View source for 2zmk


==Crystl structure of Basic Winged bean lectin in complex with Gal-alpha-1,4-Gal-Beta-Ethylene==
<StructureSection load='2zmk' size='340' side='right'caption='[[2zmk]], [[Resolution|resolution]] 2.50&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2zmk]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Psophocarpus_tetragonolobus Psophocarpus tetragonolobus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2ZMK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2ZMK 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=BMA:BETA-D-MANNOSE'>BMA</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=EGA:ETHYL+BETA-D-GALACTOPYRANOSIDE'>EGA</scene>, <scene name='pdbligand=FUC:ALPHA-L-FUCOSE'>FUC</scene>, <scene name='pdbligand=GLA:ALPHA+D-GALACTOSE'>GLA</scene>, <scene name='pdbligand=MN:MANGANESE+(II)+ION'>MN</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</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=2zmk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2zmk OCA], [https://pdbe.org/2zmk PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2zmk RCSB], [https://www.ebi.ac.uk/pdbsum/2zmk PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2zmk ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/LEC1_PSOTE LEC1_PSOTE] Lectin.
== 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/zm/2zmk_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.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=2zmk ConSurf].
<div style="clear:both"></div>
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== Publication Abstract from PubMed ==
Crystal structures of the complexes of basic winged-bean agglutinin with the disaccharides Galalpha1-4Gal (galabiose), Galalpha1-6Glc (mellibiose) and Galalpha1-4Galbeta-Et have been determined and the complex with Galalpha1-2Gal has been modelled. The interactions of the nonreducing Gal with the lectin at the primary site are the same as those in the known complexes with disaccharides having the alpha1--&gt;3 linkage. The second residue in Galalpha1-4Gal and Galalpha1-6Glc forms a water bridge to the lectin, while the ethyl group in Galalpha1-4Galbeta-Et makes nonpolar interactions. In complexes involving disaccharides with alpha1-3 linkages, which form part of the A and B blood-group substances, the second sugar residue forms a direct hydrogen bond to the variable loop in the binding site of the lectin. This in part explains the specificity of the lectin for the blood-group substances and also the higher affinity of alpha1--&gt;3-linked disaccharides for the lectin compared with disaccharides involving other linkages. Including those reported here, 14 crystal structures involving the lectin, accounting for 54 crystallographically independent subunits, are available. A comparative study of these structures shows that the region involving the curved beta-sheet which nestles the metal ions is relatively rigid. The carbohydrate-binding region is perched on this region. The flat beta-sheet, which is involved in oligomerization and exhibits considerable variability in legume lectins, is relatively flexible. Indeed, the structures of basic winged-bean lectin have been of critical importance in establishing legume lectins as a family of proteins in which small alterations in essentially the same tertiary structure lead to large variations in quaternary association. They have also provided a structural explanation of the blood-group specificity of the lectin.

Structure and sugar-specificity of basic winged-bean lectin: structures of new disaccharide complexes and a comparative study with other known disaccharide complexes of the lectin.,Kulkarni KA, Katiyar S, Surolia A, Vijayan M, Suguna K Acta Crystallogr D Biol Crystallogr. 2008 Jul;D64(Pt 7):730-7. Epub 2008, Jun 18. PMID:18566508<ref>PMID:18566508</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 2zmk" style="background-color:#fffaf0;"></div>

==See Also==
*[[Agglutinin 3D structures|Agglutinin 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Psophocarpus tetragonolobus]]
[[Category: Katiyar S]]
[[Category: Kulkarni KA]]
[[Category: Surolia A]]
[[Category: Vijayan M]]