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SARS-CoV-2受容体結合領域の深層変異スキャンは,折り畳みとACE2結合の制限を明らかにする
Tyler N Starr1, Allison J Greaney2, Sarah K Hilton3
1Basic Sciences Division and Computational Biology Program, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA.
Cell
|August 26, 2020
まとめ
SARS-CoV-2のスパイクタンパク質の受容体結合領域 (RBD) の変異が研究されました. ほとんどの変異はタンパク質発現とACE2結合を損なうが,まだパンデミック株で選択されていないが,それを強化する変異もある.
科学分野:
- ウイルス学
- 免疫学
- 構造生物学
背景:
- SARS-CoV-2 スパイクタンパク質の受容体結合領域 (RBD) は,ACE2受容体結合を通じてウイルスの侵入に不可欠である.
- RBDは抗体を中和する主な標的であり,宿主範囲に影響を与えます.
- RBDの機能に対する突然変異の影響を理解することは,治療およびワクチン開発に不可欠です.
研究 の 目的:
- SARS-CoV-2 RBDにおけるすべての可能なアミノ酸変異がタンパク質発現とACE2結合親和性に及ぼす影響を実験的に評価する.
- RBD内の機能と介入の潜在的なターゲットを決定する地域を特定する.
- 進行中のパンデミック中にACE2結合を強化する突然変異が選択されたかどうかを調査する.
主な方法:
- SARS-CoV-2 RBDの系統的な変異.
- 折りたたまれたタンパク質発現レベルの実験測定
- 人間のACE2受容体への結合 afinityを定量化するために測定します.
- バイオ情報分析とインタラクティブデータ可視化
主要な成果:
- ほとんどのアミノ酸変異はRBD発現とACE2結合に負の影響を及ぼします.
- RBDの表面上の特定の制限地域は,潜在的に脆弱なターゲットとして特定されました.
- SARSに関連するコロナウイルスに保存された残留物を含む,一部の変異はよく耐受されるか,ACE2結合を強化することが判明した.
- 現在のSARS-CoV-2パンデミック単離体におけるACE2親和性増強変異の選択に関する証拠は見つかりませんでした.
結論:
- ほとんどのRBD変異は有害で,ACE2結合の変化による免疫回避の進化経路が限られていることを示唆している.
- RBDに制限がある地域は,耐久性の高いワクチンと抗体療法のための有望な目標を示しています.
- データセットと分析パイプラインは,進行中のSARS-CoV-2の監視と治療設計に貴重なリソースを提供します.
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