Gliotoxin suppresses NF-κB activation by selectively inhibiting linear ubiquitin chain assembly complex (LUBAC)

Hiroki Sakamoto, Shinichiro Egashira, Nae Saito, Takayoshi Kirisako, Simon Miller, Yoshiteru Sasaki, Tadahiko Matsumoto, Manabu Shimonishi, Toru Komatsu, Takuya Terai, Tasuku Ueno, Kenjiro Hanaoka, Hirotatsu Kojima, Takayoshi Okabe, Soichi Wakatsuki, Kazuhiro Iwai, Tetsuo Nagano

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)

Abstract

A linear ubiquitin chain, which consists of ubiquitin molecules linked via their N- and C-termini, is formed by a linear ubiquitin chain assembly complex (LUBAC) composed of HOIP, HOIL-1L, and SHARPIN, and conjugation of a linear ubiquitin chain on the NF-κB essential modulator (NEMO) is deeply involved in NF-κB activation induced by various signals. Since abnormal activation of NF-κB is associated with inflammatory disease and malignancy, we searched for an inhibitor of LUBAC by high-throughput screening (HTS) with a Tb3+-fluorescein FRET system. As a result, we found that the fungal metabolite gliotoxin inhibits LUBAC selectively by binding to the RING-IBR-RING domain of HOIP, the catalytic center of LUBAC. Gliotoxin has been well-known as an inhibitor of NF-κB activation, though its action mechanism has remained elusive. Here, we show that gliotoxin inhibits signal-induced NF-κB activation by selectively inhibiting LUBAC-mediated linear ubiquitin chain formation.

Original languageEnglish
Pages (from-to)675-681
Number of pages7
JournalACS chemical biology
Volume10
Issue number3
DOIs
Publication statusPublished - 2015 Mar 20
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Medicine

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