View source for 5lk7


==Single particle reconstruction of slow bee paralysis virus virion at pH 5.5==
<SX load='5lk7' size='340' side='right' viewer='molstar' caption='[[5lk7]], [[Resolution|resolution]] 3.42&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5lk7]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Slow_bee_paralysis_virus Slow bee paralysis virus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5LK7 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5LK7 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]] 3.42&#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=5lk7 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5lk7 OCA], [https://pdbe.org/5lk7 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5lk7 RCSB], [https://www.ebi.ac.uk/pdbsum/5lk7 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5lk7 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/A7LM73_9VIRU A7LM73_9VIRU] 
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== Publication Abstract from PubMed ==
Viruses from the family Iflaviridae are insect pathogens. Many of them, including slow bee paralysis virus (SBPV), cause lethal diseases in honeybees and bumblebees, resulting in agricultural losses. Iflaviruses have nonenveloped icosahedral virions containing single-stranded RNA genomes. However, their genome release mechanism is unknown. Here, we show that low pH promotes SBPV genome release, indicating that the virus may use endosomes to enter host cells. We used cryo-EM to study a heterogeneous population of SBPV virions at pH 5.5. We determined the structures of SBPV particles before and after genome release to resolutions of 3.3 and 3.4 A, respectively. The capsids of SBPV virions in low pH are not expanded. Thus, SBPV does not appear to form "altered" particles with pores in their capsids before genome release, as is the case in many related picornaviruses. The egress of the genome from SBPV virions is associated with a loss of interpentamer contacts mediated by N-terminal arms of VP2 capsid proteins, which result in the expansion of the capsid. Pores that are 7 A in diameter form around icosahedral threefold symmetry axes. We speculate that they serve as channels for the genome release. Our findings provide an atomic-level characterization of the genome release mechanism of iflaviruses.

Cryo-EM study of slow bee paralysis virus at low pH reveals iflavirus genome release mechanism.,Kalynych S, Fuzik T, Pridal A, de Miranda J, Plevka P Proc Natl Acad Sci U S A. 2017 Jan 4. pii: 201616562. doi:, 10.1073/pnas.1616562114. PMID:28053231<ref>PMID:28053231</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 5lk7" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</SX>
[[Category: Large Structures]]
[[Category: Slow bee paralysis virus]]
[[Category: Fuzik T]]
[[Category: Kalynych S]]
[[Category: Plevka P]]