Specific recognition of linear polyubiquitin by A20 zinc finger 7 is involved in NF-κB regulation

Fuminori Tokunaga, Hiroshi Nishimasu, Ryuichiro Ishitani, Eiji Goto, Takuya Noguchi, Kazuhiro Mio, Kiyoko Kamei, Averil Ma, Kazuhiro Iwai, Osamu Nureki

研究成果: Article査読

158 被引用数 (Scopus)

抄録

LUBAC (linear ubiquitin chain assembly complex) activates the canonical NF-κB pathway through linear polyubiquitination of NEMO (NF-κB essential modulator, also known as IKKγ) and RIP1. However, the regulatory mechanism of LUBAC-mediated NF-κB activation remains elusive. Here, we show that A20 suppresses LUBAC-mediated NF-κB activation by binding linear polyubiquitin via the C-terminal seventh zinc finger (ZF7), whereas CYLD suppresses it through deubiquitinase (DUB) activity. We determined the crystal structures of A20 ZF7 in complex with linear diubiquitin at 1.70-1.98? €‰Å resolutions. The crystal structures revealed that A20 ZF7 simultaneously recognizes the Met1-linked proximal and distal ubiquitins, and that genetic mutations associated with B cell lymphomas map to the ubiquitin-binding sites. Our functional analysis indicated that the binding of A20 ZF7 to linear polyubiquitin contributes to the recruitment of A20 into a TNF receptor (TNFR) signalling complex containing LUBAC and IκB kinase (IKK), which results in NF-κB suppression. These findings provide new insight into the regulation of immune and inflammatory responses.

本文言語English
ページ(範囲)3856-3870
ページ数15
ジャーナルEMBO Journal
31
19
DOI
出版ステータスPublished - 2012 10月 3
外部発表はい

ASJC Scopus subject areas

  • 神経科学(全般)
  • 分子生物学
  • 生化学、遺伝学、分子生物学(全般)
  • 免疫学および微生物学(全般)

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