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XB-ART-34588
Curr Biol 2006 Apr 18;168:743-54. doi: 10.1016/j.cub.2006.03.056.
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HURP is part of a Ran-dependent complex involved in spindle formation.

Koffa MD , Casanova CM , Santarella R , Köcher T , Wilm M , Mattaj IW .


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BACKGROUND: GTP-loaded Ran induces the assembly of microtubules into aster-like and spindle-like structures in Xenopus egg extract. The microtubule-associated protein (MAP), TPX2, can mediate Ran's role in aster formation, but factors responsible for the transition from aster-like to spindle-like structures have not been described. RESULTS: Here we identify a complex that is required for the conversion of aster-like to spindle-like structures. The complex consists of two characterized MAPs (TPX2, XMAP215), a plus end-directed motor (Eg5), a mitotic kinase (Aurora A), and HURP, a protein associated with hepatocellular carcinoma. Formation and function of the complex is dependent on Aurora A activity. HURP protein was further characterized and shown to bind microtubules and affect their organization both in vitro and in vivo. In egg extract, anti-HURP antibodies disrupt the formation of both Ran-dependent and chromatin and centrosome-induced spindles. HURP is also required for the proper formation and function of mitotic spindles in HeLa cells. CONCLUSIONS: HURP is a new and essential component of the mitotic apparatus. HURP acts as part of a multicomponent complex that affects the growth or stability of spindle MTs and is required for spindle MT organization.

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Species referenced: Xenopus
Genes referenced: dlgap5 ran tpx2

References :
Sanderson, Cell biology: Ran, mitosis and the cancer connection. 2006, Pubmed, Xenbase