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| | ==Structure of FBXL5 hemerythrin domain, P2(1) cell== | | ==Structure of FBXL5 hemerythrin domain, P2(1) cell== |
| - | <StructureSection load='3v5y' size='340' side='right' caption='[[3v5y]], [[Resolution|resolution]] 2.10Å' scene=''> | + | <StructureSection load='3v5y' size='340' side='right'caption='[[3v5y]], [[Resolution|resolution]] 2.10Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[3v5y]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3V5Y OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3V5Y FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[3v5y]] 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=3V5Y OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3V5Y FirstGlance]. <br> |
| - | </td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=FEO:MU-OXO-DIIRON'>FEO</scene><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]] 2.1Å</td></tr> |
| - | <tr><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3v5x|3v5x]], [[3v5z|3v5z]]</td></tr>
| + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=FEO:MU-OXO-DIIRON'>FEO</scene></td></tr> |
| - | <tr><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">FBL4, FBL5, FBXL5, FLR1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 Homo sapiens])</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=3v5y FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3v5y OCA], [https://pdbe.org/3v5y PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3v5y RCSB], [https://www.ebi.ac.uk/pdbsum/3v5y PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3v5y ProSAT]</span></td></tr> |
| - | <tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3v5y FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3v5y OCA], [http://www.rcsb.org/pdb/explore.do?structureId=3v5y RCSB], [http://www.ebi.ac.uk/pdbsum/3v5y PDBsum]</span></td></tr> | + | </table> |
| - | <table> | + | == Function == |
| - | <div style="background-color:#fffaf0;">
| + | [https://www.uniprot.org/uniprot/FBXL5_HUMAN FBXL5_HUMAN] Component of some SCF (SKP1-cullin-F-box) protein ligase complex that plays a central role in iron homeostasis by promoting the ubiquitination and subsequent degradation of IREB2/IRP2. Upon high iron and oxygen level, it specifically recognizes and binds IREB2/IRP2, promoting its ubiquitination and degradation by the proteasome. Promotes ubiquitination and subsequent degradation of DCTN1/p150-glued.<ref>PMID:17532294</ref> <ref>PMID:19762596</ref> <ref>PMID:19762597</ref> |
| - | == Publication Abstract from PubMed == | + | |
| - | Mammalian cells maintain iron homeostasis by sensing changes in bioavailable iron levels and promoting adaptive responses. FBXL5 is a subunit of an E3 ubiquitin ligase complex that mediates the stability of Iron Regulatory Protein 2, an important posttranscriptional regulator of several genes involved in iron metabolism. FBXL5's own stability is regulated in an iron- and oxygen-responsive manner, contingent upon the presence of its N-terminal domain. Here we present the atomic structure of FBXL5's N-terminus, a hemerythrin-like alpha-helical bundle fold not previously observed in mammalian proteins. The core of this domain employs an unusual assortment of amino acids necessary for the assembly and sensing properties of its diiron center. These regulatory features govern the accessibility of a mapped sequence required for proteasomal degradation of FBXL5. Detailed molecular and structural characterization of the ligand responsive hemerythrin domain provides insights into the mechanisms by which FBXL5 serves as a unique mammalian metabolic sensor.
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| - | Structural and molecular characterization of the iron-sensing hemerythrin-like domain within F-box and leucine-rich repeat protein 5 (FBXL5).,Thompson JW, Salahudeen AA, Chollangi S, Ruiz JC, Brautigam CA, Makris TM, Lipscomb JD, Tomchick DR, Bruick RK J Biol Chem. 2012 Jan 17. PMID:22253436<ref>PMID:22253436</ref>
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| - | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br>
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| - | </div> | + | |
| | == References == | | == References == |
| | <references/> | | <references/> |
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| | </StructureSection> | | </StructureSection> |
| | [[Category: Homo sapiens]] | | [[Category: Homo sapiens]] |
| - | [[Category: Brautigam, C A.]] | + | [[Category: Large Structures]] |
| - | [[Category: Bruick, R K.]] | + | [[Category: Brautigam CA]] |
| - | [[Category: Thompson, J W.]] | + | [[Category: Bruick RK]] |
| - | [[Category: Tomchick, D R.]] | + | [[Category: Thompson JW]] |
| - | [[Category: Alpha helical bundle]] | + | [[Category: Tomchick DR]] |
| - | [[Category: E3 ubiquitin ligase complex]]
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| - | [[Category: Gene regulation]]
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| - | [[Category: Hemerythrin]]
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| Structural highlights
Function
FBXL5_HUMAN Component of some SCF (SKP1-cullin-F-box) protein ligase complex that plays a central role in iron homeostasis by promoting the ubiquitination and subsequent degradation of IREB2/IRP2. Upon high iron and oxygen level, it specifically recognizes and binds IREB2/IRP2, promoting its ubiquitination and degradation by the proteasome. Promotes ubiquitination and subsequent degradation of DCTN1/p150-glued.[1] [2] [3]
References
- ↑ Zhang N, Liu J, Ding X, Aikhionbare F, Jin C, Yao X. FBXL5 interacts with p150Glued and regulates its ubiquitination. Biochem Biophys Res Commun. 2007 Jul 20;359(1):34-9. Epub 2007 May 21. PMID:17532294 doi:http://dx.doi.org/10.1016/j.bbrc.2007.05.068
- ↑ Vashisht AA, Zumbrennen KB, Huang X, Powers DN, Durazo A, Sun D, Bhaskaran N, Persson A, Uhlen M, Sangfelt O, Spruck C, Leibold EA, Wohlschlegel JA. Control of iron homeostasis by an iron-regulated ubiquitin ligase. Science. 2009 Oct 30;326(5953):718-21. Epub 2009 Sep 17. PMID:19762596 doi:http://dx.doi.org/1176333
- ↑ Salahudeen AA, Thompson JW, Ruiz JC, Ma HW, Kinch LN, Li Q, Grishin NV, Bruick RK. An E3 ligase possessing an iron-responsive hemerythrin domain is a regulator of iron homeostasis. Science. 2009 Oct 30;326(5953):722-6. Epub 2009 Sep 17. PMID:19762597 doi:10.1126/science.1176326
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