2c3s

Structure Of Sars Cov Main Proteinase At 1.9 A (Ph6.5)

spinqualitylabelsall models 2c3s, resolution 1.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2c3s is a 1 chain structure with sequence from Cvhsa. This structure supersedes the now removed PDB entry 2bw6. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Related: 1o5s, 1p76, 1p9t, 1pa5, 1puk, 1q1x, 1uj1, 1uk2, 1uk3, 1uk4, 1uw7, 1wof, 2amd, 2amq, 2bx3, 2bx4, 2d2d Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [R1AB_CVHSA] The replicase polyprotein of coronaviruses is a multifunctional protein: it contains the activities necessary for the transcription of negative stranded RNA, leader RNA, subgenomic mRNAs and progeny virion RNA as well as proteinases responsible for the cleavage of the polyprotein into functional products (By similarity). The papain-like proteinase (PL-PRO) is responsible for the cleavages located at the N-terminus of replicase polyprotein. In addition, PL-PRO possesses a deubiquitinating/deISGylating activity and processes both 'Lys-48'- and 'Lys-63'-linked polyubiquitin chains from cellular substrates. Antagonizes innate immune induction of type I interferon by blocking the phosphorylation, dimerization and subsequent nuclear translocation of host IRF-3. The main proteinase 3CL-PRO is responsible for the majority of cleavages as it cleaves the C-terminus of replicase polyprotein at 11 sites. Recognizes substrates containing the core sequence [ILMVF]-Q-|-[SGACN]. Inhibited by the substrate-analog Cbz-Val-Asn-Ser-Thr-Leu-Gln-CMK (By similarity). Also contains an ADP-ribose-1-phosphate (ADRP)-binding function. The helicase which contains a zinc finger structure displays RNA and DNA duplex-unwinding activities with 5' to 3' polarity. Its ATPase activity is strongly stimulated by poly(U), poly(dT), poly(C), poly(dA), but not by poly(G). Activity of helicase is dependent on magnesium. The exoribonuclease acts on both ssRNA and dsRNA in a 3' to 5' direction. Nsp7-nsp8 hexadecamer may possibly confer processivity to the polymerase, maybe by binding to dsRNA or by producing primers utilized by the latter. Nsp9 is a ssRNA-binding protein. NendoU is a Mn(2+)-dependent, uridylate-specific enzyme, which leaves 2'-3'-cyclic phosphates 5' to the cleaved bond. 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 34 kDa main proteinase (Mpro) from the severe acute respiratory syndrome coronavirus (SARS-CoV) plays an important role in the virus life cycle through the specific processing of viral polyproteins. As such, SARS-CoV Mpro is a key target for the identification of specific inhibitors directed against the SARS virus. With a view to facilitating the development of such compounds, crystals were obtained of the enzyme at pH 6.5 in the orthorhombic space group P2(1)2(1)2 that diffract to a resolution of 1.9 A. These crystals contain one monomer per asymmetric unit and the biologically active dimer is generated via the crystallographic twofold axis. The conformation of the catalytic site indicates that the enzyme is active in the crystalline form and thus suitable for structure-based inhibition studies. Structure of the SARS coronavirus main proteinase as an active C2 crystallographic dimer.,Xu T, Ooi A, Lee HC, Wilmouth R, Liu DX, Lescar J Acta Crystallogr Sect F Struct Biol Cryst Commun. 2005 Nov 1;61(Pt, 11):964-6. Epub 2005 Oct 20. PMID:16511208 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also SARS Coronavirus Main Proteinase

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