Mxra8受容体との複合体におけるチクングンヤウイルスの冷凍-EM構造

Katherine Basore¹, Arthur S Kim², Christopher A Nelson¹

¹Department of Pathology & Immunology, Washington University School of Medicine, Saint Louis, MO 63110, USA.

Cell

|May 14, 2019

まとめ

Mxra8はチクングンヤウイルス (CHIKV) のようなアルファウイルスの受容体です. この研究では,Mxra8

科学分野:

構造生物学
ウイルス学
免疫学

背景:

Mxra8は,ヒトにおける重度の運動器系疾患の原因となるアルファウイルスの受容体として作用する.
Mxra8とチクングニャウイルス (CHIKV) のようなウイルスの相互作用を理解することは,治療戦略の開発に不可欠です.

研究の目的:

Mxra8とCHIKVの相互作用の構造的根拠を解明する.
Mxra8によるアルファウイルスの侵入メカニズムについての洞察を提供するためです.

主な方法:

Mxra8の高解像度構造を決定するために,X線結晶学を用いた.
低温電子顕微鏡 (cryo-EM) を用いて,Mxra8をCHIKVウイルス型粒子 (VLPs) と感染性CHIKVに結合させた.

主要な成果:

Mxra8の結晶構造は,そのIgのようなドメインのユニークなヘッドツーヘッドの配置を明らかにしました.
Mxra8は,異なる結合モードを利用して,ウイルススパイク内のE2-E1ヘテロジマーと相互作用することによって,CHIKVと結合する.
ウイルスの成熟とE3の占有は,感染性CHIKVのMxra8結合親和性と部位選択に影響する.

結論:

この研究は,Mxra8がCHIKVに結合する詳細な構造の洞察を提供します.
発見はアルファウイルスの侵入を標的とした新しい阻害剤の設計に道を開く.

キーワード:

HDX質量スペクトロメトリーアルファウイルスクリオ電子顕微鏡感染症タンパク質結晶学表面プラズモンの共鳴ウイルス受容体

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