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6-Thioguanine blocks SARS-CoV-2 replication by inhibition of PLpro protease activities.


ABSTRACT: A recently emerged betacoronavirus, SARS-CoV-2, has led to a global health crisis that calls for the identification of effective therapeutics for COVID-19 disease. Coronavirus papain-like protease (PLpro) is an attractive drug target as it is essential for viral polyprotein cleavage and for deconjugation of ISG15, an antiviral ubiquitin-like protein. We show here that 6-Thioguanine (6-TG) inhibits SARS-CoV-2 PLpro-catalyzed viral polyprotein cleavage and ISG15 deconjugation in cells and inhibits replication of SARS-CoV-2 in Vero-E6 cells and Calu3 cells at submicromolar levels. As a well-characterized FDA-approved orally delivered drug, 6-TG represents a promising therapeutic for COVID-19 and other emerging coronaviruses. One Sentence Summary:A repurposed drug that targets an essential enzymatic activity of SARS-CoV-2 represents a promising COVID-19 therapeutic.

SUBMITTER: Swaim CD 

PROVIDER: S-EPMC7337375 | biostudies-literature | 2020 Jul

REPOSITORIES: biostudies-literature

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6-Thioguanine blocks SARS-CoV-2 replication by inhibition of PLpro protease activities.

Swaim Caleb D CD   Perng Yi-Chieh YC   Zhao Xu X   Canadeo Larissa A LA   Harastani Houda H HH   Darling Tamarand L TL   Boon Adrianus C M ACM   Lenschow Deborah J DJ   Huibregtse Jon M JM  

bioRxiv : the preprint server for biology 20200702


A recently emerged betacoronavirus, SARS-CoV-2, has led to a global health crisis that calls for the identification of effective therapeutics for COVID-19 disease. Coronavirus papain-like protease (PLpro) is an attractive drug target as it is essential for viral polyprotein cleavage and for deconjugation of ISG15, an antiviral ubiquitin-like protein. We show here that 6-Thioguanine (6-TG) inhibits SARS-CoV-2 PLpro-catalyzed viral polyprotein cleavage and ISG15 deconjugation in cells and inhibits  ...[more]

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