Metabolic control of G1-S transition: cyclin E degradation by p53-induced activation of the ubiquitin-proteasome system.

Metabolic control of G1-S transition: cyclin E degradation by p53-induced activation of the ubiquitin-proteasome system.
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DOI:
10.1083/jcb.200912024
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发表时间:
2010-02-22
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Banerjee U
Banerjee U
中科院分区:
其他
文献类型:
--
作者:
Mandal S;Freije WA;Guptan P;Banerjee U

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When mitochondrial function fails, p53 is recruited to get rid of cyclin E, bringing mitotic progression to a halt. Cell cycle progression is precisely regulated by diverse extrinsic and intrinsic cellular factors. Previous genetic analysis in Drosophila melanogaster has shown that disruption of the mitochondrial electron transport chain activates a G1–S checkpoint as a result of a control of cyclin E by p53. This regulation does not involve activation of the p27 homologue dacapo in flies. We demonstrate that regulation of cyclin E is not at the level of transcription or translation. Rather, attenuated mitochondrial activity leads to transcriptional upregulation of the F-box protein archipelago, the Fbxw7 homologue in flies. We establish that archipelago and the proteasomal machinery contribute to degradation of cyclin E in response to mitochondrial dysfunction. Our work provides in vivo genetic evidence for p53-mediated integration of metabolic stress signals, which modulate the activity of the ubiquitin–proteasome system to degrade cyclin E protein and thereby impose cell cycle arrest.
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