SAXSdb — 2ibj

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

Cytochrome b5

Musca domestica

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein monomer	Monomer	Protein 1	MAGNESIUM ION × 2 PROTOPORPHYRIN IX CONTAINING FE × 1 water × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	CYB5_MUSDO
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–88； UniProt 1–88

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	2ibj
Deposition date deposition_date	2006-09-11
Structure title title	Structure of House Fly Cytochrome B5
Keywords keywords	Fly CYTOCHROME B5, HEME, ELECTRON TRANSPORT; ELECTRON TRANSPORT
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.

2ibj__assembly_1__model_1

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

Download this curve (.dat)

2ibj__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

2ibj__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	13.88 Å
Rg (electron density)	12.47 Å
Total Rg	13.82 Å
Atom count	739
Residues	86
Excluded volume	12896 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`2ibj__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	Cytochrome b5
Molecular weight formula_weight	10091.0 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	985

MSSEDVKYFTRAEVAKNNTKDKNWFIIHNNVYDVTAFLNEHPGGEEVLIEQAGKDATEHFEDVGHSSDAREMMKQYKVGELVAEERSN

Source Source

Source organism organism	Musca domestica
Common name common_name	house fly
NCBI taxonomy ID ncbi_taxonomy_id	7370
Host organism host_organism	Escherichia coli BL21

Entity 2 Entity 2 non-polymer

Description description	MAGNESIUM ION
Molecular weight formula_weight	24.3 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 3 Entity 3 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 4 Entity 4 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	170

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6. Fold Classification (SCOP + CATH) 2 domains

SCOP 2.08 (1 domains)

Domain ID domain_id	d2ibja_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.120 — Cytochrome b5-like heme/steroid binding domain
Superfamily Superfamily superfamily	d.120.1 — Cytochrome b5-like heme/steroid binding domain
Family Family family	d.120.1.1 — Cytochrome b5

CATH v4.4 (1 domains)

Domain ID domain_id	2ibjA00
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	120 — Flavocytochrome B2; Chain A, domain 1
Homologous superfamily homologous superfamily	10 — Cytochrome b5-like heme/steroid binding domain

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Unit-cell length a length_a	33.201 Å
Unit-cell length b length_b	40.222 Å
Unit-cell length c length_c	70.245 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	4

Space group space_group	P 21 21 21
Space-group number int_tables_number	19
Crystal system crystal_system	—

Resolution resolution	1.550 Å
Low-resolution limit resolution_low	50.000 Å
R factor r_factor	—
R_work r_work	0.1630
R_free r_free	0.1940

Structure of House Fly Cytochrome B5

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

Cytochrome b5

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

2ibj__assembly_1__model_1

2ibj__assembly_1__model_1 | I(q)

2ibj__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)

Structure of House Fly Cytochrome B5

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

Cytochrome b5

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

2ibj__assembly_1__model_1

2ibj__assembly_1__model_1 | I(q)

2ibj__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)