ICIS and Aurora B coregulate the microtubule depolymerase Kif2a.
ICIS and Aurora B coregulate the microtubule depolymerase Kif2a.
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DOI:
10.1016/j.cub.2009.03.018
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发表时间:
2009-05-12
期刊:
影响因子:
--
通讯作者:
Stukenberg PT
中科院分区:
文献类型:
--
作者:
Knowlton AL;Vorozhko VV;Lan W;Gorbsky GJ;Stukenberg PT
Kinesins in the mitotic spindle play major roles in determining spindle shape, size, and bipolarity, although specific regulation of these kinesins at distinct locations on the spindle is poorly understood. To balance the forces that are required for spindle bipolarity, microtubule-depolymerizing kinesins are tightly regulated. Aurora B kinase phosphorylates the neck regions of the kinesin-13 family microtubule depolymerases Kif2a and MCAK (Mitotic Centromere Associated Kinesin), and inhibits their depolymerase activities. How they are reactivated, and how this is controlled independently on different kinetochore fibers is unknown. We show that Inner Centromere Kin-I Stimulator (ICIS), which stimulates the related depolymerase MCAK, can reactivate Kif2a after Aurora B inhibition. When antibodies that block the ability of ICIS to activate Kif2a are injected into cells, monopolar spindles are generated. This phenotype is rescued by co-injection of anti-Nuf2 antibodies. We have performed a structure-function analysis of the ICIS protein, and find that the N-terminus of ICIS binds Aurora B and its regulators INCENP and TD60, while a central region binds MCAK, Kif2a and microtubules, suggesting a scaffold function for ICIS. These data argue that ICIS and the CPC (Chromosomal Passenger Complex) regulate Kif2a depolymerase activity.
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影响因子:
3.3
作者:
Kline-Smith, SL;Khodjakov, A;Walczak, CE
通讯作者:
Walczak, CE
影响因子:
56.9
作者:
Rosasco-Nitcher, Sara E.;Lan, Weijie;Stukenberg, P. Todd
通讯作者:
Stukenberg, P. Todd
影响因子:
10.5
作者:
McCleland, ML;Gardner, RD;Stukenberg, PT
通讯作者:
Stukenberg, PT
DOI:
10.1083/jcb.200404012
发表时间:
2004-08-16
期刊:
The Journal of cell biology
影响因子:
--
作者:
Ganem NJ;Compton DA
通讯作者:
Compton DA
影响因子:
9.2
作者:
Knowlton, Anne Lide;Lan, Weijie;Stukenberg, P. Todd
通讯作者:
Stukenberg, P. Todd