CRY2 and FBXL3 Cooperatively Degrade c-MYC.

CRY2 and FBXL3 Cooperatively Degrade c-MYC.
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FBXL 2和FBXL 3协同降解c-MYC。

DOI:
10.1016/j.molcel.2016.10.012
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发表时间:
2016-11-17
期刊:
影响因子:
16
通讯作者:
Lamia, Katja A.
Lamia, Katja A.
中科院分区:
生物学1区
文献类型:
--
作者:
Huber, Anne-Laure;Papp, Stephanie J.;Chan, Alanna B.;Henriksson, Emma;Jordan, Sabine D.;Kriebs, Anna;Nguyen, Madelena;Wallace, Martina;Li, Zhizhong;Metallo, Christian M.;Lamia, Katja A.

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多年来,人们一直认为生物钟和癌症之间存在联系。在这里,我们描述了昼夜节律抑制因子CRY2作为含fbxl3的E3连接酶的一个意想不到的功能,该连接酶募集t58磷酸化的c-MYC进行泛素化。c-MYC是细胞增殖的关键调节因子;T58在一个长期被认为是癌症突变热点的磷子中处于中心位置。这个地点也是FBXW7的目标,尽管导致其营业额的完整机制仍然不清楚。CRY1不能代替CRY2促进c-MYC降解;它们的独特功能或许可以解释之前相互矛盾的报道,这些报道助长了生物钟与癌症之间关系的不确定性。因此,我们证明c-MYC是cry2依赖性蛋白周转的靶标,这提示了细胞生长昼夜节律控制的分子机制和昼夜节律蛋白降解的新范式。昼夜节律紊乱会增加患多种癌症的风险。Huber等人证明,生物钟蛋白CRY2将t58磷酸化的c-MYC招募到SCFFBXL3,从而促进其泛素化和降解。CRY2的这种意想不到的功能可能有助于防止肿瘤发生的昼夜节律保护。
For many years, a connection between circadian clocks and cancer has been postulated. Here, we describe an unexpected function for the circadian repressor CRY2 as a component of an FBXL3-containing E3 ligase that recruits T58-phosphorylated c-MYC for ubiquitylation. c-MYC is a critical regulator of cell proliferation; T58 is central in a phosphodegron long recognized as a hotspot for mutation in cancer. This site is also targeted by FBXW7, though the full machinery responsible for its turnover has remained obscure. CRY1 cannot substitute for CRY2 in promoting c-MYC degradation; their unique functions may explain prior conflicting reports that have fueled uncertainty about the relationship between clocks and cancer. Thus, we demonstrate that c-MYC is a target of CRY2-dependent protein turnover, suggesting a molecular mechanism for circadian control of cell growth and a new paradigm for circadian protein degradation. Circadian disruption increases the risk of many types of cancer. Huber et al. demonstrate that the circadian clock protein CRY2 recruits T58-phosphorylated c-MYC to SCFFBXL3, thus promoting its ubiquitination and degradation. This unexpected function of CRY2 may contribute to circadian protection from tumorigenesis.
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