The RNA Surveillance Factor UPF1 Represses Myogenesis via Its E3 Ubiquitin Ligase Activity.

The RNA Surveillance Factor UPF1 Represses Myogenesis via Its E3 Ubiquitin Ligase Activity.
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DOI:
10.1016/j.molcel.2017.05.034
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发表时间:
2017-07-20
期刊:
影响因子:
16
通讯作者:
Bradley RK
Bradley RK
中科院分区:
生物学1区
文献类型:
--
作者:
Feng Q;Jagannathan S;Bradley RK

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UPF1是一种RNA解旋酶,它协调无义介导的衰变和其他RNA监视途径。虽然UPF1以其降解异常rna的基础细胞保护作用而闻名,但UPF1也降解特定的正常发生的mrna来调节各种细胞过程。在这里,我们描述了UPF1在调节蛋白质衰变中的作用,其中UPF1作为E3泛素连接酶抑制人类骨骼肌分化。抑制UPF1加速肌肉生成,而异位增加UPF1水平则减缓肌肉生成。UPF1促进MYOD蛋白的衰变,而MYOD mRNA的稳定性不受影响,MYOD蛋白是一种肌肉发生的主要调节因子。UPF1通过其环结构域作为E3连接酶促进MYOD蛋白泛素化和降解。我们的数据表征了UPF1在肌肉发生中的调节作用,并证明UPF1在人类细胞中提供了RNA和蛋白质衰变机制之间的机制联系。
UPF1 is an RNA helicase that orchestrates nonsense-mediated decay and other RNA surveillance pathways. While UPF1 is best known for its basal cytoprotective role in degrading aberrant RNAs, UPF1 also degrades specific normally occurring mRNAs to regulate diverse cellular processes. Here, we describe a role for UPF1 in regulated protein decay, wherein UPF1 acts as an E3 ubiquitin ligase to repress human skeletal muscle differentiation. Suppressing UPF1 accelerates myogenesis, while ectopically increasing UPF1 levels slows myogenesis. UPF1 promotes the decay of MYOD protein, a transcription factor that is a master regulator of myogenesis, while leaving MYOD mRNA stability unaffected. UPF1 acts as an E3 ligase via its RING domain to promote MYOD protein ubiquitination and degradation. Our data characterize a regulatory role for UPF1 in myogenesis and demonstrate that UPF1 provides a mechanistic link between the RNA and protein decay machineries in human cells.
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