2gt7

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spinqualitylabelsall models 2gt7, resolution 1.82Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image

Crystal structure of SARS coronavirus main peptidase at pH 6.0 in the space group P21

Overview

The SARS coronavirus main peptidase (SARS-CoV M(pro)) plays an essential, role in the life-cycle of the virus and is a primary target for the, development of anti-SARS agents. Here, we report the crystal structure of, M(pro) at a resolution of 1.82 A, in space group P2(1) at pH 6.0. In, contrast to the previously reported structure of M(pro) in the same space, group at the same pH, the active sites and the S1 specificity pockets of, both protomers in the structure of M(pro) reported here are in the, catalytically competent conformation, suggesting their conformational, flexibility. We report two crystal structures of M(pro) having an, additional Ala at the N terminus of each protomer (M(+A(-1))(pro)), both, at a resolution of 2.00 A, in space group P4(3)2(1)2: one unbound and one, bound by a substrate-like aza-peptide epoxide (APE). In the unbound form, the active sites and the S1 specificity pockets of both protomers of, M(+A(-1))(pro) are observed in a collapsed (catalytically incompetent), conformation; whereas they are in an open (catalytically competent), conformation in the APE-bound form. The observed conformational, flexibility of the active sites and the S1 specificity pockets suggests, that these parts of M(pro) exist in dynamic equilibrium. The structural, data further suggest that the binding of APE to M(pro) follows an, induced-fit model. The substrate likely also binds in an induced-fit, manner in a process that may help drive the catalytic cycle.

About this Structure

2GT7 is a Single protein structure of sequence from Sars coronavirus with as ligand. Full crystallographic information is available from OCA.

Reference

Crystal Structures Reveal an Induced-fit Binding of a Substrate-like Aza-peptide Epoxide to SARS Coronavirus Main Peptidase., Lee TW, Cherney MM, Liu J, James KE, Powers JC, Eltis LD, James MN, J Mol Biol. 2007 Feb 23;366(3):916-32. Epub 2006 Dec 2. PMID:17196984

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