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Anillin-mediated targeting of peanut to pseudocleavage furrows is regulated by the GTPase Ran.

Mol Biol Cell. 2008 Sep;19(9):3735-44. Epub 2008 Jun 25
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摘要


During early development in Drosophila, pseudocleavage furrows in the syncytial embryo prevent contact between neighboring spindles, thereby ensuring proper chromosome segregation. Here we demonstrate that the GTPase Ran regulates pseudocleavage furrow organization. Ran can exert control on pseudocleavage furrows independently of its role in regulating the microtubule cytoskeleton. Disruption of the Ran pathway prevented pseudocleavage furrow formation and restricted the depth and duration of furrow ingression of those pseudocleavage furrows that did form. We found that Ran was required for the localization of the septin Peanut to the pseudocleavage furrow, but not anillin or actin. Biochemical assays revealed that the direct binding of the nuclear transport receptors importin alpha and beta to anillin prevented the binding of Peanut to anillin. Furthermore, RanGTP reversed the inhibitory action of importin alpha and beta. On expression of a mutant form of anillin that lacked an importin alpha and beta binding site, inhibition of Ran no longer restricted the depth and duration of furrow ingression in those pseudocleavage furrows that formed. These data suggest that anillin and Peanut are involved in pseudocleavage furrow ingression in syncytial embryos and that this process is regulated by Ran.

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