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Maturation mechanism of severe acute respiratory syndrome (SARS) coronavirus 3C-like proteinase.

ABSTRACT: The 3C-like proteinase (3CL(pro)) of the severe acute respiratory syndrome (SARS) coronavirus plays a vital role in virus maturation and is proposed to be a key target for drug design against SARS. Various in vitro studies revealed that only the dimer of the matured 3CL(pro) is active. However, as the internally encoded 3CL(pro) gets matured from the replicase polyprotein by autolytic cleavage at both the N-terminal and the C-terminal flanking sites, it is unclear whether the polyprotein also needs to dimerize first for its autocleavage reaction. We constructed a large protein containing the cyan fluorescent protein (C), the N-terminal flanking substrate peptide of SARS 3CL(pro) (XX), SARS 3CL(pro) (3CLP), and the yellow fluorescent protein (Y) to study the autoprocessing of 3CL(pro) using fluorescence resonance energy transfer. In contrast to the matured 3CL(pro), the polyprotein, as well as the one-step digested product, 3CLP-Y-His, were shown to be monomeric in gel filtration and analytic ultracentrifuge analysis. However, dimers can still be induced and detected when incubating these large proteins with a substrate analog compound in both chemical cross-linking experiments and analytic ultracentrifuge analysis. We also measured enzyme activity under different enzyme concentrations and found a clear tendency of substrate-induced dimer formation. Based on these discoveries, we conclude that substrate-induced dimerization is essential for the activity of SARS-3CL(pro) in the polyprotein, and a modified model for the 3CL(pro) maturation process was proposed. As many viral proteases undergo a similar maturation process, this model might be generally applicable.

SUBMITTER: Li C

PROVIDER: S-EPMC2934678 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Project description:The Severe Acute Respiratory Syndrome 2 (SARS-CoV-2) is an infectious virus that causes mild to severe life-threatening upper respiratory tract infection. The virus emerged in Wuhan, China in 2019, and later spread across the globe. Its genome has been completely sequenced and based on the genomic information, the virus possessed 3C-Like Main Protease (3CLpro), an essential multifunctional enzyme that plays a vital role in the replication and transcription of the virus by cleaving polyprotein at eleven various sites to produce different non-structural proteins. This makes the protein an important target for drug design and discovery. Herein, we analyzed the interaction between the 3CLpro and potential inhibitory compounds identified from the extracts of Zingiber offinale and Anacardium occidentale using in silico docking and Molecular Dynamics (MD) Simulation. The crystal structure of SARS-CoV-2 main protease in complex with 02J (5-Methylisoxazole-3-carboxylic acid) and PEJ (composite ligand) (PDB Code: 6LU7, 2.16 Å) retrieved from Protein Data Bank (PDB) and subject to structure optimization and energy minimization. A total of twenty-nine compounds were obtained from the extracts of Z. offinale and the leaves of A. occidentale. These compounds were screened for physicochemical (Lipinski rule of five, Veber rule, and Egan filter), Pan-Assay Interference Structure, and pharmacokinetic properties to determine the Pharmaceutical Active Ingredients. Of the 29 compounds, only nineteen (19) possessed drug-likeness properties with efficient oral bioavailability and less toxicity. These compounds subjected to molecular docking analysis to determine their binding energies with the 3CLpro. The result of the analysis indicated that the free binding energies of the compounds ranged between ??5.08 and ??10.24 kcal/mol, better than the binding energies of 02j (??4.10 kcal/mol) and PJE (??5.07 kcal/mol). Six compounds (CID_99615?=???10.24 kcal/mol, CID_3981360?=?9.75 kcal/mol, CID_9910474?=???9.14 kcal/mol, CID_11697907?=???9.10 kcal/mol, CID_10503282?=???9.09 kcal/mol and CID_620012?=???8.53 kcal/mol) with good binding energies further selected and subjected to MD Simulation to determine the stability of the protein–ligand complex. The results of the analysis indicated that all the ligands form stable complexes with the protein, although, CID_9910474 and CID_10503282 had a better stability when compared to other selected phytochemicals (CID_99615, CID_3981360, CID_620012, and CID_11697907).

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Maturation mechanism of severe acute respiratory syndrome (SARS) coronavirus 3C-like proteinase.

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