7ysw

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== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[7ysw]] is a 4 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=7YSW OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7YSW FirstGlance]. <br>
<table><tr><td colspan='2'>[[7ysw]] is a 4 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=7YSW OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7YSW FirstGlance]. <br>
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</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CU:COPPER+(II)+ION'>CU</scene>, <scene name='pdbligand=IDS:2-O-SULFO-ALPHA-L-IDOPYRANURONIC+ACID'>IDS</scene>, <scene name='pdbligand=SGN:N,O6-DISULFO-GLUCOSAMINE'>SGN</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</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">Electron Microscopy, [[Resolution|Resolution]] 3.03&#8491;</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=CU:COPPER+(II)+ION'>CU</scene>, <scene name='pdbligand=IDS:2-O-SULFO-ALPHA-L-IDOPYRANURONIC+ACID'>IDS</scene>, <scene name='pdbligand=SGN:N,O6-DISULFO-GLUCOSAMINE'>SGN</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=7ysw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7ysw OCA], [https://pdbe.org/7ysw PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7ysw RCSB], [https://www.ebi.ac.uk/pdbsum/7ysw PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7ysw ProSAT]</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=7ysw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7ysw OCA], [https://pdbe.org/7ysw PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7ysw RCSB], [https://www.ebi.ac.uk/pdbsum/7ysw PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7ysw ProSAT]</span></td></tr>
</table>
</table>
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== Function ==
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<div style="background-color:#fffaf0;">
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[https://www.uniprot.org/uniprot/FGFR4_HUMAN FGFR4_HUMAN] Tyrosine-protein kinase that acts as cell-surface receptor for fibroblast growth factors and plays a role in the regulation of cell proliferation, differentiation and migration, and in regulation of lipid metabolism, bile acid biosynthesis, glucose uptake, vitamin D metabolism and phosphate homeostasis. Required for normal down-regulation of the expression of CYP7A1, the rate-limiting enzyme in bile acid synthesis, in response to FGF19. Phosphorylates PLCG1 and FRS2. Ligand binding leads to the activation of several signaling cascades. Activation of PLCG1 leads to the production of the cellular signaling molecules diacylglycerol and inositol 1,4,5-trisphosphate. Phosphorylation of FRS2 triggers recruitment of GRB2, GAB1, PIK3R1 and SOS1, and mediates activation of RAS, MAPK1/ERK2, MAPK3/ERK1 and the MAP kinase signaling pathway, as well as of the AKT1 signaling pathway. Promotes SRC-dependent phosphorylation of the matrix protease MMP14 and its lysosomal degradation. FGFR4 signaling is down-regulated by receptor internalization and degradation; MMP14 promotes internalization and degradation of FGFR4. Mutations that lead to constitutive kinase activation or impair normal FGFR4 inactivation lead to aberrant signaling.<ref>PMID:7680645</ref> <ref>PMID:7518429</ref> <ref>PMID:8663044</ref> <ref>PMID:11433297</ref> <ref>PMID:16597617</ref> <ref>PMID:17623664</ref> <ref>PMID:17311277</ref> <ref>PMID:18480409</ref> <ref>PMID:18670643</ref> <ref>PMID:20683963</ref> <ref>PMID:20018895</ref> <ref>PMID:20798051</ref> <ref>PMID:21653700</ref> <ref>PMID:20876804</ref>
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== Publication Abstract from PubMed ==
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alpha/betaKlotho coreceptors simultaneously engage fibroblast growth factor (FGF) hormones (FGF19, FGF21 and FGF23)(1,2) and their cognate cell-surface FGF receptors (FGFR1-4) thereby stabilizing the endocrine FGF-FGFR complex(3-6). However, these hormones still require heparan sulfate (HS) proteoglycan as an additional coreceptor to induce FGFR dimerization/activation and hence elicit their essential metabolic activities(6). To reveal the molecular mechanism underpinning the coreceptor role of HS, we solved cryo-electron microscopy structures of three distinct 1:2:1:1 FGF23-FGFR-alphaKlotho-HS quaternary complexes featuring the 'c' splice isoforms of FGFR1 (FGFR1c), FGFR3 (FGFR3c) or FGFR4 as the receptor component. These structures, supported by cell-based receptor complementation and heterodimerization experiments, reveal that a single HS chain enables FGF23 and its primary FGFR within a 1:1:1 FGF23-FGFR-alphaKlotho ternary complex to jointly recruit a lone secondary FGFR molecule leading to asymmetric receptor dimerization and activation. However, alphaKlotho does not directly participate in recruiting the secondary receptor/dimerization. We also show that the asymmetric mode of receptor dimerization is applicable to paracrine FGFs that signal solely in an HS-dependent fashion. Our structural and biochemical data overturn the current symmetric FGFR dimerization paradigm and provide blueprints for rational discovery of modulators of FGF signalling(2) as therapeutics for human metabolic diseases and cancer.
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Structural basis for FGF hormone signalling.,Chen L, Fu L, Sun J, Huang Z, Fang M, Zinkle A, Liu X, Lu J, Pan Z, Wang Y, Liang G, Li X, Chen G, Mohammadi M Nature. 2023 Jun;618(7966):862-870. doi: 10.1038/s41586-023-06155-9. Epub 2023 , Jun 7. PMID:37286607<ref>PMID:37286607</ref>
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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 7ysw" style="background-color:#fffaf0;"></div>
== References ==
== References ==
<references/>
<references/>

Current revision

Cryo-EM Structure of FGF23-FGFR4-aKlotho-HS Quaternary Complex

PDB ID 7ysw

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