View source for 8rn1


==Influenza B polymerase, monomeric encapsidase with 5' cRNA hook bound==
<StructureSection load='8rn1' size='340' side='right'caption='[[8rn1]], [[Resolution|resolution]] 3.64&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[8rn1]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Influenza_B_virus_(B/Memphis/13/2003) Influenza B virus (B/Memphis/13/2003)]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=8RN1 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=8RN1 FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 3.64&#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=8rn1 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=8rn1 OCA], [https://pdbe.org/8rn1 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=8rn1 RCSB], [https://www.ebi.ac.uk/pdbsum/8rn1 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=8rn1 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/Q5V8Z9_9INFB Q5V8Z9_9INFB] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Replication of influenza viral RNA depends on at least two viral polymerases, a parental replicase and an encapsidase, and cellular factor ANP32. ANP32 comprises an LRR domain and a long C-terminal low complexity acidic region (LCAR). Here we present evidence suggesting that ANP32 is recruited to the replication complex as an electrostatic chaperone that stabilises the encapsidase moiety within apo-polymerase symmetric dimers that are distinct for influenza A and B polymerases. The ANP32 bound encapsidase, then forms the asymmetric replication complex with the replicase, which is embedded in a parental ribonucleoprotein particle (RNP). Cryo-EM structures reveal the architecture of the influenza A and B replication complexes and the likely trajectory of the nascent RNA product into the encapsidase. The cryo-EM map of the FluB replication complex shows extra density attributable to the ANP32 LCAR wrapping around and stabilising the apo-encapsidase conformation. These structures give new insight into the various mutations that adapt avian strain polymerases to use the distinct ANP32 in mammalian cells.

Structures of influenza A and B replication complexes give insight into avian to human host adaptation and reveal a role of ANP32 as an electrostatic chaperone for the apo-polymerase.,Arragain B, Krischuns T, Pelosse M, Drncova P, Blackledge M, Naffakh N, Cusack S Nat Commun. 2024 Aug 19;15(1):6910. doi: 10.1038/s41467-024-51007-3. PMID:39160148<ref>PMID:39160148</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 8rn1" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Large Structures]]
[[Category: Arragain B]]
[[Category: Cusack S]]