6a1t

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==Charcot-Leyden crystal protein/Galectin-10 variant E33A with lactose==
==Charcot-Leyden crystal protein/Galectin-10 variant E33A with lactose==
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<StructureSection load='6a1t' size='340' side='right' caption='[[6a1t]], [[Resolution|resolution]] 1.97&Aring;' scene=''>
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<StructureSection load='6a1t' size='340' side='right'caption='[[6a1t]], [[Resolution|resolution]] 1.97&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
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<table><tr><td colspan='2'>[[6a1t]] is a 1 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6A1T OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6A1T FirstGlance]. <br>
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<table><tr><td colspan='2'>[[6a1t]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6A1T OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6A1T FirstGlance]. <br>
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</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=LAT:BETA-LACTOSE'>LAT</scene></td></tr>
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.97&#8491;</td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6a1t FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6a1t OCA], [http://pdbe.org/6a1t PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6a1t RCSB], [http://www.ebi.ac.uk/pdbsum/6a1t PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6a1t ProSAT]</span></td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BGC:BETA-D-GLUCOSE'>BGC</scene>, <scene name='pdbligand=GAL:BETA-D-GALACTOSE'>GAL</scene>, <scene name='pdbligand=PRD_900004:beta-lactose'>PRD_900004</scene></td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=6a1t FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6a1t OCA], [https://pdbe.org/6a1t PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6a1t RCSB], [https://www.ebi.ac.uk/pdbsum/6a1t PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6a1t ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
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[[http://www.uniprot.org/uniprot/LEG10_HUMAN LEG10_HUMAN]] Regulates immune responses through the recognition of cell-surface glycans. Essential for the anergy and suppressive function of CD25-positive regulatory T-cells (Treg).<ref>PMID:17502455</ref>
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[https://www.uniprot.org/uniprot/LEG10_HUMAN LEG10_HUMAN] Regulates immune responses through the recognition of cell-surface glycans. Essential for the anergy and suppressive function of CD25-positive regulatory T-cells (Treg).<ref>PMID:17502455</ref>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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Charcot-Leyden crystal protein/Gal-10, abundantly expressed in eosinophils and basophils, is related to several immune diseases. Recently, crystallographic and biochemical studies showed that Gal-10 cannot bind lactose, because a glutamate residue (Glu33) from another monomer blocks the binding site. Moreover, Gal-10 actually forms a novel dimeric structure compared to other galectins. To investigate the role that Glu33 plays in inhibiting lactose binding, we mutated this residue to glutamine, aspartate, and alanine. The structure of E33A shows that Gal-10 can now bind lactose. In the hemagglutination assay, lactose could inhibit E33A from inducing chicken erythrocyte agglutination. Furthermore, we identified a tryptophan residue (Trp127) at the interface of homodimer that is crucial for Gal-10 dimerization. The variant W127A, which exists as a monomer, exhibited higher hemagglutination activity than wild type Gal-10. The solid phase assay also showed that W127A could bind to lactose-modified sepharose-6B, whereas wild type Gal-10 could not. This indicates that the open carbohydrate-binding site of the W127A monomer can bind to lactose. In addition, the distribution of EGFP-tagged Gal-10 and its variants in HeLa cells was investigated. Because Trp72 is the highly conserved in the ligand binding sites of galectins, we used EGFP-tagged W72A to show that Gal-10 could not be transported into the nucleus, indicating that Trp72 is crucial for Gal-10 transport into that organelle.
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Identification of key amino acid residues determining ligand binding specificity, homodimerization and cellular distribution of human galectin-10.,Su J, Song C, Si Y, Cui L, Yang T, Li Y, Wang H, Tai G, Zhou Y Glycobiology. 2019 Jan 1;29(1):85-93. doi: 10.1093/glycob/cwy087. PMID:30239701<ref>PMID:30239701</ref>
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==See Also==
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*[[Galectin 3D structures|Galectin 3D structures]]
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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<div class="pdbe-citations 6a1t" style="background-color:#fffaf0;"></div>
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== References ==
== References ==
<references/>
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
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[[Category: Su, J]]
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[[Category: Homo sapiens]]
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[[Category: Protein binding]]
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[[Category: Large Structures]]
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[[Category: Su J]]

Current revision

Charcot-Leyden crystal protein/Galectin-10 variant E33A with lactose

PDB ID 6a1t

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