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'''Crystal structure of SARS-CoV main protease with authentic N and C-termini''' | '''Crystal structure of SARS-CoV main protease with authentic N and C-termini''' | ||
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[[Category: Yang, H.]] | [[Category: Yang, H.]] | ||
[[Category: Zhao, Q.]] | [[Category: Zhao, Q.]] | ||
[[Category: | [[Category: Authentic n and c termini]] | ||
[[Category: | [[Category: Main protease]] | ||
[[Category: | [[Category: Sar]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 05:48:28 2008'' | |||
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Revision as of 02:48, 4 May 2008
Crystal structure of SARS-CoV main protease with authentic N and C-termini
Overview
The viral proteases have proven to be the most selective and useful for removing the fusion tags in fusion protein expression systems. As a key enzyme in the viral life-cycle, the main protease (M(pro)) is most attractive for drug design targeting the SARS coronavirus (SARS-CoV), the etiological agent responsible for the outbreak of severe acute respiratory syndrome (SARS) in 2003. In this study, SARS-CoV M(pro) was used to specifically remove the GST tag in a new fusion protein expression system. We report a new method to produce wild-type (WT) SARS-CoV M(pro) with authentic N and C termini, and compare the activity of WT protease with those of three different types of SARS-CoV M(pro) with additional residues at the N or C terminus. Our results show that additional residues at the N terminus, but not at the C terminus, of M(pro) are detrimental to enzyme activity. To explain this, the crystal structures of WT SARS-CoV M(pro) and its complex with a Michael acceptor inhibitor were determined to 1.6 Angstroms and 1.95 Angstroms resolution respectively. These crystal structures reveal that the first residue of this protease is important for sustaining the substrate-binding pocket and inhibitor binding. This study suggests that SARS-CoV M(pro) could serve as a new tag-cleavage endopeptidase for protein overproduction, and the WT SARS-CoV M(pro) is more appropriate for mechanistic characterization and inhibitor design.
About this Structure
2H2Z is a Single protein structure of sequence from Sars coronavirus. Full crystallographic information is available from OCA.
Reference
Production of authentic SARS-CoV M(pro) with enhanced activity: application as a novel tag-cleavage endopeptidase for protein overproduction., Xue X, Yang H, Shen W, Zhao Q, Li J, Yang K, Chen C, Jin Y, Bartlam M, Rao Z, J Mol Biol. 2007 Feb 23;366(3):965-75. Epub 2006 Dec 1. PMID:17189639 Page seeded by OCA on Sun May 4 05:48:28 2008
