View source for 1m7i


==CRYSTAL STRUCTURE OF A MONOCLONAL FAB SPECIFIC FOR SHIGELLA FLEXNERI Y LIPOPOLYSACCHARIDE COMPLEXED WITH A PENTASACCHARIDE==
<StructureSection load='1m7i' size='340' side='right'caption='[[1m7i]], [[Resolution|resolution]] 2.50&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1m7i]] 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=1M7I OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1M7I 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]] 2.5&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=RAM:ALPHA-L-RHAMNOSE'>RAM</scene>, <scene name='pdbligand=RAO:1-O-METHYL-ALPHA-RHAMNOSE'>RAO</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=1m7i FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1m7i OCA], [https://pdbe.org/1m7i PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1m7i RCSB], [https://www.ebi.ac.uk/pdbsum/1m7i PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1m7i ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/A2NHM3_MOUSE A2NHM3_MOUSE] 
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/m7/1m7i_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1m7i ConSurf].
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== Publication Abstract from PubMed ==
The antigenic recognition of Shigella flexneri O-polysaccharide, which consists of a repeating unit ABCD [--&gt;2)-alpha-L-Rhap-(1--&gt;2)-alpha-L-Rhap-(1--&gt;3)-alpha-L-Rhap-(1--&gt;3)-beta -D-GlcpNAc-(1--&gt;], by the monoclonal antibody SYA/J6 (IgG3, kappa) has been investigated by crystallographic analysis of the Fab domain and its two complexes with two antigen segments (a pentasaccharide Rha A-Rha B-Rha C-GlcNAc D-Rha A' and a modified trisaccharide Rha B-Rha C-GlcNAc D in which Rha C* is missing a C2-OH group). These complex structures, the first for a Fab specific for a periodic linear heteropolysaccharide, reveal a binding site groove (between the V(H) and V(L) domains) that makes polar and nonpolar contacts with all the sugar residues of the pentasaccharide. Both main-chain and side-chain atoms of the Fab are used in ligand binding. The charged side chain of Glu H50 of CDR H2 forms crucial hydrogen bonds to GlcNAc of the oligosaccharides. The modified trisaccharide is more buried and fits more snugly than the pentasaccharide. It also makes as many contacts (approximately 75) with the Fab as the pentasaccharide, including the same number of hydrogen bonds (eight, with four being identical). It is further engaged in more hydrophobic interactions than the pentasaccharide. These three features favorable to trisaccharide binding are consistent with the observation of a tighter complex with the trisaccharide than the pentasaccharide. Thermodynamic data demonstrate that the native tri- to pentasaccharides have free energies of binding in the range of 6.8-7.4 kcal mol(-1), and all but one of the hydrogen bonds to individual hydroxyl groups provide no more than approximately 0.7 kcal mol(-1). They further indicate that hydrophobic interactions make significant contributions to binding and, as the native epitope becomes larger across the tri-, tetra-, pentasaccharide series, entropy contributions to the free energy become dominant.

Molecular recognition of oligosaccharide epitopes by a monoclonal Fab specific for Shigella flexneri Y lipopolysaccharide: X-ray structures and thermodynamics.,Vyas NK, Vyas MN, Chervenak MC, Johnson MA, Pinto BM, Bundle DR, Quiocho FA Biochemistry. 2002 Nov 19;41(46):13575-86. PMID:12427018<ref>PMID:12427018</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 1m7i" style="background-color:#fffaf0;"></div>

==See Also==
*[[Monoclonal Antibodies 3D structures|Monoclonal Antibodies 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Mus musculus]]
[[Category: Bundle DR]]
[[Category: Chervenak MC]]
[[Category: Johnson MA]]
[[Category: Pinto BM]]
[[Category: Quiocho FA]]
[[Category: Vyas MN]]
[[Category: Vyas NK]]