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XB-ART-9480
Science 2001 Jan 26;2915504:653-6. doi: 10.1126/science.1057661.
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Role of importin-beta in coupling Ran to downstream targets in microtubule assembly.

Wiese C, Wilde A, Moore MS, Adam SA, Merdes A, Zheng Y.


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The guanosine triphosphatase Ran stimulates assembly of microtubule asters and spindles in mitotic Xenopus egg extracts. A carboxyl-terminal region of the nuclear-mitotic apparatus protein (NuMA), a nuclear protein required for organizing mitotic spindle poles, mimics Ran's ability to induce asters. This NuMA fragment also specifically interacted with the nuclear transport factor, importin-beta. We show that importin-beta is an inhibitor of microtubule aster assembly in Xenopus egg extracts and that Ran regulates the interaction between importin-beta and NuMA. Importin-beta therefore links NuMA to regulation by Ran. This suggests that similar mechanisms regulate nuclear import during interphase and spindle assembly during mitosis.

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Species referenced: Xenopus
Genes referenced: numa1 ran