The Ubiquitin Proteasome System and Muscle Development

The Ubiquitin Proteasome System and Muscle Development
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泛素蛋白酶体系统和肌肉发育

DOI:
10.1002/9783527620227.ch2
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发表时间:
2006
期刊:
影响因子:
--
通讯作者:
Hoppe T.
Hoppe T.
中科院分区:
--
文献类型:
--
作者:
Kim J.;Hoppe T.

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多年来,肌肉蛋白质周转一直是一个深入研究的领域,这导致了参与这一过程的几个因素的发现。骨骼肌蛋白的降解可通过至少四种不同的蛋白降解机制发生:通过溶酶体 [1]、通过钙蛋白酶 [2]、通过半胱天冬酶或凋亡蛋白酶系统 [3]、[4],但最重要的是通过泛素蛋白酶体系统 (UPS)[5]。 UPS 参与肌肉组织的过程数量强调了蛋​​白质泛素化作为调节机制的多功能性。需要选择性蛋白质破坏来(1)确保肌肉的发育,(2)调节肌节(肌原纤维装置的主要组成部分)的维护和重塑,以及(3)介导肌节结构的破坏。 UPS 错综复杂地参与决定调节肌肉蛋白质合成和分解的细胞内信号通路之间的微妙平衡。在本章中,我们回顾了 UPS 在肌肉发育中的参与以及泛素连接酶对维持和组织肌肉丝结构的影响。然后我们讨论最近发现的在生理和病理生理条件下影响肌肉稳态的 UPS 相关因素。
Muscle protein turnover has been a field of intense research for many years, which has led to the discovery of several factors involved in this process. Degradation of skeletal muscle proteins can occur through at least four different protein degradation mechanisms: through the lysosome [1], by calpain proteases [2], through the caspase or apoptotic protease system [3],[4] but most prominently through the ubiquitin proteasome system (UPS)[5]. The versatility of protein ubiquitination as a regulatory mechanism is underlined by the number of processes in which the UPS is involved in muscle tissue. Selective protein destruction is required to (1) ensure the development of muscle,(2) regulate the maintenance and remodelling of the sarcomere, the major component of the myofibrillar apparatus and (3) to mediate the destruction of the sarcomeric structure. The UPS is intricately involved in dictating the delicate balance between intracellular signalling pathways that regulate muscle protein synthesis and breakdown. In this chapter we review the involvement of the UPS in muscle development and the implications of ubiquitin ligases that maintain and organize muscle filament structures. We then discuss recently identified UPS-associated factors that influence the homeostasis of muscle during physiological and pathophysiological conditions.
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