5tk5: Difference between revisions
New page: '''Unreleased structure''' The entry 5tk5 is ON HOLD Authors: Pidugu, L.S., Toth, E.A. Description: Crystal structure of human 3HAO with iron bound in the active site. [[Category: Unre... |
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The | ==Crystal structure of human 3HAO with iron bound in the active site== | ||
<StructureSection load='5tk5' size='340' side='right'caption='[[5tk5]], [[Resolution|resolution]] 1.88Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[5tk5]] is a 1 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=5TK5 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5TK5 FirstGlance]. <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]] 1.88Å</td></tr> | |||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=FE:FE+(III)+ION'>FE</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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=5tk5 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5tk5 OCA], [https://pdbe.org/5tk5 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5tk5 RCSB], [https://www.ebi.ac.uk/pdbsum/5tk5 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5tk5 ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/3HAO_HUMAN 3HAO_HUMAN] Catalyzes the oxidative ring opening of 3-hydroxyanthranilate to 2-amino-3-carboxymuconate semialdehyde, which spontaneously cyclizes to quinolinate.<ref>PMID:7514594</ref> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
3-Hydroxyanthranilate 3,4-dioxygenase (3HAO) is an enzyme in the microglial branch of the kynurenine pathway of tryptophan degradation. 3HAO is a non-heme iron-containing, ring-cleaving extradiol dioxygenase that catalyzes the addition of both atoms of O2 to the kynurenine pathway metabolite 3-hydroxyanthranilic acid (3-HANA) to form quinolinic acid (QUIN). QUIN is a highly potent excitotoxin that has been implicated in a number of neurodegenerative conditions, making 3HAO a target for pharmacological downregulation. Here, the first crystal structure of human 3HAO with the native iron bound in its active site is presented, together with an additional structure with zinc (a known inhibitor of human 3HAO) bound in the active site. The metal-binding environment is examined both structurally and via inductively coupled plasma mass spectrometry (ICP-MS), X-ray fluorescence spectroscopy (XRF) and electron paramagnetic resonance spectroscopy (EPR). The studies identified Met35 as the source of potential new interactions with substrates and inhibitors, which may prove useful in future therapeutic efforts. | |||
Crystal structures of human 3-hydroxyanthranilate 3,4-dioxygenase with native and non-native metals bound in the active site.,Pidugu LS, Neu H, Wong TL, Pozharski E, Molloy JL, Michel SL, Toth EA Acta Crystallogr D Struct Biol. 2017 Apr 1;73(Pt 4):340-348. doi:, 10.1107/S2059798317002029. Epub 2017 Mar 31. PMID:28375145<ref>PMID:28375145</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
[[Category: | </div> | ||
[[Category: | <div class="pdbe-citations 5tk5" style="background-color:#fffaf0;"></div> | ||
[[Category: | |||
==See Also== | |||
*[[Dioxygenase 3D structures|Dioxygenase 3D structures]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Homo sapiens]] | |||
[[Category: Large Structures]] | |||
[[Category: Pidugu LS]] | |||
[[Category: Toth EA]] | |||
Latest revision as of 16:04, 4 October 2023
Crystal structure of human 3HAO with iron bound in the active siteCrystal structure of human 3HAO with iron bound in the active site
Structural highlights
Function3HAO_HUMAN Catalyzes the oxidative ring opening of 3-hydroxyanthranilate to 2-amino-3-carboxymuconate semialdehyde, which spontaneously cyclizes to quinolinate.[1] Publication Abstract from PubMed3-Hydroxyanthranilate 3,4-dioxygenase (3HAO) is an enzyme in the microglial branch of the kynurenine pathway of tryptophan degradation. 3HAO is a non-heme iron-containing, ring-cleaving extradiol dioxygenase that catalyzes the addition of both atoms of O2 to the kynurenine pathway metabolite 3-hydroxyanthranilic acid (3-HANA) to form quinolinic acid (QUIN). QUIN is a highly potent excitotoxin that has been implicated in a number of neurodegenerative conditions, making 3HAO a target for pharmacological downregulation. Here, the first crystal structure of human 3HAO with the native iron bound in its active site is presented, together with an additional structure with zinc (a known inhibitor of human 3HAO) bound in the active site. The metal-binding environment is examined both structurally and via inductively coupled plasma mass spectrometry (ICP-MS), X-ray fluorescence spectroscopy (XRF) and electron paramagnetic resonance spectroscopy (EPR). The studies identified Met35 as the source of potential new interactions with substrates and inhibitors, which may prove useful in future therapeutic efforts. Crystal structures of human 3-hydroxyanthranilate 3,4-dioxygenase with native and non-native metals bound in the active site.,Pidugu LS, Neu H, Wong TL, Pozharski E, Molloy JL, Michel SL, Toth EA Acta Crystallogr D Struct Biol. 2017 Apr 1;73(Pt 4):340-348. doi:, 10.1107/S2059798317002029. Epub 2017 Mar 31. PMID:28375145[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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