SHARPINは,NF-κBを活性化する線形ユビキチン鎖組立複合体の構成要素です
Fuminori Tokunaga1, Tomoko Nakagawa, Masaki Nakahara
1Department of Biophysics and Biochemistry, Graduate School of Medicine, Osaka University, Suita, Osaka 565-0871, Japan.
Nature
|April 2, 2011
まとめ
SHARPINは,NF-κB活性化に不可欠な線形ユビキチン鎖組立複合体 (LUBAC) の重要な構成要素として特定されています. この発見は,LUBAC機能障害に関連した免疫疾患に光を当てています.
科学分野:
- 免疫学 免疫学とは
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
背景:
- 慢性増殖性皮膚炎 (cpdm) のマウスは皮膚炎と免疫不全を示し,ヒトのX関連ハイパーIgM症候群を反映しています.
- シャーピン遺伝子の変異がcpdm現象型を引き起こし,SHARPINタンパク質はLUBAC成分に類似している.
研究 の 目的:
- 線形ユビキチン鎖組立複合体 (LUBAC) での SHARPIN の役割を特定する.
- LUBAC内のSHARPINの機能とそのNF-κB活性化への影響を解明する.
主な方法:
- SHARPINをLUBACの成分として特定するための生化学分析.
- マウスの胚性線維芽細胞とcpdmマウスのB細胞におけるNF-κB活性化の評価.
- SHARPINの消去がLUBACレベルとTNF-α/CD40媒介のNF-κBシグナル伝達に及ぼす影響を調査する.
主要な成果:
- SHARPINは,HOIL-1LとHOIPと共に,LUBACの不可欠な構成要素として確認されています.
- SHARPINを含む複合体は,NEMOと活性化されたNF-κBの線形ユビキチネーションを媒介する.
- SHARPIN欠乏症は,LUBACのレベルを大幅に低下させ,NF-κBの活性化を弱める.
結論:
- LUBACは,SHARPIN,HOIL-1L,HOIPを含む複合体として再定義されています.
- LUBACにおけるSHARPINの役割は,NF-κBの有効な活性化に不可欠である.
- LUBAC媒介のNF-κB活性化の調節不良は,様々な疾患に寄与する可能性がある.
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