Less is more: how protein degradation regulates muscle development.

T Hoppe
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引用次数: 2

Abstract

The organization of sarcomeric structures during muscle development involves regulated multistep assembly pathways. The myosin assembly factor UNC-45 functions both as a molecular chaperone and as an Hsp90 co-chaperone for myosin throughout muscle thick-filament formation. Consequently, mutations in unc-45 result in paralyzed worms with severe myofibril disorganization in striated body wall muscles. Our data suggest that functional muscle formation in Caenorhabditis elegans is linked to ubiquitin-dependent UNC-45 turnover, regulated by the E3 enzymes UFD-2 and CHN-1 in cooperation with the ubiquitin-selective chaperone CDC-48 (also known as p97 in human). Missense mutations in the gene encoding p97 are known to cause a dominant, late-onset hereditary inclusion body myopathy. Remarkably, we identified a conserved role of CDC-48/p97 in the process of myofiber differentiation and maintenance, which appears to have important implications for understanding defects in muscle formation and maintenance during pathological conditions.

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少即是多:蛋白质降解如何调节肌肉发育。
肌肉发育过程中肌体结构的组织涉及受调节的多步骤组装途径。肌凝蛋白组装因子UNC-45在整个肌肉粗丝形成过程中既作为分子伴侣又作为Hsp90共伴侣发挥作用。因此,unc-45的突变导致瘫痪的蠕虫在横纹肌壁肌肉中出现严重的肌原纤维紊乱。我们的数据表明,秀丽隐杆线虫的功能性肌肉形成与泛素依赖性的UNC-45转换有关,该转换由E3酶UFD-2和CHN-1与泛素选择性伴侣CDC-48(在人类中也称为p97)合作调节。编码p97基因的错义突变已知可导致显性晚发遗传性包涵体肌病。值得注意的是,我们发现了CDC-48/p97在肌纤维分化和维持过程中的保守作用,这似乎对理解病理状态下肌肉形成和维持缺陷具有重要意义。
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