SAXSdb — 6e41

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1. Protein Identity and Related Structures Protein Identity & Related Structures

Indoleamine 2,3-dioxygenase 1

Homo sapiens

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein monomer	Monomer	Protein 1	PROTOPORPHYRIN IX CONTAINING FE × 1 N-(3-bromo-4-fluorophenyl)-N'-hydroxy-4-{[2-(sulfamoylamino)ethyl]sulfanyl}-1,2,5-oxadiazole-3-carboximidamide × 2 water × 1	Consistent with protein count
2	Protein monomer	Monomer	Protein 1	PROTOPORPHYRIN IX CONTAINING FE × 1 N-(3-bromo-4-fluorophenyl)-N'-hydroxy-4-{[2-(sulfamoylamino)ethyl]sulfanyl}-1,2,5-oxadiazole-3-carboximidamide × 1 water × 1	Consistent with protein count
3	Protein monomer	Monomer	Protein 1	PROTOPORPHYRIN IX CONTAINING FE × 1 N-(3-bromo-4-fluorophenyl)-N'-hydroxy-4-{[2-(sulfamoylamino)ethyl]sulfanyl}-1,2,5-oxadiazole-3-carboximidamide × 2 water × 1	Consistent with protein count
4	Protein monomer	Monomer	Protein 1	PROTOPORPHYRIN IX CONTAINING FE × 1 N-(3-bromo-4-fluorophenyl)-N'-hydroxy-4-{[2-(sulfamoylamino)ethyl]sulfanyl}-1,2,5-oxadiazole-3-carboximidamide × 1 water × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	I23O1_HUMAN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 17–405； UniProt 15–403 Author chain B； PDBConstruct 17–405； UniProt 15–403 Author chain C； PDBConstruct 17–405； UniProt 15–403 Author chain D； PDBConstruct 17–405； UniProt 15–403

The page prioritizes protein identity, the current assembly, associated components, oligomeric state and cross-PDB links. Chain mapping and sequence ranges are retained as data evidence. Internal IDs, import timestamps and assembly operation expressions are maintenance fields and are not shown here.

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2. Structure Basics 2. Structure Basics

Entry ID entry_id	6e41
Deposition date deposition_date	2018-07-16
Structure title title	CRYSTAL STRUCTURE OF HUMAN INDOLEAMINE 2,3-DIOXYGENASE 1 (IDO1) in complex with ferric heme and an Epacadostat analog
Keywords keywords	IDO1, Epacadostat analog, inhibitor complex, oxidoreductase-oxidoreductase inhibitor complex; oxidoreductase/oxidoreductase inhibitor
Experimental Method method	X-RAY DIFFRACTION

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3. Official assembly/model SAXS Official SAXS Profiles

This page reads only the latest assembly calculations. Every curve maps to an explicit PDB entry, official biological assembly and coordinate model.

6e41__assembly_2__model_1

Assembly 2 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

6e41__assembly_2__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

6e41__assembly_2__model_1 | P(r) · Pending

P(r) will be calculated and displayed separately for the same assembly/model.

Rg（Guinier）	22.37 Å
Rg (electron density)	21.29 Å
Total Rg	22.21 Å
Atom count	3034
Residues	376
Excluded volume	54436 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`6e41__assembly_1__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`6e41__assembly_2__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
3	1	`6e41__assembly_3__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
4	1	`6e41__assembly_4__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download

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4. Crystallography and Experiment 4. Crystallography & Experiment

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5. Entities and Polymers Entities & Polymers (4)

Entity 1 Entity 1 polymer

Description description	Indoleamine 2,3-dioxygenase 1
Molecular weight formula_weight	45300.9 kDa
EC 编号 ec_number	1.13.11.52
Mutation mutation	K116A, K117A
Source method src_method	man
Copy count entity_count	4

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D
Atom count atom_count	12520

MGSSHHHHHHSSGSAAYHIDEEVGFALPNPQENLPDFYNDWMFIAKHLPDLIESGQLRERVEKLNMLSIDHLTDHKSQRLARLVLGCITMAYVWGKGHGDVRKVLPRNIAVPYCQLSAALELPPILVYADCVLANWKKKDPNKPLTYENMDVLFSFRDGDCSKGFFLVSLLVEIAAASAIKVIPTVFKAMQMQERDTLLKALLEIASCLEKALQVFHQIHDHVNPKAFFSVLRIYLSGWKGNPQLSDGLVYEGFWEDPKEFAGGSAGQSSVFQCFDVLLGIQQTAGGGHAAQFLQDMRRYMPPAHRNFLCSLESNPSVREFVLSKGDAGLREAYDACVKALVSLRSYHLQIVTKYILIPASQQPKENKTSEDPSKLEAKGTGGTDLMNFLKTVRSTTEKSLLKEG

