View source for 2wn2


==Structure of the discoidin I from Dictyostelium discoideum in complex with galactose beta 1-3 galNAc at 1.8 A resolution.==
<StructureSection load='2wn2' size='340' side='right'caption='[[2wn2]], [[Resolution|resolution]] 1.82&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2wn2]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Dictyostelium_discoideum_AX2 Dictyostelium discoideum AX2]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2WN2 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2WN2 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]] 1.82&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=1PG:2-(2-{2-[2-(2-METHOXY-ETHOXY)-ETHOXY]-ETHOXY}-ETHOXY)-ETHANOL'>1PG</scene>, <scene name='pdbligand=A2G:N-ACETYL-2-DEOXY-2-AMINO-GALACTOSE'>A2G</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=GAL:BETA-D-GALACTOSE'>GAL</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=NGA:N-ACETYL-D-GALACTOSAMINE'>NGA</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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=2wn2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2wn2 OCA], [https://pdbe.org/2wn2 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2wn2 RCSB], [https://www.ebi.ac.uk/pdbsum/2wn2 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2wn2 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/DIS1A_DICDI DIS1A_DICDI] 
== 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/wn/2wn2_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=2wn2 ConSurf].
<div style="clear:both"></div>
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== Publication Abstract from PubMed ==
Discoidin I (DiscI) and discoidin II (DiscII) are N-acetylgalactosamine (GalNAc)-binding proteins from Dictyostelium discoideum. They consist of two domains: an N-terminal discoidin domain and a C-terminal H-type lectin domain. They were cloned and expressed in high yield in recombinant form in Escherichia coli. Although both lectins bind galactose (Gal) and GalNAc, glycan array experiments performed on the recombinant proteins displayed strong differences in their specificity for oligosaccharides. DiscI and DiscII bind preferentially to Gal/GalNAcbeta1-3Gal/GalNAc-containing and Gal/GalNAcbeta1-4GlcNAcbeta1-6Gal/GalNAc-containing glycans, respectively. The affinity of the interaction of DiscI with monosaccharides and disaccharides was evaluated using isothermal titration calorimetry experiments. The three-dimensional structures of native DiscI and its complexes with GalNAc, GalNAcbeta1-3Gal, and Galbeta1-3GalNAc were solved by X-ray crystallography. DiscI forms trimers with involvement of calcium at the monomer interface. The N-terminal discoidin domain presents a structural similarity to F-type lectins such as the eel agglutinin, where an amphiphilic binding pocket suggests possible carbohydrate-binding activity. In the C-terminal H-type lectin domain, the GalNAc residue establishes specific hydrogen bonds that explain the observed affinity (K(d)=3x10(-4) M). The different specificities of DiscI and DiscII for oligosaccharides were rationalized from the different structures obtained by either X-ray crystallography or molecular modeling.

Discoidin I from Dictyostelium discoideum and Interactions with oligosaccharides: specificity, affinity, crystal structures, and comparison with discoidin II.,Mathieu SV, Aragao KS, Imberty A, Varrot A J Mol Biol. 2010 Jul 16;400(3):540-54. Epub 2010 May 24. PMID:20580724<ref>PMID:20580724</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 2wn2" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Dictyostelium discoideum AX2]]
[[Category: Large Structures]]
[[Category: Imberty A]]
[[Category: Mathieu S]]
[[Category: Varrot A]]