Kinesin-6 Klp9 orchestrates spindle elongation by regulating microtubule sliding and growth

eLife

Liang Ji¹  Lara Katharina Krüger¹  Carlos Kikuti¹  Anne Houdusse¹  Phong T Tran²  Matthieu Gélin³  Laurent Blanchoin⁴  Manuel Théry⁴ 

[1] Institut Curie, PSL Research University, Sorbonne Université CNRS, UMR 144, Paris, France;Institut Curie, PSL Research University, Sorbonne Université CNRS, UMR 144, Paris, France;Department of Cell and Developmental Biology, University of Pennsylvania, Philadelphia, United States;Institut de Recherche Saint Louis,U976 Human Immunology Pathophysiology Immunotherapy (HIPI), CytoMorpho Lab, University of Paris, INSERM, CEA, Paris, France;Institut de Recherche Saint Louis,U976 Human Immunology Pathophysiology Immunotherapy (HIPI), CytoMorpho Lab, University of Paris, INSERM, CEA, Paris, France;Interdisciplinary Research Institute of Grenoble, Laboratoire de Physiologie Cellulaire & Végétale, CytoMorpho Lab, University of Grenoble-Alpes, CEA, CNRS, INRA, Grenoble, Paris, France;

关键词: mitosis;    mitotic spindle;    Kinesin-6;    microtubule polymerisation;    microtubule sliding;    XMAP215;    S. pombe;   

DOI  :  10.7554/eLife.67489

来源: eLife Sciences Publications, Ltd

【 摘 要 】

Mitotic spindle function depends on the precise regulation of microtubule dynamics and microtubule sliding. Throughout mitosis, both processes have to be orchestrated to establish and maintain spindle stability. We show that during anaphase B spindle elongation in Schizosaccharomyces pombe, the sliding motor Klp9 (kinesin-6) also promotes microtubule growth in vivo. In vitro, Klp9 can enhance and dampen microtubule growth, depending on the tubulin concentration. This indicates that the motor is able to promote and block tubulin subunit incorporation into the microtubule lattice in order to set a well-defined microtubule growth velocity. Moreover, Klp9 recruitment to spindle microtubules is dependent on its dephosphorylation mediated by XMAP215/Dis1, a microtubule polymerase, creating a link between the regulation of spindle length and spindle elongation velocity. Collectively, we unravel the mechanism of anaphase B, from Klp9 recruitment to the motors dual-function in regulating microtubule sliding and microtubule growth, allowing an inherent coordination of both processes.

【 授权许可】

CC BY