6BI8

X-ray structure of MERS coronavirus papain-like protease in complex with human ISG15

6BI8 の概要

• エントリーDOI: 10.2210/pdb6bi8/pdb
• 分子名称: ORF1a, Ubiquitin-like protein ISG15, TRIETHYLENE GLYCOL, ... (9 entities in total)
• 機能のキーワード: complex, signaling protein, deisgylase, hydrolase, hydrolase-substrate complex, hydrolase/substrate
• 由来する生物種: Human betacoronavirus 2c EMC/2012; 詳細
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 93570.69

構造登録者

Clasman, J.C.,Mesecar, A.D. (登録日: 2017-11-01, 公開日: 2018-11-07, 最終更新日: 2023-10-04)

主引用文献

Clasman, J.R.,Everett, R.K.,Srinivasan, K.,Mesecar, A.D.
Decoupling deISGylating and deubiquitinating activities of the MERS virus papain-like protease.
Antiviral Res., 174:104661-104661, 2020

PubMed Abstract: Coronavirus papain-like proteases (PLPs or PLpro), such as the one encoded in the genome of the infectious Middle East Respiratory Syndrome (MERS) virus, have multiple enzymatic activities that promote viral infection. PLpro acts as a protease and processes the large coronavirus polyprotein for virus replication. PLpro also functions as both a deubiquitinating (DUB) and deISGylating (deISG) enzyme and removes ubiquitin (Ub) and interferon-stimulated gene 15 (ISG15) from cellular proteins. Both DUB and deISG activities are implicated in suppressing innate immune responses; however, the precise role of each activity in this process is still unclear due in part to the difficulties in separating each activity. In this study, we determine the first structure of MERS PLpro in complex with the full-length human ISG15 to a resolution of 2.3 Å. This structure and available structures of MERS PLpro-Ub complexes were used as molecular guides to design PLpro mutants that lack either or both DUB/deISG activities. We tested 13 different PLpro mutants for protease, DUB, and deISG activitites using fluorescence-based assays. Results show that we can selectively modulate DUB activity at amino acid positions 1649 and 1653 while mutation of Val1691 or His1652 of PLpro to a positive charged residue completely impairs both DUB/deISG activities. These mutant enzymes will provide new functional tools for delineating the importance of DUB versus deISG activity in virus-infected cells and may serve as potential candidates for attenuating the MERS virus in vivo for modified vaccine design efforts.

PubMed: 31765674
DOI: 10.1016/j.antiviral.2019.104661

実験手法

X-RAY DIFFRACTION (2.291 Å)