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Life Sci Alliance. 2018 May;1(2). pii: e201800054. doi: 10.26508/lsa.201800054. Epub 2018 Apr 19.

Regulation of microtubule dynamic instability by the carboxy-terminal tail of β-tubulin.

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1
Department of Cell and Developmental Biology, University of Colorado School of Medicine, Aurora, CO, USA.

Abstract

Dynamic instability is an intrinsic property of microtubules; however, we do not understand what domains of αβ-tubulins regulate this activity or how these regulate microtubule networks in cells. Here, we define a role for the negatively charged carboxy-terminal tail (CTT) domain of β-tubulin in regulating dynamic instability. By combining in vitro studies with purified mammalian tubulin and in vivo studies with tubulin mutants in budding yeast, we demonstrate that β-tubulin CTT inhibits microtubule stability and regulates the structure and stability of microtubule plus ends. Tubulin that lacks β-tubulin CTT polymerizes faster and depolymerizes slower in vitro and forms microtubules that are more prone to catastrophe. The ends of these microtubules exhibit a more blunted morphology and rapidly switch to disassembly after tubulin depletion. In addition, we show that β-tubulin CTT is required for magnesium cations to promote depolymerization. We propose that β-tubulin CTT regulates the assembly of stable microtubule ends and provides a tunable mechanism to coordinate dynamic instability with ionic strength in the cell.

Conflict of interest statement

Conflict of Interest Statement The authors declare that they have no conflict of interest.

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