Source Source

Source organism organism	Homo sapiens
Common name common_name	Human
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 non-polymer

Description description	PROTOPORPHYRIN IX CONTAINING FE
Molecular weight formula_weight	616.5 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 3 Entity 3 non-polymer

Description description	N-(3-bromo-4-fluorophenyl)-N'-hydroxy-4-{[2-(sulfamoylamino)ethyl]sulfanyl}-1,2,5-oxadiazole-3-carboximidamide
Molecular weight formula_weight	455.3 kDa
Source method src_method	syn
Copy count entity_count	6

Entity 4 Entity 4 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	286

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6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (8 domains)

Domain ID domain_id	d6e41a1
Class class	a — All alpha proteins
Fold Fold fold	a.266 — Indolic compounds 2,3-dioxygenase-like
Superfamily Superfamily superfamily	a.266.1 — Indolic compounds 2,3-dioxygenase-like
Family Family family	a.266.1.2 — Indoleamine 2,3-dioxygenase-like

Domain ID domain_id	d6e41a2
Class class	l — Artifacts
Fold Fold fold	l.1 — Tags
Superfamily Superfamily superfamily	l.1.1 — Tags
Family Family family	l.1.1.1 — Tags

Domain ID domain_id	d6e41b1
Class class	a — All alpha proteins
Fold Fold fold	a.266 — Indolic compounds 2,3-dioxygenase-like
Superfamily Superfamily superfamily	a.266.1 — Indolic compounds 2,3-dioxygenase-like
Family Family family	a.266.1.2 — Indoleamine 2,3-dioxygenase-like

Domain ID domain_id	d6e41b2
Class class	l — Artifacts
Fold Fold fold	l.1 — Tags
Superfamily Superfamily superfamily	l.1.1 — Tags
Family Family family	l.1.1.1 — Tags

Domain ID domain_id	d6e41c1
Class class	a — All alpha proteins
Fold Fold fold	a.266 — Indolic compounds 2,3-dioxygenase-like
Superfamily Superfamily superfamily	a.266.1 — Indolic compounds 2,3-dioxygenase-like
Family Family family	a.266.1.2 — Indoleamine 2,3-dioxygenase-like

Domain ID domain_id	d6e41c2
Class class	l — Artifacts
Fold Fold fold	l.1 — Tags
Superfamily Superfamily superfamily	l.1.1 — Tags
Family Family family	l.1.1.1 — Tags

Domain ID domain_id	d6e41d1
Class class	a — All alpha proteins
Fold Fold fold	a.266 — Indolic compounds 2,3-dioxygenase-like
Superfamily Superfamily superfamily	a.266.1 — Indolic compounds 2,3-dioxygenase-like
Family Family family	a.266.1.2 — Indoleamine 2,3-dioxygenase-like

Domain ID domain_id	d6e41d2
Class class	l — Artifacts
Fold Fold fold	l.1 — Tags
Superfamily Superfamily superfamily	l.1.1 — Tags
Family Family family	l.1.1.1 — Tags

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Unit-cell length a length_a	80.916 Å
Unit-cell length b length_b	201.722 Å
Unit-cell length c length_c	114.893 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	16

Space group space_group	P 21 21 2
Space-group number int_tables_number	18
Crystal system crystal_system	—

Resolution resolution	2.291 Å
Low-resolution limit resolution_low	55.250 Å
R factor r_factor	0.2055
R_work r_work	0.2031
R_free r_free	0.2506

CRYSTAL STRUCTURE OF HUMAN INDOLEAMINE 2,3-DIOXYGENASE 1 (IDO1) in complex with ferric heme and an Epacadostat analog

1. Protein Identity and Related Structures Protein Identity & Related Structures

Indoleamine 2,3-dioxygenase 1

State in the Current Structure

Other States of the Same Protein in the Database

2. Structure Basics 2. Structure Basics

3. Official assembly/model SAXS Official SAXS Profiles

6e41__assembly_2__model_1

6e41__assembly_2__model_1 | I(q)

6e41__assembly_2__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

Diffraction experiment Diffraction

5. Entities and Polymers Entities & Polymers (4)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (8 domains)

7. Citations (1)

CRYSTAL STRUCTURE OF HUMAN INDOLEAMINE 2,3-DIOXYGENASE 1 (IDO1) in complex with ferric heme and an Epacadostat analog

1. Protein Identity and Related Structures Protein Identity & Related Structures

Indoleamine 2,3-dioxygenase 1

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

2. Structure Basics 2. Structure Basics

3. Official assembly/model SAXS Official SAXS Profiles

6e41__assembly_2__model_1

6e41__assembly_2__model_1 | I(q)

6e41__assembly_2__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

Diffraction experiment Diffraction

5. Entities and Polymers Entities & Polymers (4)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (8 domains)

7. Citations (1)