View source for 1jek


==Visna TM CORE STRUCTURE==
<StructureSection load='1jek' size='340' side='right'caption='[[1jek]], [[Resolution|resolution]] 1.50&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1jek]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Visna/maedi_virus_EV1_KV1772 Visna/maedi virus EV1 KV1772]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1JEK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1JEK 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]] 1.5&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACE:ACETYL+GROUP'>ACE</scene>, <scene name='pdbligand=NH2:AMINO+GROUP'>NH2</scene></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=1jek FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1jek OCA], [https://pdbe.org/1jek PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1jek RCSB], [https://www.ebi.ac.uk/pdbsum/1jek PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1jek ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/ENV_VILVK ENV_VILVK] The surface protein (SU) attaches the virus to the host cell by binding to its receptor. This interaction triggers the refolding of the transmembrane protein (TM) and is thought to activate its fusogenic potential by unmasking its fusion peptide. Fusion occurs at the host cell plasma membrane (By similarity).  The transmembrane protein (TM) acts as a class I viral fusion protein. Under the current model, the protein has at least 3 conformational states: pre-fusion native state, pre-hairpin intermediate state, and post-fusion hairpin state. During viral and target cell membrane fusion, the coiled coil regions (heptad repeats) assume a trimer-of-hairpins structure, positioning the fusion peptide in close proximity to the C-terminal region of the ectodomain. The formation of this structure appears to drive apposition and subsequent fusion of viral and target cell membranes. Membranes fusion leads to delivery of the nucleocapsid into the cytoplasm (By similarity).
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/je/1jek_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1jek ConSurf].
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== Publication Abstract from PubMed ==
Structural studies of viral membrane fusion proteins suggest that a "trimer-of-hairpins" motif plays a critical role in the membrane fusion process of many enveloped viruses. In this motif, a coiled coil (formed by homotrimeric association of the N-terminal regions of the protein) is surrounded by three C-terminal regions that pack against the coiled coil in an oblique antiparallel manner. The resulting trimer-of-hairpins structure serves to bring the viral and cellular membranes together for fusion. learncoil-vmf, a computational program developed to recognize coiled coil-like regions that form the trimer-of-hairpins motif, predicts these regions in the membrane fusion protein of the Visna virus. Peptides corresponding to the computationally identified sequences were synthesized, and the soluble core of the Visna membrane fusion protein was reconstituted in solution. Its crystal structure at 1.5-A resolution demonstrates that a trimer-of-hairpins structure is formed. Remarkably, despite less than 23% sequence identity, the ectodomains in Visna and HIV-1 envelope glycoproteins show detailed structural conservation, especially within the area of a hydrophobic pocket in the central coiled coil currently being targeted for the development of new anti-HIV drugs.

The trimer-of-hairpins motif in membrane fusion: Visna virus.,Malashkevich VN, Singh M, Kim PS Proc Natl Acad Sci U S A. 2001 Jul 17;98(15):8502-6. Epub 2001 Jul 10. PMID:11447278<ref>PMID:11447278</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 1jek" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Visna/maedi virus EV1 KV1772]]
[[Category: Kim PS]]
[[Category: Malashkevich VN]]
[[Category: Singh M]]