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XB-ART-7270
EMBO Rep 2002 May 01;35:457-62. doi: 10.1093/embo-reports/kvf095.
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APC/Fizzy-Related targets Aurora-A kinase for proteolysis.

Castro A , Arlot-Bonnemains Y , Vigneron S , Labbé JC , Prigent C , Lorca T .


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Aurora-A kinase is a mitotic spindle-pole-associated protein that has been implicated in duplication and separation of centrosomes and in spindle assembly. The proper timing and amplitude of Aurora-A expression seems to be important, as elevated levels of this protein have been associated with centrosome abnormalities and aneuploidy in mammalian cells. We show that Aurora-A increases at the G2-M transistion and disappears completely at G1 in XL2 cells. Using Xenopus oocyte extracts, we demonstrate that degradation of Aurora-A is mediated by the anaphase-promoting complex (APC) and is regulated by Fizzy-Related but not by Fizzy. Degradation of Aurora-A depends on a D-Box, but not on its KEN-Box motif, as mutation of its C-terminal D-Box sequence induces stabilization of the protein. Accordingly, addition into the extracts of a cyclin B-type D-Box-motif-containing peptide completely suppresses its degradation. Furthermore, APC/Fizzy-Related ubiquitylates the wild type but not a D-Box mutant form of Aurora-A in vitro. Consistent with these data, ectopic expression of Fizzy-Related in Xenopus oocytes induces complete degradation of endogenous Aurora-A. Aurora-A is thus the first protein, at least in our assay system, that undergoes a D-Box-dependent degradation mediated by APC/Fizzy-Related but not by APC/Fizzy.

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Species referenced: Xenopus
Genes referenced: aurka ccnb1.2

References [+] :
Arlot-Bonnemains, Identification of a functional destruction box in the Xenopus laevis aurora-A kinase pEg2. 2001, Pubmed, Xenbase