View source for 2p3o


==Crystal Structure of Dengue Methyltransferase in Complex with 7MeGpppA and S-Adenosyl-L-homocysteine==
<StructureSection load='2p3o' size='340' side='right'caption='[[2p3o]], [[Resolution|resolution]] 2.76&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2p3o]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Dengue_virus_2 Dengue virus 2]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2P3O OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2P3O 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]] 2.756&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CIT:CITRIC+ACID'>CIT</scene>, <scene name='pdbligand=GTA:P1-7-METHYLGUANOSINE-P3-ADENOSINE-5,5-TRIPHOSPHATE'>GTA</scene>, <scene name='pdbligand=SAH:S-ADENOSYL-L-HOMOCYSTEINE'>SAH</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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=2p3o FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2p3o OCA], [https://pdbe.org/2p3o PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2p3o RCSB], [https://www.ebi.ac.uk/pdbsum/2p3o PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2p3o ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/Q9WLZ5_9FLAV Q9WLZ5_9FLAV] Component of the viral RNA replication complex that functions in virion assembly and antagonizes the host immune response.[ARBA:ARBA00024317]  Functions as a signal peptide for NS4B and is required for the interferon antagonism activity of the latter.[ARBA:ARBA00003504]  Serine protease subunit NS2B: Required cofactor for the serine protease function of NS3.[PROSITE-ProRule:PRU00859]
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/p3/2p3o_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</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/main_output.php?pdb_ID=2p3o ConSurf].
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== Publication Abstract from PubMed ==
The N-terminal 33 kDa domain of non-structural protein 5 (NS5) of dengue virus (DV), named NS5MTase(DV), is involved in two of four steps required for the formation of the viral mRNA cap (7Me)GpppA(2'OMe), the guanine-N7 and the adenosine-2'O methylation. Its S-adenosyl-l-methionine (AdoMet) dependent 2'O-methyltransferase (MTase) activity has been shown on capped (7Me+/-)GpppAC(n) RNAs. Here we report structural and binding studies using cap analogues and capped RNAs. We have solved five crystal structures at 1.8 A to 2.8 A resolution of NS5MTase(DV) in complex with cap analogues and the co-product of methylation S-adenosyl-l-homocysteine (AdoHcy). The cap analogues can adopt several conformations. The guanosine moiety of all cap analogues occupies a GTP-binding site identified earlier, indicating that GTP and cap share the same binding site. Accordingly, we show that binding of (7Me)GpppAC(4) and (7Me)GpppAC(5) RNAs is inhibited in the presence of GTP, (7Me)GTP and (7Me)GpppA but not by ATP. This particular position of the cap is in accordance with the 2'O-methylation step. A model was generated of a ternary 2'O-methylation complex of NS5MTase(DV), (7Me)GpppA and AdoMet. RNA-binding increased when (7Me+/-)GpppAGC(n-1) starting with the consensus sequence GpppAG, was used instead of (7Me+/-)GpppAC(n). In the NS5MTase(DV)-GpppA complex the cap analogue adopts a folded, stacked conformation uniquely possible when adenine is the first transcribed nucleotide at the 5' end of nascent RNA, as it is the case in all flaviviruses. This conformation cannot be a functional intermediate of methylation, since both the guanine-N7 and adenosine-2'O positions are too far away from AdoMet. We hypothesize that this conformation mimics the reaction product of a yet-to-be-demonstrated guanylyltransferase activity. A putative Flavivirus RNA capping pathway is proposed combining the different steps where the NS5MTase domain is involved.

Structural and functional analysis of methylation and 5'-RNA sequence requirements of short capped RNAs by the methyltransferase domain of dengue virus NS5.,Egloff MP, Decroly E, Malet H, Selisko B, Benarroch D, Ferron F, Canard B J Mol Biol. 2007 Sep 21;372(3):723-36. Epub 2007 Jul 12. PMID:17686489<ref>PMID:17686489</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 2p3o" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Dengue virus 2]]
[[Category: Large Structures]]
[[Category: Egloff MP]]