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| | ==Crystal Structures of Lgr4 and its complex with R-spondin1== | | ==Crystal Structures of Lgr4 and its complex with R-spondin1== |
| - | <StructureSection load='4li2' size='340' side='right' caption='[[4li2]], [[Resolution|resolution]] 3.19Å' scene=''> | + | <StructureSection load='4li2' size='340' side='right'caption='[[4li2]], [[Resolution|resolution]] 3.19Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[4li2]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human] and [http://en.wikipedia.org/wiki/Silurana_(xenopus)_tropicalis Silurana (xenopus) tropicalis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4LI2 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4LI2 FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[4li2]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [https://en.wikipedia.org/wiki/Xenopus_tropicalis Xenopus tropicalis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4LI2 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4LI2 FirstGlance]. <br> |
| - | </td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4li1|4li1]]</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]] 3.19Å</td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">lgr4 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=8364 Silurana (Xenopus) tropicalis]), R-spondin1, RSPO1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</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=4li2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4li2 OCA], [https://pdbe.org/4li2 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4li2 RCSB], [https://www.ebi.ac.uk/pdbsum/4li2 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4li2 ProSAT]</span></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=4li2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4li2 OCA], [http://pdbe.org/4li2 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4li2 RCSB], [http://www.ebi.ac.uk/pdbsum/4li2 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4li2 ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| - | == Disease == | |
| - | [[http://www.uniprot.org/uniprot/RSPO1_HUMAN RSPO1_HUMAN]] Palmoplantar keratoderma - XX sex reversal - predisposition to squamous cell carcinoma. Keratoderma, palmoplantar, with squamous cell carcinoma of skin and sex reversal (PKKSCC) [MIM:[http://omim.org/entry/610644 610644]]: A recessive syndrome characterized by XX (female to male) SRY-independent sex reversal, palmoplantar hyperkeratosis and predisposition to squamous cell carcinoma of the skin. Note=The disease is caused by mutations affecting the gene represented in this entry. | |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/LGR4_XENTR LGR4_XENTR]] Receptor for R-spondins that potentiates the canonical Wnt signaling pathway and is involved in the formation of various organs. Upon binding to R-spondins (RSPO1, RSPO2, RSPO3 or RSPO4), associates with phosphorylated LRP6 and frizzled receptors that are activated by extracellular Wnt receptors, triggering the canonical Wnt signaling pathway to increase expression of target genes. In contrast to classical G-protein coupled receptors, does not activate heterotrimeric G-proteins to transduce the signal. Its function as activator of the Wnt signaling pathway is required for the development of various organs, including liver, kidney, intestine, bone, reproductive tract and eye. [[http://www.uniprot.org/uniprot/RSPO1_HUMAN RSPO1_HUMAN]] Activator of the beta-catenin signaling cascade, leading to TCF-dependent gene activation. Acts both in the canonical Wnt/beta-catenin-dependent pathway and in non-canonical Wnt signaling pathway, probably by acting as an inhibitor of ZNRF3, an important regulator of the Wnt signaling pathway. Acts as a ligand for frizzled FZD8 and LRP6. May negatively regulate the TGF-beta pathway. Has a essential roles in ovary determination.<ref>PMID:16109882</ref> <ref>PMID:22575959</ref> | + | [https://www.uniprot.org/uniprot/LGR4_XENTR LGR4_XENTR] Receptor for R-spondins that potentiates the canonical Wnt signaling pathway and is involved in the formation of various organs. Upon binding to R-spondins (RSPO1, RSPO2, RSPO3 or RSPO4), associates with phosphorylated LRP6 and frizzled receptors that are activated by extracellular Wnt receptors, triggering the canonical Wnt signaling pathway to increase expression of target genes. In contrast to classical G-protein coupled receptors, does not activate heterotrimeric G-proteins to transduce the signal. Its function as activator of the Wnt signaling pathway is required for the development of various organs, including liver, kidney, intestine, bone, reproductive tract and eye. |
| | <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: Human]] | + | [[Category: Homo sapiens]] |
| - | [[Category: Rajashankar, K]] | + | [[Category: Large Structures]] |
| - | [[Category: Robev, D]] | + | [[Category: Xenopus tropicalis]] |
| - | [[Category: Xu, Y]] | + | [[Category: Rajashankar K]] |
| - | [[Category: Hormone receptor-signaling protein complex]] | + | [[Category: Robev D]] |
| - | [[Category: Lrr]] | + | [[Category: Xu Y]] |
| Structural highlights
Function
LGR4_XENTR Receptor for R-spondins that potentiates the canonical Wnt signaling pathway and is involved in the formation of various organs. Upon binding to R-spondins (RSPO1, RSPO2, RSPO3 or RSPO4), associates with phosphorylated LRP6 and frizzled receptors that are activated by extracellular Wnt receptors, triggering the canonical Wnt signaling pathway to increase expression of target genes. In contrast to classical G-protein coupled receptors, does not activate heterotrimeric G-proteins to transduce the signal. Its function as activator of the Wnt signaling pathway is required for the development of various organs, including liver, kidney, intestine, bone, reproductive tract and eye.
Publication Abstract from PubMed
The leucine-rich repeat-containing G-protein-coupled receptors (Lgrs) are a large membrane protein family mediating signaling events during development and in the adult organism. Type 2 Lgrs, including Lgr4, Lgr5, and Lgr6, play crucial roles in embryonic development and in several cancers. They also regulate adult stem cell maintenance via direct association with proteins in the Wnt signaling pathways, including Lrp5/6 and frizzled receptors. The R-spondins (Rspo) were recently identified as functional ligands for type 2 Lgrs and were shown to synergize with both canonical and noncanonical Wnt signaling pathways. We determined and report the structure of the Lgr4 ectodomain alone and bound to Rspo1. The structures reveal an extended horseshoe leucine-rich repeat (LRR) receptor architecture that binds, with its concave side, the ligand furin-like repeats via an intimate interface. The molecular details of ligand/receptor recognition provide insight into receptor activation and could serve as template for stem-cell-based regenerative therapeutics development.
Crystal Structures of Lgr4 and Its Complex with R-Spondin1.,Xu K, Xu Y, Rajashankar KR, Robev D, Nikolov DB Structure. 2013 Jul 23. pii: S0969-2126(13)00242-6. doi:, 10.1016/j.str.2013.07.001. PMID:23891289[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Xu K, Xu Y, Rajashankar KR, Robev D, Nikolov DB. Crystal Structures of Lgr4 and Its Complex with R-Spondin1. Structure. 2013 Jul 23. pii: S0969-2126(13)00242-6. doi:, 10.1016/j.str.2013.07.001. PMID:23891289 doi:10.1016/j.str.2013.07.001
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