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Antizyme, a mediator of ubiquitin-independent proteasomal degradation and its inhibitor localize to centrosomes and modulate centriole amplification.

Authors: Mangold, U  Hayakawa, H  Coughlin, M  M√ľnger, K  Zetter, B R 
Citation: Mangold U, etal., Oncogene. 2008 Jan 24;27(5):604-13. doi: 10.1038/sj.onc.1210685. Epub 2007 Jul 30.
Pubmed: (View Article at PubMed) PMID:17667942
DOI: Full-text: DOI:10.1038/sj.onc.1210685

The potential tumor suppressor antizyme and its endogenous inhibitor (antizyme inhibitor, AZI) have been implicated in the ubiquitin-independent proteasomal degradation of proteins involved in cell proliferation as well as in the regulation of polyamine levels. We show here that both antizyme and AZI concentrate at centrosomes and that antizyme preferentially associates with the maternal centriole. Interestingly, alterations in the levels of these proteins have opposing effects on centrosomes. Depletion of antizyme in various cell lines and primary cells leads to centrosome overduplication, whereas overexpression of antizyme reduces numerical centrosome abnormalities. Conversely, silencing of the antizyme inhibitor, AZI, results in a decrease of numerical centrosome abnormalities, whereas overexpression of AZI leads to centrosome overduplication. We further show that the numerical centrosome abnormalities are due to daughter centriole amplification. In summary, our results demonstrate that alterations in the antizyme/AZI balance cause numerical centrosomal defects and suggest a role for ubiquitin-independent proteasomal degradation in centrosome duplication.

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CRRD Object Information
CRRD ID: 14700805
Created: 2019-08-19
Species: All species
Last Modified: 2019-08-19
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.