Reference: Ban R, et al. (2009) Mitotic regulation of the stability of microtubule plus-end tracking protein EB3 by ubiquitin ligase SIAH-1 and Aurora mitotic kinases. J Biol Chem 284(41):28367-28381

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Abstract


Microtubule plus-end tracking proteins (+TIPs) control microtubule dynamics in fundamental processes such as cell cycle, intracellular transport, and cell motility, but how +TIPs are regulated during mitosis remains largely unclear. Here we show that the endogenous end-binding protein family EB3 is stable during mitosis, facilitates cell cycle progression at prometaphase, and then is down-regulated during the transition to G(1) phase. The ubiquitin-protein isopeptide ligase SIAH-1 facilitates EB3 polyubiquitination and subsequent proteasome-mediated degradation, whereas SIAH-1 knockdown increases EB3 stability and steady-state levels. Two mitotic kinases, Aurora-A and Aurora-B, phosphorylate endogenous EB3 at Ser-176, and the phosphorylation triggers disruption of the EB3-SIAH-1 complex, resulting in EB3 stabilization during mitosis. Our results provide new insight into a regulatory mechanism of +TIPs in cell cycle transition.

Reference Type
Journal Article | Research Support, Non-U.S. Gov't
Authors
Ban R, Matsuzaki H, Akashi T, Sakashita G, Taniguchi H, Park SY, Tanaka H, Furukawa K, Urano T
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