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- W2028595956 abstract "Background The 3C-like protease (3CLpro) of severe acute respiratory syndrome-coronavirus is required for autoprocessing of the polyprotein, and is a potential target for treating coronaviral infection. Methodology/Principal Findings To obtain a thorough understanding of substrate specificity of the protease, a substrate library of 198 variants was created by performing saturation mutagenesis on the autocleavage sequence at P5 to P3' positions. The substrate sequences were inserted between cyan and yellow fluorescent proteins so that the cleavage rates were monitored by in vitro fluorescence resonance energy transfer. The relative cleavage rate for different substrate sequences was correlated with various structural properties. P5 and P3 positions prefer residues with high β-sheet propensity; P4 prefers small hydrophobic residues; P2 prefers hydrophobic residues without β-branch. Gln is the best residue at P1 position, but observable cleavage can be detected with His and Met substitutions. P1' position prefers small residues, while P2' and P3' positions have no strong preference on residue substitutions. Noteworthy, solvent exposed sites such as P5, P3 and P3' positions favour positively charged residues over negatively charged one, suggesting that electrostatic interactions may play a role in catalysis. A super-active substrate, which combined the preferred residues at P5 to P1 positions, was found to have 2.8 fold higher activity than the wild-type sequence. Conclusions/Significance Our results demonstrated a strong structure-activity relationship between the 3CLpro and its substrate. The substrate specificity profiled in this study may provide insights into a rational design of peptidomimetic inhibitors." @default.
- W2028595956 created "2016-06-24" @default.
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- W2028595956 date "2010-10-06" @default.
- W2028595956 modified "2023-10-13" @default.
- W2028595956 title "Profiling of Substrate Specificity of SARS-CoV 3CLpro" @default.
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- W2028595956 doi "https://doi.org/10.1371/journal.pone.0013197" @default.
- W2028595956 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2950840" @default.
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