The 3CLpro of TGEV and FIPV are highly conserved with the amino acid sequence identity of >93%. S2A Fig shows the superimposed 3CLpro structures of MERS-CoV (PDB ID: 4WME, teal) and FIPV (red) modelled based on TGEV 3CLpro (PDB ID: 4F49).
Coronavirus 3CLpro are highly conserved in their structure and the active site. Thus, the present study models potential Zn binding to RdRp and. Zn also has a history of use in viral infection control. Zinc (Zn) has strong immunogenic properties and is known to bind to a number of proteins, modulating their activities. RNA‑dependent RNA‑polymerase (RdRp) and 3C‑like proteinase (3CLpro) are two main enzymes that play a key role in the replication of SARS‑CoV‑2. The enzyme activity of the hybrid severe acute respiratory syndrome coronavirus 3C-like protease of the wild-type protein and the inactive mutant proves that the dimerization is important for enzyme activity and only one active protomer in the dimer is enough for the catalysis. AUC studies support that MERS-CoV 3CLpro is a weakly associated dimer (Kd ~52 μM) with a slow off-rate. Conversely, HKU4, HKU5 and SARS-CoV 3CLpro enzymes are tightly associated dimers. 
Not only is there a shortage of commercial anti-PEDV drugs, but available commercial vaccines fail to protect against highly virulent PEDV variants. There is an urgent need to find new therapeutic methods to prevent and control PEDV. Porcine epidemic diarrhea virus (PEDV) causes lethal diarrhea in suckling piglets, leading to severe economic losses worldwide.Anglo-Chinese School(Independent), Singapore. and Isatis Indigotica Root, on 3CLpro from SARS-CoV-2 Using Both Cell-based and Cell-free Assay Models. A Comparative Study of the Inhibitory Effects of Rheum palmatum L.
In the present work, 9101 drugs obtained from the drug bank database were screened against SARS-CoV-2 3CLpro prosing deep learning, molecular docking, and molecular dynamics simulation techniques.
Blocking the main replicating enzyme, 3 Chymotrypsin-like protease (3CLpro) is the most promising drug development strategy against the SARS-CoV-2 virus, responsible for the current COVID-19 pandemic.
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