Kif18B interacts with EB1 and controls astral microtubule length during mitosis

Jane R. Stout, Amber L. Yount, James A. Powers, Chantal LeBlanc, Stephanie C. Ems-McClung, Claire Walczak

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

Regulation of microtubule (MT) dynamics is essential for proper spindle assembly and organization. Kinesin-8 family members are plus-end-directed motors that modulate plus-end MT dynamics by acting as MT depolymerases or as MT plus-end capping proteins. In this paper, we show that the human kinesin-8 Kif18B functions during mitosis to control astral MT organization. Kif18B is a MT plus-tip-tracking protein that localizes to the nucleus in interphase and is enriched at astral MT plus ends during early mitosis. Knockdown of Kif18B caused spindle defects, resulting in an increased number and length of MTs. A yeast two-hybrid screen identified an interaction of the C-terminal domain of Kif18B with the plus-end MT-binding protein EB1. EB1 knockdown disrupted Kif18B targeting to MT plus ends, indicating that EB1/Kif18B interaction is physiologically important. This interaction is direct, as the far C-terminal end of Kif18B is sufficient for binding to EB1 in vitro. Overexpression of this domain is sufficient for plus-end MT targeting in cells; however, targeting is enhanced by the motor domain, which cooperates with the tail to achieve proper Kif18B localization at MT plus ends. Our results suggest that Kif18B is a new MT dynamics regulatory protein that interacts with EB1 to control astral MT length.

Original languageEnglish
Pages (from-to)3070-3080
Number of pages11
JournalMolecular Biology of the Cell
Volume22
Issue number17
DOIs
StatePublished - Sep 1 2011

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Mitosis
Microtubules
Kinesin
Organizations
Proteins
Interphase
Tail
Yeasts

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology

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Kif18B interacts with EB1 and controls astral microtubule length during mitosis. / Stout, Jane R.; Yount, Amber L.; Powers, James A.; LeBlanc, Chantal; Ems-McClung, Stephanie C.; Walczak, Claire.

In: Molecular Biology of the Cell, Vol. 22, No. 17, 01.09.2011, p. 3070-3080.

Research output: Contribution to journalArticle

Stout, Jane R. ; Yount, Amber L. ; Powers, James A. ; LeBlanc, Chantal ; Ems-McClung, Stephanie C. ; Walczak, Claire. / Kif18B interacts with EB1 and controls astral microtubule length during mitosis. In: Molecular Biology of the Cell. 2011 ; Vol. 22, No. 17. pp. 3070-3080.
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