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==CRYSTAL STRUCTURE OF HUMAN INDOLEAMINE 2,3-DIOXYGENASE 1 (IDO1) in complex with ferrous heme and tryptophan==
==CRYSTAL STRUCTURE OF HUMAN INDOLEAMINE 2,3-DIOXYGENASE 1 (IDO1) in complex with ferrous heme and tryptophan==
<StructureSection load='6e46' size='340' side='right' caption='[[6e46]], [[Resolution|resolution]] 2.09&Aring;' scene=''>
<StructureSection load='6e46' size='340' side='right'caption='[[6e46]], [[Resolution|resolution]] 2.09&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[6e46]] is a 4 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6E46 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6E46 FirstGlance]. <br>
<table><tr><td colspan='2'>[[6e46]] 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=6E46 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6E46 FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene>, <scene name='pdbligand=TRP:TRYPTOPHAN'>TRP</scene></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]] 2.09&#8491;</td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Indoleamine_2,3-dioxygenase Indoleamine 2,3-dioxygenase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.13.11.52 1.13.11.52] </span></td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene>, <scene name='pdbligand=TRP:TRYPTOPHAN'>TRP</scene></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=6e46 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6e46 OCA], [http://pdbe.org/6e46 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6e46 RCSB], [http://www.ebi.ac.uk/pdbsum/6e46 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6e46 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=6e46 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6e46 OCA], [https://pdbe.org/6e46 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6e46 RCSB], [https://www.ebi.ac.uk/pdbsum/6e46 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6e46 ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
[[http://www.uniprot.org/uniprot/I23O1_HUMAN I23O1_HUMAN]] Catalyzes the cleavage of the pyrrol ring of tryptophan and incorporates both atoms of a molecule of oxygen.<ref>PMID:17671174</ref>
[https://www.uniprot.org/uniprot/I23O1_HUMAN I23O1_HUMAN] Catalyzes the cleavage of the pyrrol ring of tryptophan and incorporates both atoms of a molecule of oxygen.<ref>PMID:17671174</ref>  
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Human indoleamine 2,3-dioxygenase 1 (IDO1) is a heme-dependent enzyme with important roles in many cellular processes and is a potential target for drug discovery against cancer and other diseases. Crystal structures of IDO1 in complex with various inhibitors have been reported. Many of these crystals belong to the same crystal form and most of the reported structures have resolutions in the range 3.2-2.3 A. Here, three new crystal forms of human IDO1 obtained by introducing a surface mutation, K116A/K117A, distant from the active site are reported. One of these crystal forms diffracted to 1.5 A resolution and can be readily used for soaking experiments to determine high-resolution structures of IDO1 in complex with the substrate tryptophan or inhibitors that coordinate the heme. In addition, this mutant was used to produce crystals of a complex with an inhibitor that targets the apo form of the enzyme under the same conditions; the structure of this complex was determined at 1.7 A resolution. Overall, this mutant represents a robust platform for determining the structures of inhibitor and substrate complexes of IDO1 at high resolution.


High-resolution structures of inhibitor complexes of human indoleamine 2,3-dioxygenase 1 in a new crystal form.,Luo S, Xu K, Xiang S, Chen J, Chen C, Guo C, Tong Y, Tong L Acta Crystallogr F Struct Biol Commun. 2018 Nov 1;74(Pt 11):717-724. doi:, 10.1107/S2053230X18012955. Epub 2018 Oct 17. PMID:30387777<ref>PMID:30387777</ref>
==See Also==
 
*[[Dioxygenase 3D structures|Dioxygenase 3D structures]]
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6e46" style="background-color:#fffaf0;"></div>
== References ==
== References ==
<references/>
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Indoleamine 2,3-dioxygenase]]
[[Category: Homo sapiens]]
[[Category: Luo, S]]
[[Category: Large Structures]]
[[Category: Tong, L]]
[[Category: Luo S]]
[[Category: Ferrous state]]
[[Category: Tong L]]
[[Category: Ido1]]
[[Category: Oxidoreductase-oxidoreductase inhibitor complex]]
[[Category: Substrate complex]]

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