Structural and mutational analysis of the interaction between the Middle-East respiratory syndrome coronavirus (MERS-CoV) papain-like protease and human ubiquitin

Jian Lei, Rolf Hilgenfeld*

*Corresponding author for this work
8 Citations (Scopus)

Abstract

The papain-like protease (PLpro) of Middle-East respiratory syndrome coronavirus (MERS-CoV) has proteolytic, deubiquitinating, and deISGylating activities. The latter two are involved in the suppression of the antiviral innate immune response of the host cell. To contribute to an understanding of this process, we present here the X-ray crystal structure of a complex between MERS-CoV PLpro and human ubiquitin (Ub) that is devoid of any covalent linkage between the two proteins. Five regions of the PLpro bind to two areas of the Ub. The C-terminal five residues of Ub, RLRGG, are similar to the P5–P1 residues of the polyprotein substrates of the PLpro and are responsible for the major part of the interaction between the two macromolecules. Through sitedirected mutagenesis, we demonstrate that conserved Asp165 and non-conserved Asp164 are important for the catalytic activities of MERS-CoV PLpro. The enzyme appears not to be optimized for catalytic efficiency; thus, replacement of Phe269 by Tyr leads to increased peptidolytic and deubiquitinating activities. Ubiquitin binding by MERS-CoV PLpro involves remarkable differences compared to the corresponding complex with SARS-CoV PLpro. The structure and the mutational study help understand common and unique features of the deubiquitinating activity of MERS-CoV PLpro. [Figure not available: see fulltext.]

Original languageEnglish
JournalVirologica Sinica
Volume31
Issue number4
Pages (from-to)288-299
Number of pages12
ISSN1674-0769
DOIs
Publication statusPublished - 01.08.2016

Research Areas and Centers

  • Academic Focus: Center for Infection and Inflammation Research (ZIEL)

Coronavirus related work

  • Research on SARS-CoV-2 / COVID-19

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