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A novel ubiquitin-binding protein ZNF216 functioning in muscle atrophy.


ABSTRACT: The ubiquitin-proteasome system (UPS) is critical for specific degradation of cellular proteins and plays a pivotal role on protein breakdown in muscle atrophy. Here, we show that ZNF216 directly binds polyubiquitin chains through its N-terminal A20-type zinc-finger domain and associates with the 26S proteasome. ZNF216 was colocalized with the aggresome, which contains ubiquitinylated proteins and other UPS components. Expression of Znf216 was increased in both denervation- and fasting-induced muscle atrophy and upregulated by expression of constitutively active FOXO, a master regulator of muscle atrophy. Mice deficient in Znf216 exhibited resistance to denervation-induced atrophy, and ubiquitinylated proteins markedly accumulated in neurectomized muscle compared to wild-type mice. These data suggest that ZNF216 functions in protein degradation via the UPS and plays a crucial role in muscle atrophy.

SUBMITTER: Hishiya A 

PROVIDER: S-EPMC1383529 | biostudies-literature | 2006 Feb

REPOSITORIES: biostudies-literature

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A novel ubiquitin-binding protein ZNF216 functioning in muscle atrophy.

Hishiya Akinori A   Iemura Shun-ichiro S   Natsume Tohru T   Takayama Shinichi S   Ikeda Kyoji K   Watanabe Ken K  

The EMBO journal 20060119 3


The ubiquitin-proteasome system (UPS) is critical for specific degradation of cellular proteins and plays a pivotal role on protein breakdown in muscle atrophy. Here, we show that ZNF216 directly binds polyubiquitin chains through its N-terminal A20-type zinc-finger domain and associates with the 26S proteasome. ZNF216 was colocalized with the aggresome, which contains ubiquitinylated proteins and other UPS components. Expression of Znf216 was increased in both denervation- and fasting-induced m  ...[more]

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