STING ポリマー の 構造 は,活性化,過活性化,抑制 の 仕組み を 明らか に し て い ます
Sabrina L Ergun1, Daniel Fernandez2, Thomas M Weiss3
1Department of Biochemistry, Stanford School of Medicine, Stanford University, Stanford, CA 94305, USA.
Cell
|June 25, 2019
まとめ
インターフェロン遺伝子 (STING) タンパク質のSTシミュレータ
科学分野:
- 生まれつきの免疫
- 分子生物学
- 構造生物学
背景:
- インターフェロン遺伝子刺激器 (STING) のリガンドによる活性化の正確なメカニズムは完全に理解されていません.
- STINGは先天的な免疫系の中心的なタンパク質で,細胞塩基DNAを検出し,抗ウイルスおよび抗腫瘍反応を開始するのに不可欠です.
研究 の 目的:
- 異なるリガンドによるSTING活性化の原因となる構造的および生化学的メカニズムを解明する.
- STING変異が 過剰活性化や自己免疫状態に 繋がる原因を理解する
- サイクリック・ディヌクレオチドによるSTINGの微分活性化を探求する.
主な方法:
- 構造の決定のためのX線結晶学と冷凍電子顕微鏡.
- タンパク質とリガンドの相互作用とポリメリゼーションを研究する生化学的測定法.
- 特定の残留物や突然変異の役割を調査するサイト指向型変異.
主要な成果:
- 2'3'-cGAMP結合はSTINGホモディマー閉塞を誘導し,C端尾を解放し,ポリメリゼーションインターフェイスを露出する.
- システイン148の二硫化結合形成は,STINGのポリメリゼーションと活性化に不可欠である.
- 病気に関連した変異はC148またはC-端尾結合部位に集まって構成的活性化を引き起こします.
- バクテリアのサイクル-di-GMPは,別のSTING構成,協力的活性化を引き起こし,部分的に2'3'-cGAMPシグナル伝達を阻害する.
結論:
- この研究は,リガンド誘発の構造変化,C端尾の解離,およびポリメリゼーションを含むSTING活性化の詳細なメカニズムを明らかにしています.
- STINGの活性化経路と特定の変異の役割についての洞察は,自己免疫症候群を理解するための基礎を提供します.
- 周期性ダイヌクレオチドによる差分活性化は,先天的な免疫反応を制御する複雑な調節メカニズムを示唆し,治療の機会を提供します.
キーワード:
2′3′-cGAMPSAVIスティング幼児期に発症するSTING関連血管病TMEM173 についてcGAMPサイクリック・ディ・AMPサイクル・ディ・GMPサイクリック・ディヌクレオチド生まれつきの免疫さらに関連する動画
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