View source for 4q56


==Structure of Helix aspersa agglutinin with natural glycosylation and N-acetyl-alpha-D-galactosamine (GalNAc)==
<StructureSection load='4q56' size='340' side='right'caption='[[4q56]], [[Resolution|resolution]] 1.38&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4q56]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Cornu_aspersum Cornu aspersum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4Q56 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4Q56 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]] 1.38&#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=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=BMA:BETA-D-MANNOSE'>BMA</scene>, <scene name='pdbligand=FUC:ALPHA-L-FUCOSE'>FUC</scene>, <scene name='pdbligand=GAL:BETA-D-GALACTOSE'>GAL</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=PCA:PYROGLUTAMIC+ACID'>PCA</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=4q56 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4q56 OCA], [https://pdbe.org/4q56 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4q56 RCSB], [https://www.ebi.ac.uk/pdbsum/4q56 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4q56 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/A0A0R4I963_CORAP A0A0R4I963_CORAP] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Lectins belong to a differentiated group of proteins known to possess sugar-binding properties. Due to this fact, they are interesting research targets in medical diagnostics. Helix aspersa agglutinin (HAA) is a lectin that recognizes the epitopes containing alpha-d-N-acetylgalactosamine (GalNAc), which is present at the surface of metastatic cancer cells. Although several reports have already described the use of HAA as a diagnostic tool, this protein was not characterized on the molecular level. Here, we present for the first time the structural information about lectin isolated from mucus of Helix aspersa (garden snail). The amino acid sequence of this agglutinin was determined by Edman degradation and tertiary as well as quaternary structure by X-ray crystallography. The high resolution crystal structure (1.38A) and MALDI-TOF mass spectrometry analysis provide the detailed information about a large part of the HAA natural glycan chain. The topology of the GalNAc binding cleft and interaction with lectin are very well defined in the structure and fully confirmed by STD HSQC NMR spectroscopy. Together, this provides structural clues regarding HAA specificity and opens possibilities to rational modifications of this important diagnostic tool.

Structural studies of Helix aspersa agglutinin complexed with GalNAc: A lectin that serves as a diagnostic tool.,Pietrzyk AJ, Bujacz A, Mak P, Potempa B, Niedziela T Int J Biol Macromol. 2015 Sep 28;81:1059-1068. doi:, 10.1016/j.ijbiomac.2015.09.044. PMID:26416237<ref>PMID:26416237</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4q56" style="background-color:#fffaf0;"></div>

==See Also==
*[[Agglutinin 3D structures|Agglutinin 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Cornu aspersum]]
[[Category: Large Structures]]
[[Category: Bujacz A]]
[[Category: Bujacz G]]
[[Category: Pietrzyk AJ]]