Regulation of p53 by Mdm2 E3 ligase function is dispensable in embryogenesis and development, but essential in response to DNA damage.
Regulation of p53 by Mdm2 E3 ligase function is dispensable in embryogenesis and development, but essential in response to DNA damage.
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DOI:
10.1016/j.ccr.2014.06.006
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发表时间:
2014-08-11
期刊:
影响因子:
50.3
通讯作者:
Zhang Y
中科院分区:
文献类型:
--
作者:
Tollini LA;Jin A;Park J;Zhang Y
Mdm2 E3 ubiquitin ligase-mediated p53 degradation is generally accepted as the major mechanism for p53 regulation; nevertheless, the in vivo significance of this function has not been unequivocally established. Here, we have generated an Mdm2Y487A knock-in mouse; Mdm2Y487A mutation inactivates Mdm2 E3 ligase function without affecting its ability to bind its homologue MdmX. Unexpectedly, Mdm2Y487A/Y487A mice were viable and developed normally into adulthood. While disruption of Mdm2 E3 ligase function resulted in p53 accumulation, p53 transcriptional activity remained low; however, exposure to sub-lethal stress resulted in hyperactive p53 and p53-dependent mortality in Mdm2Y487A/Y487A mice. These findings reveal a potentially dispensable nature for Mdm2 E3 ligase function in p53 regulation, providing insight that may affect how this pathway is targeted therapeutically.
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