Reconstitution of dynamic microtubules with Drosophila XMAP215, EB1, and Sentin

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2012-11-26Author
Li, Wenjing
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Moriwaki, Takashi
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Tani, Tomomi
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Watanabe, Takashi
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Kaibuchi, Kozo
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Goshima, Gohta
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https://hdl.handle.net/1912/5596As published
https://doi.org/10.1083/jcb.201206101DOI
10.1083/jcb.201206101Abstract
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 of each 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 rate was 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.
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© The Author(s), 2012. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Journal of Cell Biology 199 (2012): 849-862, doi:10.1083/jcb.201206101.
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Article: Li, Wenjing, Moriwaki, Takashi, Tani, Tomomi, Watanabe, Takashi, Kaibuchi, Kozo, Goshima, Gohta, "Reconstitution of dynamic microtubules with Drosophila XMAP215, EB1, and Sentin", Journal of Cell Biology 199 (2012): 849-862, DOI:10.1083/jcb.201206101, https://hdl.handle.net/1912/5596The following license files are associated with this item:
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