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'''Crystal structure of G11A mutant of SARS-CoV 3C-like protease''' | '''Crystal structure of G11A mutant of SARS-CoV 3C-like protease''' | ||
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[[Category: Jiang, H.]] | [[Category: Jiang, H.]] | ||
[[Category: Shen, X.]] | [[Category: Shen, X.]] | ||
[[Category: | [[Category: Chymotrypsin fold]] | ||
[[Category: | [[Category: Hydrolase]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 13:56:12 2008'' | |||
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Revision as of 13:56, 4 May 2008
Crystal structure of G11A mutant of SARS-CoV 3C-like protease
OverviewOverview
SARS-CoV 3C-like protease (3CL(pro)) is an attractive target for anti-severe acute respiratory syndrome (SARS) drug discovery, and its dimerization has been extensively proved to be indispensable for enzymatic activity. However, the reason why the dissociated monomer is inactive still remains unclear due to the absence of the monomer structure. In this study, we showed that mutation of the dimer-interface residue Gly-11 to alanine entirely abolished the activity of SARS-CoV 3CL(pro). Subsequently, we determined the crystal structure of this mutant and discovered a complete crystallographic dimer dissociation of SARS-CoV 3CL(pro). The mutation might shorten the alpha-helix A' of domain I and cause a mis-oriented N-terminal finger that could not correctly squeeze into the pocket of another monomer during dimerization, thus destabilizing the dimer structure. Several structural features essential for catalysis and substrate recognition are severely impaired in the G11A monomer. Moreover, domain III rotates dramatically against the chymotrypsin fold compared with the dimer, from which we proposed a putative dimerization model for SARS-CoV 3CL(pro). As the first reported monomer structure for SARS-CoV 3CL(pro), the crystal structure of G11A mutant might provide insight into the dimerization mechanism of the protease and supply direct structural evidence for the incompetence of the dissociated monomer.
About this StructureAbout this Structure
2PWX is a Single protein structure of sequence from Sars coronavirus. Full crystallographic information is available from OCA.
ReferenceReference
Mutation of Gly-11 on the dimer interface results in the complete crystallographic dimer dissociation of severe acute respiratory syndrome coronavirus 3C-like protease: crystal structure with molecular dynamics simulations., Chen S, Hu T, Zhang J, Chen J, Chen K, Ding J, Jiang H, Shen X, J Biol Chem. 2008 Jan 4;283(1):554-64. Epub 2007 Oct 31. PMID:17977841 Page seeded by OCA on Sun May 4 13:56:12 2008