3d23

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[[Image:3d23.png|left|200px]]
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==Main protease of HCoV-HKU1==
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<StructureSection load='3d23' size='340' side='right' caption='[[3d23]], [[Resolution|resolution]] 2.50&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[3d23]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Unidentified_human_coronavirus Unidentified human coronavirus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3D23 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3D23 FirstGlance]. <br>
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</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=3IH:N-[(5-METHYLISOXAZOL-3-YL)CARBONYL]ALANYL-L-VALYL-N~1~-((1R,2Z)-4-(BENZYLOXY)-4-OXO-1-{[(3R)-2-OXOPYRROLIDIN-3-YL]METHYL}BUT-2-ENYL)-L-LEUCINAMIDE'>3IH</scene></td></tr>
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<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">rep ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=694448 unidentified human coronavirus])</td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3d23 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3d23 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=3d23 RCSB], [http://www.ebi.ac.uk/pdbsum/3d23 PDBsum]</span></td></tr>
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</table>
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== Function ==
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[[http://www.uniprot.org/uniprot/R1AB_CVHN1 R1AB_CVHN1]] 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. The papain-like proteinase 1 (PL1-PRO) and papain-like proteinase 2 (PL2-PRO) are responsible for the cleavages located at the N-terminus of the replicase polyprotein. In addition, PLP2 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 (By similarity). 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. Also contains an ADP-ribose-1''-phosphate (ADRP)-binding function (By similarity). The helicase which contains a zinc finger structure displays RNA and DNA duplex-unwinding activities with 5' to 3' polarity. ATPase activity is strongly stimulated by poly(U), poly(dT), poly(C), poly(dA), but not by poly(G) (By similarity). The exoribonuclease acts on both ssRNA and dsRNA in a 3' to 5' direction (By similarity). Nsp7-nsp8 hexadecamer may possibly confer processivity to the polymerase, maybe by binding to dsRNA or by producing primers utilized by the latter (By similarity). Nsp9 is a ssRNA-binding protein (By similarity). NendoU is a Mn(2+)-dependent, uridylate-specific enzyme, which leaves 2'-3'-cyclic phosphates 5' to the cleaved bond (By similarity).
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/d2/3d23_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/chain_selection.php?pdb_ID=2ata ConSurf].
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<div style="clear:both"></div>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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The newly emergent human coronavirus HKU1 (HCoV-HKU1) was first identified in Hong Kong in 2005. Infection by HCoV-HKU1 occurs worldwide and causes syndromes such as the common cold, bronchitis, and pneumonia. The CoV main protease (M(pro)), which is a key enzyme in viral replication via the proteolytic processing of the replicase polyproteins, has been recognized as an attractive target for rational drug design. In this study, we report the structure of HCoV-HKU1 M(pro) in complex with a Michael acceptor, inhibitor N3. The structure of HCoV-HKU1 provides a high-quality model for group 2A CoVs, which are distinct from group 2B CoVs such as severe acute respiratory syndrome CoV. The structure, together with activity assays, supports the relative conservation at the P1 position that was discovered by sequencing the HCoV-HKU1 genome. Combined with structural data from other CoV M(pro)s, the HCoV-HKU1 M(pro) structure reported here provides insights into both substrate preference and the design of antivirals targeting CoVs.
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{{STRUCTURE_3d23| PDB=3d23 | SCENE= }}
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Structure of the main protease from a global infectious human coronavirus, HCoV-HKU1.,Zhao Q, Li S, Xue F, Zou Y, Chen C, Bartlam M, Rao Z J Virol. 2008 Sep;82(17):8647-55. Epub 2008 Jun 18. PMID:18562531<ref>PMID:18562531</ref>
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===Main protease of HCoV-HKU1===
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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{{ABSTRACT_PUBMED_18562531}}
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==About this Structure==
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[[3d23]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Unidentified_human_coronavirus Unidentified human coronavirus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3D23 OCA].
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==See Also==
==See Also==
*[[SARS Coronavirus Main Proteinase|SARS Coronavirus Main Proteinase]]
*[[SARS Coronavirus Main Proteinase|SARS Coronavirus Main Proteinase]]
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== References ==
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==Reference==
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<references/>
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<ref group="xtra">PMID:018562531</ref><references group="xtra"/>
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__TOC__
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</StructureSection>
[[Category: Unidentified human coronavirus]]
[[Category: Unidentified human coronavirus]]
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[[Category: Chen, C.]]
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[[Category: Chen, C]]
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[[Category: Li, S.]]
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[[Category: Li, S]]
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[[Category: Zhao, Q.]]
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[[Category: Zhao, Q]]
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[[Category: Zou, Y.]]
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[[Category: Zou, Y]]
[[Category: Atp-binding]]
[[Category: Atp-binding]]
[[Category: Endonuclease]]
[[Category: Endonuclease]]

Revision as of 18:02, 25 December 2014

Main protease of HCoV-HKU1

3d23, resolution 2.50Å

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OCA

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