View source for 3iyw


==West Nile virus in complex with Fab fragments of MAb CR4354 (fitted coordinates of envelope proteins and Fab fragments of one icosahedral ASU)==
<SX load='3iyw' size='340' side='right' viewer='molstar' caption='[[3iyw]], [[Resolution|resolution]] 13.70&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3iyw]] is a 7 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human] and [http://en.wikipedia.org/wiki/Wnv Wnv]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3IYW OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3IYW FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=FUL:BETA-L-FUCOSE'>FUL</scene>, <scene name='pdbligand=NDG:2-(ACETYLAMINO)-2-DEOXY-A-D-GLUCOPYRANOSE'>NDG</scene></td></tr>
<tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=PCA:PYROGLUTAMIC+ACID'>PCA</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3n9g|3n9g]], [[2hg0|2hg0]]</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=3iyw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3iyw OCA], [http://pdbe.org/3iyw PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3iyw RCSB], [http://www.ebi.ac.uk/pdbsum/3iyw PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3iyw ProSAT]</span></td></tr>
</table>
== Function ==
[[http://www.uniprot.org/uniprot/Q9Q6P4_WNV Q9Q6P4_WNV]] Envelope protein E binding to host cell surface receptor is followed by virus internalization through clathrin-mediated endocytosis. Envelope protein E is subsequently involved in membrane fusion between virion and host late endosomes. Synthesized as a homodimer with prM which acts as a chaperone for envelope protein E. After cleavage of prM, envelope protein E dissociate from small envelope protein M and homodimerizes (By similarity).[SAAS:SAAS011998_004_099774] 
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== Publication Abstract from PubMed ==
Many flaviviruses are significant human pathogens, with the humoral immune response playing an essential role in restricting infection and disease. CR4354, a human monoclonal antibody isolated from a patient, neutralizes West Nile virus (WNV) infection at a postattachment stage in the viral life-cycle. Here, we determined the structure of WNV complexed with Fab fragments of CR4354 using cryoelectron microscopy. The outer glycoprotein shell of a mature WNV particle is formed by 30 rafts of three homodimers of the viral surface protein E. CR4354 binds to a discontinuous epitope formed by protein segments from two neighboring E molecules, but does not cause any detectable structural disturbance on the viral surface. The epitope occurs at two independent positions within an icosahedral asymmetric unit, resulting in 120 binding sites on the viral surface. The cross-linking of the six E monomers within one raft by four CR4354 Fab fragments suggests that the antibody neutralizes WNV by blocking the pH-induced rearrangement of the E protein required for virus fusion with the endosomal membrane.

Neutralization of West Nile virus by cross-linking of its surface proteins with Fab fragments of the human monoclonal antibody CR4354.,Kaufmann B, Vogt MR, Goudsmit J, Holdaway HA, Aksyuk AA, Chipman PR, Kuhn RJ, Diamond MS, Rossmann MG Proc Natl Acad Sci U S A. 2010 Nov 2;107(44):18950-5. Epub 2010 Oct 18. PMID:20956322<ref>PMID:20956322</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 3iyw" style="background-color:#fffaf0;"></div>

==See Also==
*[[Monoclonal Antibodies 3D structures|Monoclonal Antibodies 3D structures]]
== References ==
<references/>
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[[Category: Human]]
[[Category: Large Structures]]
[[Category: Wnv]]
[[Category: Kaufmann, B]]
[[Category: Rossmann, M G]]
[[Category: Envelope protein]]
[[Category: Flavivirus]]
[[Category: Icosahedral virus]]
[[Category: Neutralizing fab fragment]]
[[Category: Virus]]
[[Category: Virus-antibody complex]]
[[Category: West nile virus]]