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| <SX load='6itf' size='340' side='right' viewer='molstar' caption='[[6itf]], [[Resolution|resolution]] 4.70Å' scene=''> | | <SX load='6itf' size='340' side='right' viewer='molstar' caption='[[6itf]], [[Resolution|resolution]] 4.70Å' scene=''> |
| == Structural highlights == | | == Structural highlights == |
| <table><tr><td colspan='2'>[[6itf]] is a 3 chain structure with sequence from [http://en.wikipedia.org/wiki/Fhv Fhv]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6ITF OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6ITF FirstGlance]. <br> | | <table><tr><td colspan='2'>[[6itf]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Flock_House_virus Flock House virus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6ITF OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6ITF FirstGlance]. <br> |
| </td></tr><tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">alpha ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=12287 FHV])</td></tr> | | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 4.7Å</td></tr> |
| <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Nodavirus_endopeptidase Nodavirus endopeptidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.23.44 3.4.23.44] </span></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=6itf FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6itf OCA], [https://pdbe.org/6itf PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6itf RCSB], [https://www.ebi.ac.uk/pdbsum/6itf PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6itf ProSAT]</span></td></tr> |
| <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6itf FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6itf OCA], [http://pdbe.org/6itf PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6itf RCSB], [http://www.ebi.ac.uk/pdbsum/6itf PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6itf ProSAT]</span></td></tr> | |
| </table> | | </table> |
| == Function == | | == Function == |
| [[http://www.uniprot.org/uniprot/CAPSD_FHV CAPSD_FHV]] Capsid protein alpha self-assembles to form an icosahedral procapsid with a T=3 symmetry, about 30 nm in diameter, and consisting of 60 capsid proteins trimers. In addition, 240 calcium ions are incorporated per capsid during assembly. The capsid encapsulates the two genomic RNAs. Capsid maturation occurs via autoproteolytic cleavage of capsid protein alpha generating capsid protein beta and the membrane-active peptide gamma. Peptide gamma: membrane-permeabilizing peptide produced by virus maturation, thereby creating the infectious virion. After endocytosis into the host cell, peptide gamma is probably exposed in endosomes, where it permeabilizes the endosomal membrane, facilitating translocation of viral capsid or RNA into the cytoplasm (Probable). | | [https://www.uniprot.org/uniprot/CAPSD_FHV CAPSD_FHV] Capsid protein alpha self-assembles to form an icosahedral procapsid with a T=3 symmetry, about 30 nm in diameter, and consisting of 60 capsid proteins trimers. In addition, 240 calcium ions are incorporated per capsid during assembly. The capsid encapsulates the two genomic RNAs. Capsid maturation occurs via autoproteolytic cleavage of capsid protein alpha generating capsid protein beta and the membrane-active peptide gamma. Peptide gamma: membrane-permeabilizing peptide produced by virus maturation, thereby creating the infectious virion. After endocytosis into the host cell, peptide gamma is probably exposed in endosomes, where it permeabilizes the endosomal membrane, facilitating translocation of viral capsid or RNA into the cytoplasm (Probable). |
| <div style="background-color:#fffaf0;">
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| == Publication Abstract from PubMed ==
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| The stability of icosahedral viruses is crucial for protecting the viral genome during transit; however, successful infection requires eventual disassembly of the capsid. A comprehensive understanding of how stable, uniform icosahedrons disassemble remains elusive, mainly due to the complexities involved in isolating transient intermediates. We utilized incremental heating to systematically characterize the disassembly pathway of a model nonenveloped virus and identified an intriguing link between virus maturation and disassembly. Further, we isolated and characterized two intermediates by cryo-electron microscopy and three-dimensional reconstruction, without imposing icosahedral symmetry. The first intermediate displayed a series of major, asymmetric alterations, whereas the second showed that the act of genome release, through the 2-fold axis, is actually confined to a small section on the capsid. Our study thus presents a comprehensive structural analysis of nonenveloped virus disassembly and emphasizes the asymmetric nature of programmed conformational changes.IMPORTANCE Disassembly or uncoating of an icosahedral capsid is a crucial step during infection by nonenveloped viruses. However, the dynamic and transient nature of the disassembly process makes it challenging to isolate intermediates in a temporal, stepwise manner for structural characterization. Using controlled, incremental heating, we isolated two disassembly intermediates: "eluted particles" and "puffed particles" of an insect nodavirus, Flock House virus (FHV). Cryo-electron microscopy and three-dimensional reconstruction of the FHV disassembly intermediates indicated that disassembly-related conformational alterations are minimally global and largely local, leading to asymmetry in the particle and eventual genome release without complete disintegration of the icosahedron.
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| Structural Dynamics of Nonenveloped Virus Disassembly Intermediates.,Azad K, Banerjee M J Virol. 2019 Oct 29;93(22). pii: JVI.01115-19. doi: 10.1128/JVI.01115-19. Print , 2019 Nov 15. PMID:31484752<ref>PMID:31484752</ref>
| | ==See Also== |
| | | *[[Flock house virus protein B2|Flock house virus protein B2]] |
| From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br>
| | *[[Virus coat proteins 3D structures|Virus coat proteins 3D structures]] |
| </div>
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| <div class="pdbe-citations 6itf" style="background-color:#fffaf0;"></div>
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| == References ==
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| <references/>
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| __TOC__ | | __TOC__ |
| </SX> | | </SX> |
| [[Category: Fhv]] | | [[Category: Flock House virus]] |
| [[Category: Large Structures]] | | [[Category: Large Structures]] |
| [[Category: Nodavirus endopeptidase]]
| | [[Category: Azad K]] |
| [[Category: Azad, K]] | | [[Category: Banerjee M]] |
| [[Category: Banerjee, M]] | |
| [[Category: Asymmetric reconstruction]]
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| [[Category: Disassembly intermediate]]
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| [[Category: Flock house virus]]
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| [[Category: Virus]]
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