View source for 2cgz


==Structure of Helix Pomatia agglutinin with Tn antigen==
<StructureSection load='2cgz' size='340' side='right'caption='[[2cgz]], [[Resolution|resolution]] 2.80&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2cgz]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Helix_pomatia Helix pomatia]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2CGZ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2CGZ 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]] 2.8&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=A2G:N-ACETYL-2-DEOXY-2-AMINO-GALACTOSE'>A2G</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=SER:SERINE'>SER</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=2cgz FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2cgz OCA], [https://pdbe.org/2cgz PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2cgz RCSB], [https://www.ebi.ac.uk/pdbsum/2cgz PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2cgz ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/Q2F1K8_HELPO Q2F1K8_HELPO] 
== 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/cg/2cgz_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=2cgz ConSurf].
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== Publication Abstract from PubMed ==
Helix pomatia agglutinin (HPA) is a lectin that has been used extensively in histopathology, since its binding to tissue sections from breast and colon cancers is correlated with the worst prognosis for the patients. The lectin recognizes alpha-d-N-acetylgalactosamine (alphaGalNAc) containing epitopes which are only present in cancer cell lines having a high likelihood to undergo metastasis, such as the HT29 cancer colon cell line. Several breast cancer cell lines have also been shown to be labeled, although IGROV1, an ovarian cancer cell line, is not. Inhibition studies, using GalNAc monosaccharides, are reported here, showing that the labeling is dependent upon the presence of carbohydrate epitopes. The crystal structures of the lectin complexed with two GalNAc containing epitopes associated with cancer, the Tn (alphaGalNAc-Ser) and Forssman (alphaGalNAc1-3GalNAc) antigens, show the lectin's specificity for GalNAc is due to a particular network of hydrogen bonds. A histidine residue makes hydrophobic contact with the aglycon, rationalizing the preference for GalNAc bearing an additional sugar or amino acid in the alpha position. These structures provide the molecular basis for the use of HPA in metastasis research.

Structural basis for recognition of breast and colon cancer epitopes Tn antigen and Forssman disaccharide by Helix pomatia lectin.,Lescar J, Sanchez JF, Audfray A, Coll JL, Breton C, Mitchell EP, Imberty A Glycobiology. 2007 Oct;17(10):1077-83. Epub 2007 Jul 25. PMID:17652409<ref>PMID:17652409</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 2cgz" style="background-color:#fffaf0;"></div>

==See Also==
*[[Agglutinin 3D structures|Agglutinin 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Helix pomatia]]
[[Category: Large Structures]]
[[Category: Audfray A]]
[[Category: Breton C]]
[[Category: Chazalet V]]
[[Category: Gagnon J]]
[[Category: Gautier C]]
[[Category: Imberty A]]
[[Category: Lescar J]]
[[Category: Mitchell EP]]
[[Category: Sanchez J-F]]