in the context of other proposed functions and to stimulate discussion in this area.

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