Photoactivatable-GFP-α-tubulin as a tool to study microtubule plus-end turnover in living human cells.

The development of photactivatable (PA) variants of Green fluorescent protein (GFP) has allowed the dynamics of spatially restricted protein pools within living cells to be determined. Over the last 5 years, experiments utilizing PA-GFP fused to α-tubulin have provided important insights into the mechanisms that control microtubule dynamics in living cells. In this chapter, we describe the methodology required to generate stable cell lines expressing photoactivatable-GFP-α-tubulin and to derive quantitative measurements of tubulin turnover at microtubules plus-ends in living cells.