Journal
NATURE CELL BIOLOGY
Volume 12, Issue 2, Pages 164-U154Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncb2016
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Funding
- Eunice Kennedy Shriver National Institute of Child Health and Human Development Intramural funds [Z01 HD008816, Z01 HD008740]
- National Institutes of Health [R01 GM07159]
- Texas HEB [010019-0022-2006]
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The metazoan nuclear pore complex (NPC) disassembles during mitosis, and many of its constituents distribute onto spindles and kinetochores, including the Nup107-160 subcomplex(1,2). We have found that Nup107-160 interacts with the gamma-tubulin ring complex (gamma-TuRC), an essential and conserved microtubule nucleator(3,4), and recruits gamma-TuRC to unattached kinetochores. The unattached kinetochores nucleate microtubules in a manner that is regulated by Ran GTPase(5); such microtubules contribute to the formation of kinetochore fibres (k-fibres)(6), microtubule bundles connecting kinetochores to spindle poles. Our data indicate that Nup107-160 and gamma-TuRC act cooperatively to promote spindle assembly through microtubule nucleation at kinetochores: HeLa cells lacking Nup107-160 or gamma-TuRC were profoundly deficient in kinetochore-associated microtubule nucleation. Moreover, co-precipitated Nup107-160-gamma-TuRC complexes nucleated microtubule formation in assays using purified tubulin. Although Ran did not regulate microtubule nucleation by gamma-TuRC alone, Nup107-160-gamma-TuRC complexes required RanGTP for microtubule nucleation. Collectively, our observations show that Nup107-160 promotes spindle assembly through Ran-GTP-regulated nucleation of microtubules by gamma-TuRC at kinetochores, and reveal a relationship between nucleoporins and the microtubule cytoskeleton.
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