View source for 4wse


==Crystal structure of the Mimivirus polyadenylate synthase==
<StructureSection load='4wse' size='340' side='right'caption='[[4wse]], [[Resolution|resolution]] 2.84&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4wse]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Acanthamoeba_polyphaga_mimivirus Acanthamoeba polyphaga mimivirus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4WSE OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4WSE 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]] 2.84&#8491;</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=4wse FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4wse OCA], [https://pdbe.org/4wse PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4wse RCSB], [https://www.ebi.ac.uk/pdbsum/4wse PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4wse ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/PAP1_MIMIV PAP1_MIMIV] Polymerase that creates the 3'-poly(A) tail of mRNA's.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Giant viruses from the Mimiviridae family replicate entirely in their host cytoplasm where their genes are transcribed by a viral transcription apparatus. mRNA polyadenylation uniquely occurs at hairpin-forming palindromic sequences terminating viral transcripts. Here we show that a conserved gene cluster both encode the enzyme responsible for the hairpin cleavage and the viral polyA polymerases (vPAP). Unexpectedly, the vPAPs are homodimeric and uniquely self-processive. The vPAP backbone structures exhibit a symmetrical architecture with two subdomains sharing a nucleotidyltransferase topology, suggesting that vPAPs originate from an ancestral duplication. A Poxvirus processivity factor homologue encoded by Megavirus chilensis displays a conserved 5'-GpppA 2'O methyltransferase activity but is also able to internally methylate the mRNAs' polyA tails. These findings elucidate how the arm wrestling between hosts and their viruses to access the translation machinery is taking place in Mimiviridae.

mRNA maturation in giant viruses: variation on a theme.,Priet S, Lartigue A, Debart F, Claverie JM, Abergel C Nucleic Acids Res. 2015 Mar 16. pii: gkv224. PMID:25779049<ref>PMID:25779049</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4wse" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Acanthamoeba polyphaga mimivirus]]
[[Category: Large Structures]]
[[Category: Abergel C]]
[[Category: Claverie JM]]
[[Category: Lartigue A]]
[[Category: Priet S]]