BRISC-SHMT2アセンブリの代謝制御は免疫信号を調節する
Miriam Walden1, Lei Tian2, Rebecca L Ross3
1Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Leeds, UK.
Nature
|May 31, 2019
まとめ
代謝物質は炎症信号を調節する この研究では,非活性なセリンヒドロキシメチルトランスフェラーゼ2 (SHMT2) ダイマーがBRCC36イソペプチダゼ複合体 (BRISC) を抑制し,サイトカイン応答とI型インターフェロンシグナル伝達に影響を及ぼすことが明らかになりました.
科学分野:
- 生物化学
- 分子生物学
- 免疫学
背景:
- セリンヒドロキシメチルトランスフェラーゼ2 (SHMT2) は,ピリドクサル-5'- リン酸 (PLP) をコファクターとして利用して,一炭素代謝に不可欠です.
- SHMT2の二重形は不活性であり,PLP結合は活性四重形状態を安定させる.
- SHMT2はBRCC36イソペプチダース複合体 (BRISC) と相互作用し,炎症性サイトカインシグナル伝達に影響を与えますが,そのメカニズムは不明です.
研究 の 目的:
- BRISC-SHMT2の相互作用の構造的基礎を明らかにする.
- SHMT2がBRISCの活動と炎症シグナル伝達をどのように調節するかを理解する.
- この相互作用と下流信号の調節におけるPLPの役割を調査する.
主な方法:
- ヒトのBRISC-SHMT2複合体の構造を決定するための冷凍電子顕微鏡 (冷凍-EM)
- デウビキティラーゼ活性抑制を評価するための生化学的測定.
- BRISCへのSHMT2結合を阻害するサイト指向型変異.
- 炎症的刺激に対するタイプIインターフェロン信号の分析
主要な成果:
- 凍結EM構造は,SHMT2がBRCC36活性部位を固体的に遮断し,デウビキチラーゼの活性を抑制することを明らかにした.
- 非活性SHMT2ジマーのみで,PLP結合テトラメルはBRISCと結合し抑制する.
- BRISC- SHMT2結合を阻害する変異は,タイプIインターフェロンシグナル伝達を阻害する.
- 細胞内PLPレベルはBRISC- SHMT2相互作用と炎症反応を調節することが示された.
結論:
- SHMT2は,ステリック阻害によってBRISCデウビキチラゼの活性を直接抑制する.
- メタボライトレベル (PLP) は,SHMT- BRISCの相互作用を動的に調節し,炎症信号を制御する.
- この研究は,代謝状態と,代謝物質制御された酵素抑制による免疫反応の調節を結びつける新しいメカニズムを発見した.
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