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| | ==Xenopus laevis embryonic epidermal lectin in complex with glycerol phosphate== | | ==Xenopus laevis embryonic epidermal lectin in complex with glycerol phosphate== |
| - | <StructureSection load='4wn0' size='340' side='right' caption='[[4wn0]], [[Resolution|resolution]] 2.20Å' scene=''> | + | <StructureSection load='4wn0' size='340' side='right'caption='[[4wn0]], [[Resolution|resolution]] 2.20Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[4wn0]] is a 1 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4WN0 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4WN0 FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[4wn0]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Xenopus_laevis Xenopus laevis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4WN0 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4WN0 FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=1PE:PENTAETHYLENE+GLYCOL'>1PE</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=G3P:SN-GLYCEROL-3-PHOSPHATE'>G3P</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.2Å</td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4wmo|4wmo]]</td></tr>
| + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=1PE:PENTAETHYLENE+GLYCOL'>1PE</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=G3P:SN-GLYCEROL-3-PHOSPHATE'>G3P</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene></td></tr> |
| - | <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=4wn0 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4wn0 OCA], [http://pdbe.org/4wn0 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4wn0 RCSB], [http://www.ebi.ac.uk/pdbsum/4wn0 PDBsum]</span></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=4wn0 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4wn0 OCA], [https://pdbe.org/4wn0 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4wn0 RCSB], [https://www.ebi.ac.uk/pdbsum/4wn0 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4wn0 ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | + | == Function == |
| | + | [https://www.uniprot.org/uniprot/ITLN1_XENLA ITLN1_XENLA] Lectin that specifically recognizes microbial carbohydrate chains in a calcium-dependent manner (PubMed:26755729). Binds to microbial glycans that contain a terminal acyclic 1,2-diol moiety, including beta-linked D-galactofuranose (beta-Galf) and D-phosphoglycerol-modified glycans (PubMed:26755729). Binds to S.pneumoniae serotypes with glycans that contain beta-linked D-galactofuranose (beta-Galf) and with D-phosphoglycerol-modified glycans (PubMed:26755729). Can bind a variety of monosaccharides (in vitro) (PubMed:15537792). Probably plays a role in the defense system against microorganisms (Probable).<ref>PMID:15537792</ref> <ref>PMID:26755729</ref> |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Forest, K T]] | + | [[Category: Large Structures]] |
| - | [[Category: Kiessling, L L]] | + | [[Category: Xenopus laevis]] |
| - | [[Category: Wangkanont, K]] | + | [[Category: Forest KT]] |
| - | [[Category: Calcium]] | + | [[Category: Kiessling LL]] |
| - | [[Category: Carbohydrate-binding protein]] | + | [[Category: Wangkanont K]] |
| - | [[Category: Fibrinogen-like domain]]
| + | |
| - | [[Category: Glycerol phosphate]]
| + | |
| - | [[Category: Innate immunity]]
| + | |
| - | [[Category: Lectin]]
| + | |
| - | [[Category: Microbial epitope]]
| + | |
| - | [[Category: Sugar binding protein]]
| + | |
| - | [[Category: Trimer]]
| + | |
| - | [[Category: X-type lectin]]
| + | |
| Structural highlights
Function
ITLN1_XENLA Lectin that specifically recognizes microbial carbohydrate chains in a calcium-dependent manner (PubMed:26755729). Binds to microbial glycans that contain a terminal acyclic 1,2-diol moiety, including beta-linked D-galactofuranose (beta-Galf) and D-phosphoglycerol-modified glycans (PubMed:26755729). Binds to S.pneumoniae serotypes with glycans that contain beta-linked D-galactofuranose (beta-Galf) and with D-phosphoglycerol-modified glycans (PubMed:26755729). Can bind a variety of monosaccharides (in vitro) (PubMed:15537792). Probably plays a role in the defense system against microorganisms (Probable).[1] [2]
Publication Abstract from PubMed
Intelectins (X-type lectins) are broadly distributed throughout chordates, and they have been implicated in innate immunity. Xenopus laevis embryonic epidermal lectin (XEEL), an intelectin secreted into environmental water by the X. laevis embryo, is postulated to function as a defense against microbes. XEEL is homologous (64% identical) to human intelectin-1 (hIntL-1), which is also implicated in innate immune defense. We previously showed that hIntL-1 binds microbial glycans bearing exocyclic vicinal diol groups. It is unknown whether XEEL has the same ligand specificity. Also unclear is whether XEEL and hIntL-1 have similar quaternary structures, as XEEL lacks the corresponding cysteine residues in hIntL-1 that stabilize the disulfide-linked trimer. These observations prompted us to further characterize XEEL. We found that hIntL-1 and XEEL have similar structural features. Even without the corresponding intermolecular disulfide bonds present in hIntL-1, the carbohydrate recognition domain of XEEL (XEELCRD) forms a stable trimer in solution. The structure of XEELCRD in complex with D-glycerol-1-phosphate, a residue present in microbe-specific glycans, indicated the exocyclic vicinal diol coordinates to a protein-bound calcium ion. This ligand-binding mode is conserved between XEEL and hIntL-1. The domain architecture of full length XEEL is reminiscent of a barbell, with two sets of three glycan-binding sites directed in opposite directions. This orientation is consistent with our observation that XEEL can promote the agglutination of specific serotypes of Streptococcus pneumoniae. These data support a role for XEEL in innate immunity, and they highlight structural and functional conservation of X-type lectins among chordates.
Structures of Xenopus embryonic epidermal lectin reveal a conserved mechanism of microbial glycan recognition.,Wangkanont K, Wesener DA, Vidani JA, Kiessling LL, Forest KT J Biol Chem. 2016 Jan 11. pii: jbc.M115.709212. PMID:26755729[3]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Nagata S. Isolation, characterization, and extra-embryonic secretion of the Xenopus laevis embryonic epidermal lectin, XEEL. Glycobiology. 2005 Mar;15(3):281-90. doi: 10.1093/glycob/cwi010. Epub 2004 Nov, 10. PMID:15537792 doi:http://dx.doi.org/10.1093/glycob/cwi010
- ↑ Wangkanont K, Wesener DA, Vidani JA, Kiessling LL, Forest KT. Structures of Xenopus embryonic epidermal lectin reveal a conserved mechanism of microbial glycan recognition. J Biol Chem. 2016 Jan 11. pii: jbc.M115.709212. PMID:26755729 doi:http://dx.doi.org/10.1074/jbc.M115.709212
- ↑ Wangkanont K, Wesener DA, Vidani JA, Kiessling LL, Forest KT. Structures of Xenopus embryonic epidermal lectin reveal a conserved mechanism of microbial glycan recognition. J Biol Chem. 2016 Jan 11. pii: jbc.M115.709212. PMID:26755729 doi:http://dx.doi.org/10.1074/jbc.M115.709212
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