SAXSdb — 1ikj

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

NITROPHORIN 4

Rhodnius prolixus

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 IMIDAZOLE × 1 water × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	NP4_RHOPR
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–184； UniProt 22–205

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	1ikj
Deposition date deposition_date	2001-05-03
Structure title title	1.27 A CRYSTAL STRUCTURE OF NITROPHORIN 4 FROM RHODNIUS PROLIXUS COMPLEXED WITH IMIDAZOLE
Keywords keywords	NITRIC OXIDE TRANSPORT, FERRIC HEME, ANTIHISTAMINE, VASODILATOR, LIPOCALIN, BILAN BINDING PROTEIN, TRANSPORT PROTEIN; TRANSPORT PROTEIN
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.

1ikj__assembly_1__model_1

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

Download this curve (.dat)

1ikj__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1ikj__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	16.55 Å
Rg (electron density)	15.09 Å
Total Rg	16.42 Å
Atom count	1476
Residues	184
Excluded volume	26203 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1ikj__assembly_1__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	NITROPHORIN 4
Molecular weight formula_weight	20292.7 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A
Atom count atom_count	1829

ACTKNAIAQTGFNKDKYFNGDVWYVTDYLDLEPDDVPKRYCAALAAGTASGKLKEALYHYDPKTQDTFYDVSELQVESLGKYTANFKKVDKNGNVKVAVTAGNYYTFTVMYADDSSALIHTCLHKGNKDLGDLYAVLNRNKDAAAGDKVKSAVSAATLEFSKFISTKENNCAYDNDSLKSLLTK

Source Source

Source organism organism	Rhodnius prolixus
NCBI taxonomy ID ncbi_taxonomy_id	13249
Host organism host_organism	Escherichia coli BL21(DE3)

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	1

Entity 3 Entity 3 non-polymer

Description description	IMIDAZOLE
Molecular weight formula_weight	69.1 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 4 Entity 4 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	276

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6. Fold Classification (SCOP + CATH) 2 domains

SCOP 2.08 (1 domains)

Domain ID domain_id	d1ikja_
Class class	b — All beta proteins
Fold Fold fold	b.60 — Lipocalins
Superfamily Superfamily superfamily	b.60.1 — Lipocalins
Family Family family	b.60.1.1 — Retinol binding protein-like

CATH v4.4 (1 domains)

Domain ID domain_id	1ikjA00
Class class	2 — Mainly Beta
Architecture architecture	40 — Beta Barrel
Topology topology	128 — Lipocalin
Homologous superfamily homologous superfamily	20 — Calycin beta-barrel core domain

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Unit-cell length a length_a	70.180 Å
Unit-cell length b length_b	42.480 Å
Unit-cell length c length_c	52.960 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	94.28 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	4

Space group space_group	C 1 2 1
Space-group number int_tables_number	5
Crystal system crystal_system	—

Resolution resolution	1.270 Å
Low-resolution limit resolution_low	22.000 Å
R factor r_factor	0.1270
R_work r_work	0.1270
R_free r_free	0.1730

1.27 A CRYSTAL STRUCTURE OF NITROPHORIN 4 FROM RHODNIUS PROLIXUS COMPLEXED WITH IMIDAZOLE

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

NITROPHORIN 4

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

1ikj__assembly_1__model_1

1ikj__assembly_1__model_1 | I(q)

1ikj__assembly_1__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) 2 domains

SCOP 2.08 (1 domains)

CATH v4.4 (1 domains)

7. Citations (1)

1.27 A CRYSTAL STRUCTURE OF NITROPHORIN 4 FROM RHODNIUS PROLIXUS COMPLEXED WITH IMIDAZOLE

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

NITROPHORIN 4

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

1ikj__assembly_1__model_1

1ikj__assembly_1__model_1 | I(q)

1ikj__assembly_1__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) 2 domains

SCOP 2.08 (1 domains)

CATH v4.4 (1 domains)

7. Citations (1)