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Analysis of Structures of SARS-CoV-2 Papain-like Protease Bound with Ligands Unveils Structural Features for Inhibiting the Enzyme
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Analysis of Structures of SARS-CoV-2 Papain-like Protease Bound with Ligands Unveils Structural Features for Inhibiting the Enzyme
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Journal Article
Analysis of Structures of SARS-CoV-2 Papain-like Protease Bound with Ligands Unveils Structural Features for Inhibiting the Enzyme
2025
Overview
The COVID-19 pandemic, driven by the novel coronavirus SARS-CoV-2, has drastically reshaped global health and socioeconomic landscapes. The papain-like protease (PLpro) plays a critical role in viral polyprotein cleavage and immune evasion, making it a prime target for therapeutic intervention. Numerous compounds have been identified as inhibitors of SARS-CoV-2 PLpro, with many characterized through crystallographic studies. To date, over 70 three-dimensional (3D) structures of PLpro complexed ligands have been deposited in the Protein Data Bank, offering valuable insight into ligand-binding features that could aid the discovery and development of effective COVID-19 treatments targeting PLpro. In this study, we reviewed and analyzed these 3D structures, focusing on the key residues involved in ligand interactions. Our analysis revealed that most inhibitors bind to PLpro’s substrate recognition sites S3/S4 and SUb2. While these sites are highly attractive and have been extensively explored, other potential binding regions, such as SUb1 and the Zn(II) domain, are less explored and may hold untapped potential for future COVID-19 drug discovery and development. Our structural analysis provides insights into the molecular features of PLpro that could accelerate the development of novel therapeutics targeting this essential viral enzyme.
Publisher
MDPI AG,MDPI
Subject
/ Analysis
/ Antiviral Agents - chemistry
/ Antiviral Agents - pharmacology
/ Coronavirus 3C Proteases - antagonists & inhibitors
/ Coronavirus 3C Proteases - chemistry
/ Coronavirus 3C Proteases - metabolism
/ Coronavirus Papain-Like Proteases - antagonists & inhibitors
/ Coronavirus Papain-Like Proteases - chemistry
/ Coronavirus Papain-Like Proteases - metabolism
/ COVID-19
/ Enzymes
/ Genomes
/ Humans
/ Ligands
/ Middle East respiratory syndrome
/ Papain
/ Peptides
/ PLpro
/ Protease Inhibitors - chemistry
/ Protease Inhibitors - pharmacology
/ Proteins
/ Review
/ Severe acute respiratory syndrome coronavirus 2
/ Viruses
