4w2q: Difference between revisions
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The | ==Anti-Marburgvirus Nucleoprotein Single Domain Antibody C Complexed with Nucleoprotein C-terminal domain== | ||
<StructureSection load='4w2q' size='340' side='right'caption='[[4w2q]], [[Resolution|resolution]] 2.70Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[4w2q]] is a 8 chain structure with sequence from [https://en.wikipedia.org/wiki/Lama_glama Lama glama] and [https://en.wikipedia.org/wiki/Marburg_virus_-_Musoke,_Kenya,_1980 Marburg virus - Musoke, Kenya, 1980]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4W2Q OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4W2Q 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]] 2.7Å</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=4w2q FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4w2q OCA], [https://pdbe.org/4w2q PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4w2q RCSB], [https://www.ebi.ac.uk/pdbsum/4w2q PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4w2q ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/NCAP_MABVM NCAP_MABVM] Encapsidates the genome, protecting it from nucleases. The encapsidated genomic RNA is termed the nucleocapsid and serves as template for transcription and replication. During replication, encapsidation by NP is coupled to RNA synthesis and all replicative products are resistant to nucleases (By similarity). | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Marburg virus (MARV) is a highly lethal hemorrhagic fever virus that is increasingly re-emerging in Africa, has been imported to both Europe and the US, and is also a Tier 1 bioterror threat. As a negative sense RNA virus, MARV has error prone replication which can yield progeny capable of evading countermeasures. To evaluate this vulnerability, we sought to determine the epitopes of 4 llama single-domain antibodies (sdAbs or VHH) specific for nucleoprotein (NP), each capable of forming MARV monoclonal affinity reagent sandwich assays. Here, we show that all sdAb bound the C-terminal region of NP, which was produced recombinantly to derive X-ray crystal structures of the three best performing antibody-antigen complexes. The common epitope is a trio of alpha helices that form a novel asymmetric basin-like depression that accommodates each sdAb paratope via substantial complementarity-determining region (CDR) restructuring. Shared core contacts were complemented by unique accessory contacts on the sides and overlooks of the basin yielding very different approach routes for each sdAb to bind the antigen. The C-terminal region of MARV NP was unable to be crystallized alone and required engagement with sdAb to form crystals suggesting the antibodies acted as crystallization chaperones. While gross structural homology is apparent between the two most conserved helices of MARV and Ebolavirus, the positions and morphologies of the resulting basins were markedly different. Naturally occurring amino acid variations occurring in bat and human Marburgvirus strains all mapped to surfaces distant from the predicted sdAb contacts suggesting a vital role for the NP interface in virus replication. As an essential internal structural component potentially interfacing with a partner protein it is likely the C-terminal epitope remains hidden or "cryptic" until virion disruption occurs. Conservation of this epitope over 50 years of Marburgvirus evolution should make these sdAb useful foundations for diagnostics and therapeutics resistant to drift. | |||
Unveiling a Drift Resistant Cryptotope within Marburgvirus Nucleoprotein Recognized by Llama Single-Domain Antibodies.,Garza JA, Taylor AB, Sherwood LJ, Hart PJ, Hayhurst A Front Immunol. 2017 Oct 2;8:1234. doi: 10.3389/fimmu.2017.01234. eCollection, 2017. PMID:29038656<ref>PMID:29038656</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
[[Category: | </div> | ||
[[Category: Garza | <div class="pdbe-citations 4w2q" style="background-color:#fffaf0;"></div> | ||
[[Category: Taylor | |||
==See Also== | |||
*[[Antibody 3D structures|Antibody 3D structures]] | |||
*[[Nucleoprotein 3D structures|Nucleoprotein 3D structures]] | |||
*[[3D structures of non-human antibody|3D structures of non-human antibody]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Lama glama]] | |||
[[Category: Large Structures]] | |||
[[Category: Marburg virus - Musoke, Kenya, 1980]] | |||
[[Category: Garza JA]] | |||
[[Category: Taylor AB]] | |||