Reconstitution of dynamic microtubules with drosophila XMAP215, EB1, and sentin

Wenjing Li, Takashi Moriwaki, Tomomi Tani, Takashi Watanabe, Kozo Kaibuchi, Gohta Goshima

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

Dynamic microtubules (MTs) are essential for various intracellular events, such as mitosis. In Drosophila melanogaster S2 cells, three MT tip-localizing proteins, Msps/XMAP215, EB1, and Sentin (an EB1 cargo protein), have been identified as being critical for accelerating MT growth and promoting catastrophe events, thus resulting in the formation of dynamic MTs. However, the molecular activity ofeach protein and the basis of the modulation of MT dynamics by these three factors are unknown. In this paper, we showed in vitro that XMAP215msps had a potent growth-promoting activity at a wide range of tubulin concentrations, whereas Sentin, when recruited by EB1 to the growing MT tip, accelerated growth and also increased catastrophe frequency. When all three factors were combined, the growth ratewas synergistically enhanced, and rescue events were observed most frequently, but frequent catastrophes restrained the lengthening of the MTs. We propose that MT dynamics are promoted by the independent as well as the cooperative action of XMAP215msps polymerase and the EB1-Sentin duo.

Original languageEnglish
Pages (from-to)849-862
Number of pages14
JournalJournal of Cell Biology
Volume199
Issue number5
DOIs
Publication statusPublished - 11-2012

All Science Journal Classification (ASJC) codes

  • Cell Biology

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