構造と変異は,KSHVの複製に不可欠なカプシドタンパク質の相互作用を明らかにする
Xinghong Dai1,2,3, Danyang Gong3, Hanyoung Lim1
1Department of Microbiology, Immunology and Molecular Genetics, University of California, Los Angeles (UCLA), Los Angeles, California 90095, USA.
Nature
|January 18, 2018
まとめ
カポシのサルコマ関連ヘルペスウイルス (KSHV) のカプシドの原子構造を決定し 重要なタンパク質の相互作用を明らかにしました この発見は,KSHVの抗ウイルス治療の開発に新しいターゲットを提供します.
科学分野:
- 構造生物学
- ウイルス学
- 生物化学
背景:
- カポシ・サルコマ関連ヘルペスウイルス (KSHV) は,エイズ患者やサハラ以南のアフリカで多く見られるガンであるカポシ・サルコマを引き起こす.
- ヘルペスウイルスのカプシドは 巨大で複雑な構造で DNAゲノムからの高圧で 抗ウイルス開発に挑戦的な標的になっています
- カプシドの組み立てとゲノム包装を理解することは,ヘルペスウイルスの複製をターゲットにするために不可欠です.
研究 の 目的:
- KSHVカプシドの高解像度原子構造を決定する.
- カプシドの安定性と組み立てに伴う分子相互作用をマッピングする.
- 抗ウイルス薬の開発のための潜在的な標的を特定する.
主な方法:
- クリオ電子顕微鏡 (cryo-EM) で電子を数えることで4. 2 Åの解像度が得られる.
- メジャーカプシドタンパク質 (MCP),最小カプシドタンパク質 (SCP),トリプレックスタンパク質 (Tri1,Tri2) を含むKSHVカプシドの原子モデル構築.
- 特定されたタンパク質の相互作用部位の機能的役割を検証する変異性研究.
主要な成果:
- KSHVカプシドの詳細な原子モデルが生成され,46のユニークなタンパク質コンフォマーが明らかになった.
- MCPの重要な溝が特定され,SCPとの相互作用を介し,カプシド構造を安定させました.
- 積み重ねられたヘアピン,二硫化結合,N-ラッソ/二酸化領域を含むMCPサブユニット間の複数の相互作用インターフェースは,カプシドの堅固さに寄与する.
- トリプレックスタンパク質 (Tri1/Tri2) はカプシドの床を固定し,穴を塞ぎ,Tri1 N-アンカー相互作用によって構造を強化することが示された.
- ミュタゲネシスは,MCP N- ラッソとTri1 N- アンカードメインの重要な役割を確認した.
結論:
- 高解像度のKSHVカプシド構造は,カプシドの完全性にとって不可欠な複雑なタンパク質相互作用を明らかにします.
- 特定された相互作用ホットスポットは,特にMCPとSCPが関与し,構造主導の抗ウイルス薬の設計のための基礎を提供します.
- SCPを模倣したポリペプチドは,KSHVのリティック複製を阻害する可能性を実証し,治療戦略を検証した.
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