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==Crystal structure of Fab fragment of Anti-HCV E2 antibody (HC84.26)== | |||
<StructureSection load='6x9x' size='340' side='right'caption='[[6x9x]], [[Resolution|resolution]] 1.80Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[6x9x]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6X9X OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6X9X 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]] 1.8Å</td></tr> | |||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</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=6x9x FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6x9x OCA], [https://pdbe.org/6x9x PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6x9x RCSB], [https://www.ebi.ac.uk/pdbsum/6x9x PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6x9x ProSAT]</span></td></tr> | |||
</table> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
We determined the crystal structure to 1.8 A resolution of the Fab fragment of an affinity-matured human monoclonal antibody (HC84.26.5D) that recognizes the E2 envelope glycoprotein of hepatitis C virus (HCV). Unlike conventional Fabs, which are monovalent monomers, Fab HC84.26.5D assembles into a bivalent domain-swapped dimer in which the two V(L)/V(H) modules are separated by ~25 A. In solution, Fab HC84.26.5D exists predominantly as a dimer (~80%) in equilibrium with the monomeric form of the Fab (~20%). Dimerization is mediated entirely by deletion of a single residue, V(H)Ser113 (Kabat numbering), in the elbow region linking the V(H) and C(H)1 domains. In agreement with the crystal structure, dimeric Fab HC84.26.5D is able to bind two HCV E2 molecules in solution. This is only the second example of a domain-swapped Fab dimer from among >3000 Fab crystal structures determined to date. Moreover, the architecture of the doughnut-shaped Fab HC84.26.5D dimer is completely different from that of the previously reported Fab 2G12 dimer. We demonstrate that the highly identifiable shape of dimeric Fab HC84.26.5D makes it useful as a fiducial marker for single-particle cryoEM analysis of HCV E2. Bivalent domain-swapped Fab dimers engineered on the basis of HC84.26.5D may also serve as a means of doubling the effective size of conventional Fab-protein complexes for cryoEM. | |||
Crystal Structure of a Bivalent Antibody Fab Fragment.,Shahid S, Gao M, Travis Gallagher D, Pozharski E, Brinson RG, Keck ZY, Foung SKH, Fuerst TR, Mariuzza RA J Mol Biol. 2021 Jan 22;433(2):166714. doi: 10.1016/j.jmb.2020.11.013. Epub 2020 , Nov 19. PMID:33220264<ref>PMID:33220264</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
[[Category: | </div> | ||
[[Category: Mariuzza | <div class="pdbe-citations 6x9x" style="background-color:#fffaf0;"></div> | ||
[[Category: Shahid | |||
==See Also== | |||
*[[Monoclonal Antibodies 3D structures|Monoclonal Antibodies 3D structures]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Homo sapiens]] | |||
[[Category: Large Structures]] | |||
[[Category: Mariuzza RA]] | |||
[[Category: Shahid S]] | |||
Latest revision as of 17:47, 18 October 2023
Crystal structure of Fab fragment of Anti-HCV E2 antibody (HC84.26)Crystal structure of Fab fragment of Anti-HCV E2 antibody (HC84.26)
Structural highlights
Publication Abstract from PubMedWe determined the crystal structure to 1.8 A resolution of the Fab fragment of an affinity-matured human monoclonal antibody (HC84.26.5D) that recognizes the E2 envelope glycoprotein of hepatitis C virus (HCV). Unlike conventional Fabs, which are monovalent monomers, Fab HC84.26.5D assembles into a bivalent domain-swapped dimer in which the two V(L)/V(H) modules are separated by ~25 A. In solution, Fab HC84.26.5D exists predominantly as a dimer (~80%) in equilibrium with the monomeric form of the Fab (~20%). Dimerization is mediated entirely by deletion of a single residue, V(H)Ser113 (Kabat numbering), in the elbow region linking the V(H) and C(H)1 domains. In agreement with the crystal structure, dimeric Fab HC84.26.5D is able to bind two HCV E2 molecules in solution. This is only the second example of a domain-swapped Fab dimer from among >3000 Fab crystal structures determined to date. Moreover, the architecture of the doughnut-shaped Fab HC84.26.5D dimer is completely different from that of the previously reported Fab 2G12 dimer. We demonstrate that the highly identifiable shape of dimeric Fab HC84.26.5D makes it useful as a fiducial marker for single-particle cryoEM analysis of HCV E2. Bivalent domain-swapped Fab dimers engineered on the basis of HC84.26.5D may also serve as a means of doubling the effective size of conventional Fab-protein complexes for cryoEM. Crystal Structure of a Bivalent Antibody Fab Fragment.,Shahid S, Gao M, Travis Gallagher D, Pozharski E, Brinson RG, Keck ZY, Foung SKH, Fuerst TR, Mariuzza RA J Mol Biol. 2021 Jan 22;433(2):166714. doi: 10.1016/j.jmb.2020.11.013. Epub 2020 , Nov 19. PMID:33220264[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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