==Crystal structure of HIV-1 JR-FL gp120 core protein containing the third variable region (V3) complexed with CD4 and the X5 antibody==

<StructureSection load='2b4c' size='340' side='right' caption='[[2b4c]], [[Resolution|resolution]] 3.30&Aring;' scene=''>

<table><tr><td colspan='2'>[[2b4c]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/9hiv1 9hiv1] and [http://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2B4C OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2B4C FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=FUC:ALPHA-L-FUCOSE'>FUC</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=NDG:2-(ACETYLAMINO)-2-DEOXY-A-D-GLUCOPYRANOSE'>NDG</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>, <scene name='pdbligand=XYL:D-XYLITOL'>XYL</scene></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=2b4c FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2b4c OCA], [http://pdbe.org/2b4c PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2b4c RCSB], [http://www.ebi.ac.uk/pdbsum/2b4c PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2b4c ProSAT]</span></td></tr>

== Function ==

[[http://www.uniprot.org/uniprot/CD4_HUMAN CD4_HUMAN]] Accessory protein for MHC class-II antigen/T-cell receptor interaction. May regulate T-cell activation. Induces the aggregation of lipid rafts.

<scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/b4/2b4c_consurf.spt"</scriptWhenChecked>

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== Publication Abstract from PubMed ==

The third variable region (V3) of the HIV-1 gp120 envelope glycoprotein is immunodominant and contains features essential for coreceptor binding. We determined the structure of V3 in the context of an HIV-1 gp120 core complexed to the CD4 receptor and to the X5 antibody at 3.5 angstrom resolution. Binding of gp120 to cell-surface CD4 would position V3 so that its coreceptor-binding tip protrudes 30 angstroms from the core toward the target cell membrane. The extended nature and antibody accessibility of V3 explain its immunodominance. Together, the results provide a structural rationale for the role of V3 in HIV entry and neutralization.

Structure of a V3-containing HIV-1 gp120 core.,Huang CC, Tang M, Zhang MY, Majeed S, Montabana E, Stanfield RL, Dimitrov DS, Korber B, Sodroski J, Wilson IA, Wyatt R, Kwong PD Science. 2005 Nov 11;310(5750):1025-8. PMID:16284180<ref>PMID:16284180</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>

</div>

<div class="pdbe-citations 2b4c" style="background-color:#fffaf0;"></div>

==See Also==

*[[CD4|CD4]]

== References ==

<references/>

[[Category: Human]]

[[Category: Dimitrov, D S]]

[[Category: Hiv-1]]

[[Category: X5]]