Identification of the MuRF1 Skeletal Muscle Ubiquitylome Through Quantitative Proteomics.

Identification of the MuRF1 Skeletal Muscle Ubiquitylome Through Quantitative Proteomics.
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DOI:
10.1093/function/zqab029
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发表时间:
2021
期刊:
Function (Oxford, England)
影响因子:
--
通讯作者:
Bodine SC
Bodine SC
中科院分区:
其他
文献类型:
--
作者:
Baehr LM;Hughes DC;Lynch SA;Van Haver D;Maia TM;Marshall AG;Radoshevich L;Impens F;Waddell DS;Bodine SC

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MuRF1(TRIM63)是一种肌肉特异性E3泛素连接酶,也是泛素蛋白酶体系统的组成部分。在啮齿动物和人类中,MuRF1在导致肌肉损失的条件下转录上调,并且是肌肉萎缩的公认标志物。在这项研究中,我们使用体内电穿孔,以确定是否MuRF1过表达单独会导致肌肉萎缩,并结合泛素蛋白质组学,确定内源性MuRF1底物在骨骼肌。MuRF1在成年小鼠中的过表达增加了肌原纤维和肌浆蛋白的泛素化,增加了与神经肌肉接头不稳定相关的基因的表达,并导致肌肉萎缩。在56个蛋白质上共有169个泛素化位点被发现受到MuRF1的调控。MuRF1介导的泛素化靶向粗丝和细丝收缩蛋白,以及糖酵解酶、去泛素化酶、p62和VCP。这些数据揭示了MuRF1不仅在肌节的分解中,而且在骨骼肌中的代谢和其他蛋白水解途径的调节中的潜在作用。
MuRF1 (TRIM63) is a muscle-specific E3 ubiquitin ligase and component of the ubiquitin proteasome system. MuRF1 is transcriptionally upregulated under conditions that cause muscle loss, in both rodents and humans, and is a recognized marker of muscle atrophy. In this study, we used in vivo electroporation to determine whether MuRF1 overexpression alone can cause muscle atrophy and, in combination with ubiquitin proteomics, identify the endogenous MuRF1 substrates in skeletal muscle. Overexpression of MuRF1 in adult mice increases ubiquitination of myofibrillar and sarcoplasmic proteins, increases expression of genes associated with neuromuscular junction instability, and causes muscle atrophy. A total of 169 ubiquitination sites on 56 proteins were found to be regulated by MuRF1. MuRF1-mediated ubiquitination targeted both thick and thin filament contractile proteins, as well as, glycolytic enzymes, deubiquitinases, p62, and VCP. These data reveal a potential role for MuRF1 in not only the breakdown of the sarcomere but also the regulation of metabolism and other proteolytic pathways in skeletal muscle.
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