SARS-CoV-2のRNA依存RNAポリメラーゼにおけるFe-S共因子は,潜在的な抗ウイルス標的である
Nunziata Maio1, Bernard A P Lafont2, Debangsu Sil3
1Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892, USA.
まとめ
研究者らは,ウイルスの複製に不可欠なSARS-CoV-2のRNA依存RNAポリメラーゼ (RdRp) で鉄硫黄のクラスターを発見した. これらのクラスタをTEMPOLで抑制することで,COVID-19ウイルスの複製を阻止し,新たな治療標的を明らかにした.
科学分野:
- ウイルス学
- 構造生物学
- 薬物の発見
背景:
- 重症急性呼吸器症候群コロナウイルス2型 (SARS-CoV-2型) は,遺伝子複製および遺伝子転写のためにRNA依存性RNAポリメラーゼ (RdRp) を利用する.
- 以前の構造モデルは,RdRp複合体内の亜鉛センターを示唆した.
研究 の 目的:
- SARS-CoV-2 RdRp触媒サブユニット (nsp12) の金属共因子の性質を調査する.
- COVID-19の治療目標としてこれらのコファクターの可能性を調査する.
主な方法:
- nsp12における金属結合部位をモデル化するために,冷凍電子顕微鏡データを利用した.
- 安定したニトロキシドTEMPOLを使用し, 確認された鉄硫黄のクラスタを酸化し,分解します.
- 細胞培養におけるRdRp活動とSARS-CoV-2複製に対するクラスター分解の影響を評価した.
主要な成果:
- 以前モデル化された亜鉛センターとは異なるnsp12サブユニットによって結合された2つの重要な鉄硫黄金属共因子を特定した.
- これらの鉄硫黄のクラスターの酸化と分解が RdRpの活性を強力に抑制することを示した.
- TEMPOLによるクラスター解体が,細胞培養におけるSARS-CoV-2の複製を効果的に阻害したことを示した.
結論:
- 鉄と硫黄のクラスターは,SARS-CoV-2 RdRp機能とウイルスの複製に不可欠なコファクターである.
- これらの鉄硫黄のクラスターは,新しいCOVID-19治療の開発のための有望な治療目標を表しています.
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