Abstract
The mitotic kinase Aurora A (Aur-A) is required for formation of a bipolar mitotic spindle and accurate chromosome segregation. In somatic cells, Aur-A protein and kinase activity levels peak during mitosis, and Aur-A is degraded during mitotic exit. Here, we investigated how Aur-A protein and kinase activity levels are regulated, taking advantage of the rapid synchronous cell division cycles ofXenopus eggs and cell-free systems derived from them. Aur-A kinase activity oscillates in the early embryonic cell cycles, just as in somatic cells, but Aur-A protein levels are constant, indicating that regulated activation and inactivation, instead of periodic proteolysis, is the dominant mode of Aur-A regulation in these cell cycles. Cdh1, the APC/C activator that targets many mitotic proteins for ubiquitin-dependent proteolysis during late mitosis and G1 in somatic cells, is missing in Xenopus eggs and early embryos. We find that addition of Cdh1 to egg extracts undergoing M phase exit is sufficient to induce rapid degradation of Aur-A. Aur-A contains both of the two known APC/C recognition signals, (1) a C-terminal D box similar to those required for ubiquitin-dependent destruction of cyclin B and several other mitotic proteins, and (2) an N-terminal KEN box similar to that found on cdc20, which is ubiquitinated in response to APC/CCdh1. The D box is required for Cdh1-induced destruction of Aur-A but the KEN box is not. Destruction also requires a short region in the N terminus, which contains a newly identified recognition signal, the A box. The A box is conserved in vertebrate Aur-As and contains serine 53, which is phosphorylated during M phase. Mutation of serine 53 to aspartic acid, which can mimic the effect of phosphorylation, completely blocks Cdh1-dependent destruction of Aur-A. These results suggest that dephosphorylation of serine 53 during mitotic exit could control the timing of Aur-A destruction, allowing recognition of both the A box and D box by Cdh1-activated APC/C.
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{'key': '2021111508092528000_16.17.2274.57', 'first-page': '708', 'article-title': 'Progression into and out of mitosis. Curr. Opin.', 'volume': '11', 'author': 'Zachariae', 'year': '1999', 'journal-title': 'Cell Biol.'}
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Dates
Type | When |
---|---|
Created | 22 years, 11 months ago (Sept. 3, 2002, 12:44 p.m.) |
Deposited | 3 years, 9 months ago (Nov. 15, 2021, 11:14 a.m.) |
Indexed | 1 month, 4 weeks ago (June 26, 2025, 2:24 p.m.) |
Issued | 22 years, 11 months ago (Sept. 1, 2002) |
Published | 22 years, 11 months ago (Sept. 1, 2002) |
Published Online | 22 years, 11 months ago (Sept. 1, 2002) |
Published Print | 22 years, 11 months ago (Sept. 1, 2002) |
@article{Littlepage_2002, title={Identification of a new APC/C recognition domain, the A box, which is required for the Cdh1-dependent destruction of the kinase Aurora-A during mitotic exit}, volume={16}, ISSN={1549-5477}, url={http://dx.doi.org/10.1101/gad.1007302}, DOI={10.1101/gad.1007302}, number={17}, journal={Genes & Development}, publisher={Cold Spring Harbor Laboratory}, author={Littlepage, Laurie E. and Ruderman, Joan V.}, year={2002}, month=sep, pages={2274–2285} }