View source for 8cl4


==HIV-1 mature capsid pentamer from CA-IP6 CLPs bound to Sec24C peptide==
<StructureSection load='8cl4' size='340' side='right'caption='[[8cl4]], [[Resolution|resolution]] 3.14&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[8cl4]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Human_immunodeficiency_virus_1 Human immunodeficiency virus 1]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=8CL4 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=8CL4 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]] 3.14&#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=8cl4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=8cl4 OCA], [https://pdbe.org/8cl4 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=8cl4 RCSB], [https://www.ebi.ac.uk/pdbsum/8cl4 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=8cl4 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/GAG_HV1N5 GAG_HV1N5] Matrix protein p17 targets Gag and Gag-Pol polyproteins to the plasma membrane via a multipartite membrane binding signal, that includes its myristoylated N-terminus. Also mediates nuclear localization of the preintegration complex. Implicated in the release from host cell mediated by Vpu.  Capsid protein p24 forms the conical core of the virus that encapsulates the genomic RNA-nucleocapsid complex.  Nucleocapsid protein p7 encapsulates and protects viral dimeric unspliced (genomic) RNA. Binds these RNAs through its zinc fingers.  p6-gag plays a role in budding of the assembled particle by interacting with the host class E VPS proteins TSG101 and PDCD6IP/AIP1 (By similarity).
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== Publication Abstract from PubMed ==
The mature HIV-1 capsid protects the viral genome and interacts with host proteins to travel from the cell periphery into the nucleus. To achieve this, the capsid protein, CA, constructs conical capsids from a lattice of hexamers and pentamers, and engages in and then relinquishes multiple interactions with cellular proteins in an orchestrated fashion. Cellular host factors including Nup153, CPSF6, and Sec24C engage the same pocket within CA hexamers. How CA assembles pentamers and hexamers of different curvatures, how CA oligomerization states or curvature might modulate host-protein interactions, and how binding of multiple cofactors to a single site is coordinated, all remain to be elucidated. Here, using single-particle cryoEM, we have determined the structure of the mature HIV-1 CA pentamer and hexamer from conical CA-IP(6) polyhedra to ~3 A resolution. We also determined structures of hexamers in the context of multiple lattice curvatures and number of pentamer contacts. Comparison of these structures, bound or not to host protein peptides, revealed two structural switches within HIV-1 CA that modulate peptide binding according to CA lattice curvature and whether CA is hexameric or pentameric. These observations suggest that the conical HIV-1 capsid has different host-protein binding properties at different positions on its surface, which may facilitate cell entry and represent an evolutionary advantage of conical morphology.

Two structural switches in HIV-1 capsid regulate capsid curvature and host factor binding.,Stacey JCV, Tan A, Lu JM, James LC, Dick RA, Briggs JAG Proc Natl Acad Sci U S A. 2023 Apr 18;120(16):e2220557120. doi: , 10.1073/pnas.2220557120. Epub 2023 Apr 11. PMID:37040417<ref>PMID:37040417</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 8cl4" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Human immunodeficiency virus 1]]
[[Category: Large Structures]]
[[Category: Briggs JAG]]
[[Category: Stacey JCV]]