2PWX

Crystal structure of G11A mutant of SARS-CoV 3C-like protease

Summary for 2PWX

• Entry DOI: 10.2210/pdb2pwx/pdb
• Descriptor: 3C-like proteinase (2 entities in total)
• Functional Keywords: chymotrypsin fold, hydrolase
• Biological source: SARS coronavirus
• Cellular location: Non-structural protein 3: Host membrane; Multi-pass membrane protein (Potential). Non-structural protein 4: Host membrane; Multi-pass membrane protein (Potential). Non-structural protein 6: Host membrane; Multi-pass membrane protein (Potential). Non-structural protein 7: Host cytoplasm, host perinuclear region (By similarity). Non-structural protein 8: Host cytoplasm, host perinuclear region (By similarity). Non-structural protein 9: Host cytoplasm, host perinuclear region (By similarity). Non-structural protein 10: Host cytoplasm, host perinuclear region (By similarity). Helicase: Host endoplasmic reticulum-Golgi intermediate compartment (Potential). Uridylate-specific endoribonuclease: Host cytoplasm, host perinuclear region (By similarity): P59641
• Total number of polymer chains: 1
• Total formula weight: 34034.79

Authors

Chen, S.,Hu, T.,Jiang, H.,Shen, X. (deposition date: 2007-05-14, release date: 2007-10-30, Last modification date: 2024-02-21)

Primary citation

Chen, S.,Hu, T.,Zhang, J.,Chen, J.,Chen, K.,Ding, J.,Jiang, H.,Shen, X.
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.
J.Biol.Chem., 283:554-564, 2008

PubMed Abstract: 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.

PubMed: 17977841
DOI: 10.1074/jbc.M705240200

Experimental method

X-RAY DIFFRACTION (2.5 Å)