Zinc pyrithione is a potent inhibitor of PL^Pro and cathepsin L enzymes with ex vivo inhibition of SARS-CoV-2 entry and replication

Abstract

As SARS-CoV-2 triggered a global health crisis, there is an urgent need to provide patients with safe, effective, accessible, and preferably oral therapeutics for COVID-19 that complement mRNA vaccines. Zinc compounds are widely known for their antiviral properties. Therefore, we have prepared a library of zinc complexes with pyrithione (1-hydroxy-2(1H)-pyridinethione) and its analogues, all of which showed promising in vitro inhibition of cathepsin L, an enzyme involved in SARS-CoV-2 entry, and PLPro, an enzyme involved in SARS-CoV-2 replication both in (sub)micromolar range. Zinc pyrithione 1a is a well-established, commercially available antimicrobial agent and was therefore selected for further evaluation of its SARS-CoV-2 entry and replication inhibition in an ex vivo system derived from primary human lung tissue. Our results suggest that zinc pyrithione complex 1a provides a multitarget approach to combat SARS-CoV-2 and should be considered for repurposing as a potential therapeutic against the insidious COVID-19 disease.Featured imageIn our study, we show that zinc pyrithione holds immense potential for the development of a possible out-patient treatment for SARS-CoV-2 due to its inhibition of viral entry and replication.

Zinc pyrithione is a potent inhibitor of PLPro and cathepsin L enzymes with ex vivo inhibition of SARS-CoV-2 entry and replication

“…Since zinc pyrithione 1a is already an established antimicrobial agent commercially available, further research activities for possible repurposing of this zinc-containing agent for oral at-home SARS-CoV-2 patient treatment might be accelerated in the direction for potential clinical use. 80 …”