Structure of PDB 1xk3 Chain B Binding Site BS01

Receptor Information
>1xk3 Chain B (length=214) Species: 9606 (Homo sapiens) [Search protein sequence] [Download receptor structure] [Download structure with residue number starting from 1] [View receptor structure]
PQDLSEALKEATKEVHTQAENAEFMRNFQKGQVTRDGFKLVMASLYHIYV
ALEEEIERNKESPVFAPVYFPEELHRKAALEQDLAFWYGPRWQEVIPYTP
AMQRYVKRLHEVGRTEPELLVAHAYTRYLGDLSGGQVLKKIAQKALDLPS
SGEGLAFFTFPNIASATKFKQLYESRMNSLEMTPAVRQRVIEEAKTAFLL
NIQLFEELQELLTH
Ligand information
Ligand IDHEM
InChIInChI=1S/C34H34N4O4.Fe/c1-7-21-17(3)25-13-26-19(5)23(9-11-33(39)40)31(37-26)16-32-24(10-12-34(41)42)20(6)28(38-32)15-30-22(8-2)18(4)27(36-30)14-29(21)35-25;/h7-8,13-16H,1-2,9-12H2,3-6H3,(H4,35,36,37,38,39,40,41,42);/q;+2/p-2/b25-13-,26-13-,27-14-,28-15-,29-14-,30-15-,31-16-,32-16-;
InChIKeyKABFMIBPWCXCRK-RGGAHWMASA-L
SMILES
SoftwareSMILES
OpenEye OEToolkits 1.7.6Cc1c2n3c(c1CCC(=O)O)C=C4C(=C(C5=[N]4[Fe]36[N]7=C(C=C8N6C(=C5)C(=C8C)C=C)C(=C(C7=C2)C)C=C)C)CCC(=O)O
CACTVS 3.385CC1=C(CCC(O)=O)C2=Cc3n4[Fe]5|6|N2=C1C=c7n5c(=CC8=N|6C(=Cc4c(C)c3CCC(O)=O)C(=C8C=C)C)c(C)c7C=C
ACDLabs 12.01C=1c3c(c(c4C=C5C(=C(C=6C=C7C(=C(C8=CC=2C(=C(C=1N=2[Fe](n34)(N5=6)N78)CCC(=O)O)C)\C=C)C)\C=C)C)C)CCC(=O)O
FormulaC34 H32 Fe N4 O4
NamePROTOPORPHYRIN IX CONTAINING FE;
HEME
ChEMBL
DrugBankDB18267
ZINC
PDB chain1xk3 Chain B Residue 300 [Download ligand structure] [Download structure with residue number starting from 1] [View ligand structure]
Receptor-Ligand Complex Structure
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PDB1xk3 Regiospecificity determinants of human heme oxygenase: differential NADPH- and ascorbate-dependent heme cleavage by the R183E mutant.
Resolution2.08 Å
Binding residue
(original residue number in PDB)		K18 H25 E29 M34 Q38 Y134 T135 G139 F207 N210 F214
Binding residue
(residue number reindexed from 1)		K9 H16 E20 M25 Q29 Y125 T126 G130 F198 N201 F205
Annotation score4
Enzymatic activity
Catalytic site (original residue number in PDB) N30 Y58 T135 R136 G139 D140 G144
Catalytic site (residue number reindexed from 1) N21 Y49 T126 R127 G130 D131 G135
Enzyme Commision number 1.14.14.18: heme oxygenase (biliverdin-producing).
Gene Ontology
Molecular Function
GO:0004392 heme oxygenase (decyclizing) activity
Biological Process
GO:0006788 heme oxidation

View graph for
Molecular Function
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Biological Process
External links
PDB RCSB:1xk3, PDBe:1xk3, PDBj:1xk3
PDBsum1xk3
PubMed15525643
UniProtP09601|HMOX1_HUMAN Heme oxygenase 1 (Gene Name=HMOX1)

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