2a5k

Crystal structures of SARS coronavirus main peptidase inhibited by an aza-peptide epoxide in space group P212121Crystal structures of SARS coronavirus main peptidase inhibited by an aza-peptide epoxide in space group P212121

Structural highlights 2a5k is a 2 chain structure with sequence from Sars coronavirus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: Related: 2a5a, 2a5i Resources: FirstGlance, OCA, RCSB, PDBsum Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed The main peptidase (M(pro)) from the coronavirus (CoV) causing severe acute respiratory syndrome (SARS) is one of the most attractive molecular targets for the development of anti-SARS agents. We report the irreversible inhibition of SARS-CoV M(pro) by an aza-peptide epoxide (APE; k(inact)/K(i) = 1900(+/-400) M(-1) s(-1)). The crystal structures of the M(pro):APE complex in the space groups C2 and P2(1)2(1)2(1) revealed the formation of a covalent bond between the catalytic Cys145 S(gamma) atom of the peptidase and the epoxide C3 atom of the inhibitor, substantiating the mode of action of this class of cysteine-peptidase inhibitors. The aza-peptide component of APE binds in the substrate-binding regions of M(pro) in a substrate-like manner, with excellent structural and chemical complementarity. In addition, the crystal structure of unbound M(pro) in the space group C2 revealed that the "N-fingers" (N-terminal residues 1 to 7) of both protomers of M(pro) are well defined and the substrate-binding regions of both protomers are in the catalytically competent conformation at the crystallization pH of 6.5, contrary to the previously determined crystal structures of unbound M(pro) in the space group P2(1). Crystal structures of the main peptidase from the SARS coronavirus inhibited by a substrate-like aza-peptide epoxide.,Lee TW, Cherney MM, Huitema C, Liu J, James KE, Powers JC, Eltis LD, James MN J Mol Biol. 2005 Nov 11;353(5):1137-51. Epub 2005 Sep 27. PMID:16219322 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also SARS Coronavirus Main Proteinase

spinqualitylabelsall models 2a5k, resolution 2.30Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image