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| | == Structural highlights == | | == Structural highlights == |
| | <table><tr><td colspan='2'>[[3okl]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3OKL OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3OKL FirstGlance]. <br> | | <table><tr><td colspan='2'>[[3okl]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3OKL OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3OKL FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ZN:ZINC+ION'>ZN</scene>, <scene name='pdbligand=KDA:(3-DEOXY-D-MANNO-OCT-2-ULOSONIC+ACID)-2-O-ALLYL'>KDA</scene>, <scene name='pdbligand=KDO:3-DEOXY-D-MANNO-OCT-2-ULOSONIC+ACID'>KDO</scene></td></tr> | + | </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='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[3okd|3okd]], [[3oke|3oke]], [[3okk|3okk]], [[3mhm|3mhm]], [[3mhn|3mhn]], [[3mho|3mho]]</div></td></tr>
| + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=KDA:(3-DEOXY-D-MANNO-OCT-2-ULOSONIC+ACID)-2-O-ALLYL'>KDA</scene>, <scene name='pdbligand=KDO:3-DEOXY-D-MANNO-OCT-2-ULOSONIC+ACID'>KDO</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</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=3okl FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3okl OCA], [https://pdbe.org/3okl PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3okl RCSB], [https://www.ebi.ac.uk/pdbsum/3okl PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3okl ProSAT]</span></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=3okl FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3okl OCA], [https://pdbe.org/3okl PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3okl RCSB], [https://www.ebi.ac.uk/pdbsum/3okl PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3okl ProSAT]</span></td></tr> |
| | </table> | | </table> |
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| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| | [[Category: Mus musculus]] | | [[Category: Mus musculus]] |
| - | [[Category: Blackler, R J]] | + | [[Category: Blackler RJ]] |
| - | [[Category: Evans, S V]] | + | [[Category: Evans SV]] |
| - | [[Category: Antibody]]
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| - | [[Category: Carbohydrate]]
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| - | [[Category: Fab]]
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| - | [[Category: Igg]]
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| - | [[Category: Immune system]]
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| Structural highlights
Publication Abstract from PubMed
The crystal structures of the antigen-binding fragment of the murine monoclonal antibody (mAb) S25-39 in the presence of several antigens representing chlamydial lipopolysaccharide (LPS) epitopes based on the bacterial sugar 3-deoxy-alpha-d-manno-oct-2-ulosonic acid (Kdo) have been determined at resolutions from 2.4 to 1.8 A. The antigen-binding site of this antibody differs from the well-characterized antibody S25-2 by a single mutation away from the germline of asparagine H53 to lysine, yet this one mutation results in a significant increase in avidity across a range of antigens. A comparison of the two antibody structures reveals that the mutated Lys H53 forms additional hydrogen bonds and/or charged-residue interactions with the second Kdo residue of every antigen having two or more carbohydrate residues. Significantly, the NH53K mutation results from a single nucleotide substitution in the germline sequence common among a panel of antibodies raised against glycoconjugates containing carbohydrate epitopes of chlamydial LPS. Like S25-2, S25-39 displays significant induced fit of complementarity determining region (CDR) H3 upon antigen binding, with the unliganded structure possessing a conformation distinct from those reported earlier for S25-2. The four different observed conformations for CDR H3 suggest that this CDR has evolved to exploit the recognition potential of a flexible loop while minimizing the associated entropic penalties of binding by adopting a limited number of ordered conformations in the unliganded state. These observations reveal strategies evolved to balance adaptability and specificity in the germline antibody response to carbohydrate antigens.
A Common NH53K Mutation in the Combining Site of Antibodies Raised against Chlamydial LPS Glycoconjugates Significantly Increases Avidity.,Blackler RJ, Muller-Loennies S, Brooks CL, Evans DW, Brade L, Kosma P, Brade H, Evans SV Biochemistry. 2011 Apr 1. PMID:21405106[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Blackler RJ, Muller-Loennies S, Brooks CL, Evans DW, Brade L, Kosma P, Brade H, Evans SV. A Common NH53K Mutation in the Combining Site of Antibodies Raised against Chlamydial LPS Glycoconjugates Significantly Increases Avidity. Biochemistry. 2011 Apr 1. PMID:21405106 doi:10.1021/bi101886v
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