SARS hCoV papain-like protease is a unique Lys48 linkage-specific di-distributive deubiquitinating enzyme

The Biochemical Journal
Miklos BekesTony T Huang

Abstract

Ubiquitin (Ub) and the Ub-like (Ubl) modifier interferon-stimulated gene 15 (ISG15) participate in the host defence of viral infections. Viruses, including the severe acute respiratory syndrome human coronavirus (SARS hCoV), have co-opted Ub-ISG15 conjugation pathways for their own advantage or have evolved effector proteins to counter pro-inflammatory properties of Ub-ISG15-conjugated host proteins. In the present study, we compare substrate specificities of the papain-like protease (PLpro) from the recently emerged Middle East respiratory syndrome (MERS) hCoV to the related protease from SARS, SARS PLpro. Through biochemical assays, we show that, similar to SARS PLpro, MERS PLpro is both a deubiquitinating (DUB) and a deISGylating enzyme. Further analysis of the intrinsic DUB activity of these viral proteases revealed unique differences between the recognition and cleavage specificities of polyUb chains. First, MERS PLpro shows broad linkage specificity for the cleavage of polyUb chains, whereas SARS PLpro prefers to cleave Lys48-linked polyUb chains. Secondly, MERS PLpro cleaves polyUb chains in a 'mono-distributive' manner (one Ub at a time) and SARS PLpro prefers to cleave Lys48-linked polyUb chains by sensing a di-Ub moie...Continue Reading

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