View source for 3phu


==OTU Domain of Crimean Congo Hemorrhagic Fever Virus==
<StructureSection load='3phu' size='340' side='right'caption='[[3phu]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3phu]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Crimean-Congo_hemorrhagic_fever_virus_strain_IbAr10200 Crimean-Congo hemorrhagic fever virus strain IbAr10200]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3PHU OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3PHU FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.2&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CSD:3-SULFINOALANINE'>CSD</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=3phu FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3phu OCA], [https://pdbe.org/3phu PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3phu RCSB], [https://www.ebi.ac.uk/pdbsum/3phu PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3phu ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/L_CCHFI L_CCHFI] Displays RNA-directed RNA polymerase, deubiquitinating and deISGylase activities. RNA-dependent RNA polymerase is responsible for replication and transcription of the viral RNA genome. The deubiquitinating activity cleaves both ubiquitinated and ISGylated products and may therefore regulate ubiquitin and ISG15 dependent innate immunity.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Crimean Congo hemorrhagic fever virus (CCHFV) is a deadly human pathogen that evades innate immune responses by efficiently interfering with antiviral signaling pathways mediated by NF-kappaB, IRF3, and IFNalpha/beta. These pathways rely on protein ubiquitination for their activation, and one outcome is the modification of proteins with the ubiquitin (Ub)-like modifier interferon-stimulated gene (ISG)15. CCHFV and related viruses encode a deubiquitinase (DUB) of the ovarian tumor (OTU) family, which unlike eukaryotic OTU DUBs also targets ISG15 modifications. Here we characterized the viral OTU domain of CCHFV (vOTU) biochemically and structurally, revealing that it hydrolyzes four out of six tested Ub linkages, but lacks activity against linear and K29-linked Ub chains. vOTU cleaved Ub and ISG15 with similar kinetics, and we were able to understand vOTU cross-reactivity at the molecular level from crystal structures of vOTU in complex with Ub and ISG15. An N-terminal extension in vOTU not present in eukaryotic OTU binds to the hydrophobic Ile44 patch of Ub, which results in a dramatically different Ub orientation compared to a eukaryotic OTU-Ub complex. The C-terminal Ub-like fold of ISG15 (ISG15-C) adopts an equivalent binding orientation. Interestingly, ISG15-C contains an additional second hydrophobic surface that is specifically contacted by vOTU. These subtle differences in Ub/ISG15 binding allowed the design of vOTU variants specific for either Ub or ISG15, which will be useful tools to understand the relative contribution of ubiquitination vs. ISGylation in viral infection. Furthermore, the crystal structures will allow structure-based design of antiviral agents targeting this enzyme.

Molecular basis for ubiquitin and ISG15 cross-reactivity in viral ovarian tumor domains.,Akutsu M, Ye Y, Virdee S, Chin JW, Komander D Proc Natl Acad Sci U S A. 2011 Feb 8;108(6):2228-33. Epub 2011 Jan 25. PMID:21266548<ref>PMID:21266548</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 3phu" style="background-color:#fffaf0;"></div>

==See Also==
*[[RNA polymerase 3D structures|RNA polymerase 3D structures]]
== References ==
<references/>
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</StructureSection>
[[Category: Crimean-Congo hemorrhagic fever virus strain IbAr10200]]
[[Category: Large Structures]]
[[Category: Akutsu M]]
[[Category: Komander D]]
[[Category: Virdee S]]
[[Category: Ye Y]]