Self-Organization of Microtubule Asters Induced in Xenopus Egg Extracts by GTP-Bound Ran

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Science  21 May 1999:
Vol. 284, Issue 5418, pp. 1356-1358
DOI: 10.1126/science.284.5418.1356

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The nucleotide exchange activity of RCC1, the only known nucleotide exchange factor for Ran, a Ras-like small guanosine triphosphatase, was required for microtubule aster formation with or without demembranated sperm in Xenopus egg extracts arrested in meiosis II. Consistently, in the RCC1-depleted egg extracts, Ran guanosine triphosphate (RanGTP), but not Ran guanosine diphosphate (RanGDP), induced self-organization of microtubule asters, and the process required the activity of dynein. Thus, Ran was shown to regulate formation of the microtubule network.

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