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| | <StructureSection load='4i3b' size='340' side='right'caption='[[4i3b]], [[Resolution|resolution]] 1.20Å' scene=''> | | <StructureSection load='4i3b' size='340' side='right'caption='[[4i3b]], [[Resolution|resolution]] 1.20Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[4i3b]] is a 6 chain structure with sequence from [http://en.wikipedia.org/wiki/Angja Angja]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4I3B OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4I3B FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[4i3b]] is a 6 chain structure with sequence from [https://en.wikipedia.org/wiki/Anguilla_japonica Anguilla japonica]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4I3B OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4I3B FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=BLR:3-[5-[(Z)-(4-ethenyl-3-methyl-5-oxidanylidene-pyrrol-2-ylidene)methyl]-2-[[5-[(Z)-(3-ethenyl-4-methyl-5-oxidanylidene-pyrrol-2-ylidene)methyl]-3-(3-hydroxy-3-oxopropyl)-4-methyl-1H-pyrrol-2-yl]methyl]-4-methyl-1H-pyrrol-3-yl]propanoic+acid'>BLR</scene>, <scene name='pdbligand=PEG:DI(HYDROXYETHYL)ETHER'>PEG</scene></td></tr> | + | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BLR:3-[5-[(Z)-(4-ethenyl-3-methyl-5-oxidanylidene-pyrrol-2-ylidene)methyl]-2-[[5-[(Z)-(3-ethenyl-4-methyl-5-oxidanylidene-pyrrol-2-ylidene)methyl]-3-(3-hydroxy-3-oxopropyl)-4-methyl-1H-pyrrol-2-yl]methyl]-4-methyl-1H-pyrrol-3-yl]propanoic+acid'>BLR</scene>, <scene name='pdbligand=PEG:DI(HYDROXYETHYL)ETHER'>PEG</scene></td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4i3c|4i3c]], [[4i3d|4i3d]]</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=4i3b FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4i3b OCA], [https://pdbe.org/4i3b PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4i3b RCSB], [https://www.ebi.ac.uk/pdbsum/4i3b PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4i3b 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=4i3b FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4i3b OCA], [http://pdbe.org/4i3b PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4i3b RCSB], [http://www.ebi.ac.uk/pdbsum/4i3b PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4i3b ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/UNAG_ANGJA UNAG_ANGJA]] Beta-barrel protein that binds unconjugated bilirubin with high affinity. Excitation of the bilirubin-bound protein gives rise to green fluorescence, both under normoxia and hypoxia. The apoprotein is not fluorescent. Does not emit fluorescence in the presence of ditauro-bilirubin, urobilin or biliverdin.<ref>PMID:23768684</ref> | + | [https://www.uniprot.org/uniprot/UNAG_ANGJA UNAG_ANGJA] Beta-barrel protein that binds unconjugated bilirubin with high affinity. Excitation of the bilirubin-bound protein gives rise to green fluorescence, both under normoxia and hypoxia. The apoprotein is not fluorescent. Does not emit fluorescence in the presence of ditauro-bilirubin, urobilin or biliverdin.<ref>PMID:23768684</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: Angja]] | + | [[Category: Anguilla japonica]] |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Ando, R]] | + | [[Category: Ando R]] |
| - | [[Category: Kumagai, A]] | + | [[Category: Kumagai A]] |
| - | [[Category: Miyatake, H]] | + | [[Category: Miyatake H]] |
| - | [[Category: Miyawaki, A]] | + | [[Category: Miyawaki A]] |
| - | [[Category: Beta barrel]]
| + | |
| - | [[Category: Bilirubin binding protein]]
| + | |
| - | [[Category: Cytosol]]
| + | |
| - | [[Category: Fatty acid binding protein-like]]
| + | |
| - | [[Category: Fluorescent protein]]
| + | |
| - | [[Category: Lipocalin]]
| + | |
| Structural highlights
Function
UNAG_ANGJA Beta-barrel protein that binds unconjugated bilirubin with high affinity. Excitation of the bilirubin-bound protein gives rise to green fluorescence, both under normoxia and hypoxia. The apoprotein is not fluorescent. Does not emit fluorescence in the presence of ditauro-bilirubin, urobilin or biliverdin.[1]
Publication Abstract from PubMed
The fluorescent protein toolbox has revolutionized experimental biology. Despite this advance, no fluorescent proteins have been identified from vertebrates, nor has chromogenic ligand-inducible activation or clinical utility been demonstrated. Here, we report the cloning and characterization of UnaG, a fluorescent protein from Japanese eel. UnaG belongs to the fatty-acid-binding protein (FABP) family, and expression in eel is restricted to small-diameter muscle fibers. On heterologous expression in cell lines or mouse brain, UnaG produces oxygen-independent green fluorescence. Remarkably, UnaG fluorescence is triggered by an endogenous ligand, bilirubin, a membrane-permeable heme metabolite and clinical health biomarker. The holoUnaG structure at 1.2 A revealed a biplanar coordination of bilirubin by reversible pi-conjugation, and we used this high-affinity and high-specificity interaction to establish a fluorescence-based human bilirubin assay with promising clinical utility. UnaG will be the prototype for a versatile class of ligand-activated fluorescent proteins, with applications in research, medicine, and bioengineering.
A bilirubin-inducible fluorescent protein from eel muscle.,Kumagai A, Ando R, Miyatake H, Greimel P, Kobayashi T, Hirabayashi Y, Shimogori T, Miyawaki A Cell. 2013 Jun 20;153(7):1602-11. doi: 10.1016/j.cell.2013.05.038. Epub 2013 Jun , 13. PMID:23768684[2]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Kumagai A, Ando R, Miyatake H, Greimel P, Kobayashi T, Hirabayashi Y, Shimogori T, Miyawaki A. A bilirubin-inducible fluorescent protein from eel muscle. Cell. 2013 Jun 20;153(7):1602-11. doi: 10.1016/j.cell.2013.05.038. Epub 2013 Jun , 13. PMID:23768684 doi:10.1016/j.cell.2013.05.038
- ↑ Kumagai A, Ando R, Miyatake H, Greimel P, Kobayashi T, Hirabayashi Y, Shimogori T, Miyawaki A. A bilirubin-inducible fluorescent protein from eel muscle. Cell. 2013 Jun 20;153(7):1602-11. doi: 10.1016/j.cell.2013.05.038. Epub 2013 Jun , 13. PMID:23768684 doi:10.1016/j.cell.2013.05.038
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