SAXSdb — 3tk3

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

Cytochrome P450 2B4

Oryctolagus cuniculus

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 4-(4-CHLOROPHENYL)IMIDAZOLE × 1 water × 1	Consistent with protein count
2	Protein monomer	Monomer	Protein 1	PROTOPORPHYRIN IX CONTAINING FE × 1 4-(4-CHLOROPHENYL)IMIDAZOLE × 1 water × 1	Consistent with protein count
3	Protein monomer	Monomer	Protein 1	PROTOPORPHYRIN IX CONTAINING FE × 1 4-(4-CHLOROPHENYL)IMIDAZOLE × 1 water × 1	Consistent with protein count
4	Protein monomer	Monomer	Protein 1	PROTOPORPHYRIN IX CONTAINING FE × 1 4-(4-CHLOROPHENYL)IMIDAZOLE × 1 water × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	CP2B4_RABIT
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–472； UniProt 1–491 Author chain B； PDBConstruct 1–472； UniProt 1–491 Author chain C； PDBConstruct 1–472； UniProt 1–491 Author chain D； PDBConstruct 1–472； UniProt 1–491

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	3tk3
Deposition date deposition_date	2011-08-25
Structure title title	Cytochrome P450 2B4 mutant L437A in complex with 4-(4-chlorophenyl)imidazole
Keywords keywords	P450, cytochrome P450 2B4, monooxygenase, oxidoreductase, membrane protein, CYP 2B4, CYP LM2; OXIDOREDUCTASE
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.

3tk3__assembly_1__model_1

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

Download this curve (.dat)

3tk3__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3tk3__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	23.34 Å
Rg (electron density)	22.13 Å
Total Rg	23.03 Å
Atom count	3729
Residues	465
Excluded volume	66580 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3tk3__assembly_1__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`3tk3__assembly_2__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
3	1	`3tk3__assembly_3__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
4	1	`3tk3__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	Cytochrome P450 2B4
Molecular weight formula_weight	54127.0 kDa
EC 编号 ec_number	1.14.14.1
Mutation mutation	E2A, G22K, H23K, P24T, K25S, A26S, H27K, R29K, H226Y, L437A
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	15257

MAKKTSSKGKLPPGPSPLPVLGNLLQMDRKGLLRSFLRLREKYGDVFTVYLGSRPVVVLCGTDAIREALVDQAEAFSGRGKIAVVDPIFQGYGVIFANGERWRALRRFSLATMRDFGMGKRSVEERIQEEARCLVEELRKSKGALLDNTLLFHSITSNIICSIVFGKRFDYKDPVFLRLLDLFFQSFSLISSFSSQVFELFSGFLKYFPGTHRQIYRNLQEINTFIGQSVEKHRATLDPSNPRDFIDVYLLRMEKDKSDPSSEFHHQNLILTVLSLFFAGTETTSTTLRYGFLLMLKYPHVTERVQKEIEQVIGSHRPPALDDRAKMPYTDAVIHEIQRLGDLIPFGVPHTVTKDTQFRGYVIPKNTEVFPVLSSALHDPRYFETPNTFNPGHFLDANGALKRNEGFMPFSLGKRICAGEGIARTELFLFFTTILQNFSIASPVPPEDIDLTPRESGVGNVPPSYQIRFLARHHHH

Source Source

Source organism organism	Oryctolagus cuniculus
Common name common_name	European rabbit,Japanese white rabbit,domestic rabbit,rabbits
NCBI taxonomy ID ncbi_taxonomy_id	9986
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	4-(4-CHLOROPHENYL)IMIDAZOLE
Molecular weight formula_weight	178.6 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 4 Entity 4 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	290

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6. Fold Classification (SCOP + CATH) 4 domains

CATH v4.4 (4 domains)

Domain ID domain_id	3tk3A00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	630 — Cytochrome p450
Homologous superfamily homologous superfamily	10 — Cytochrome P450

Domain ID domain_id	3tk3B00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	630 — Cytochrome p450
Homologous superfamily homologous superfamily	10 — Cytochrome P450

Domain ID domain_id	3tk3C00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	630 — Cytochrome p450
Homologous superfamily homologous superfamily	10 — Cytochrome P450

Domain ID domain_id	3tk3D00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	630 — Cytochrome p450
Homologous superfamily homologous superfamily	10 — Cytochrome P450

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7. Citations (9)

;Investigation by site-directed mutagenesis of the role of cytochrome P450 2B4 non-active-site residues in protein-ligand interactions based on crystal structures of the ligand-bound enzyme. ;

Febs J. (2012)

PMID: 22051155 · DOI: 10.1111/j.1742-4658.2011.08411.x PRIMARY

;Structural Analysis of Mammalian Cytochrome P450 2B4 Covalently Bound to the Mechanism-Based Inactivator tert-Butylphenylacetylene: Insight into Partial Enzymatic Activity ;

Biochemistry (2011)

PMID: 21510666 · DOI: 10.1021/bi200482g

Structures of cytochrome P450 2B4 complexed with the antiplatelet drugs ticlopidine and clopidogrel .

Biochemistry (2010)

PMID: 20815363 · DOI: 10.1021/bi100914z

Plasticity of cytochrome P450 2B4 as investigated by hydrogen-deuterium exchange mass spectrometry and X-ray crystallography.

J.Biol.Chem. (2010)

PMID: 20880847 · DOI: 10.1074/jbc.M110.180646

;Crystal structures of cytochrome P450 2B4 in complex with the inhibitor 1-biphenyl-4-methyl-1H-imidazole: ligand-induced structural response through alpha-helical repositioning. ;

Biochemistry (2009)

PMID: 19397311 · DOI: 10.1021/bi9003765

Structural and thermodynamic consequences of 1-(4-chlorophenyl)imidazole binding to cytochrome P450 2B4.

Biochemistry (2007)

PMID: 17887776 · DOI: 10.1021/bi7011614

;Structure of microsomal cytochrome P450 2B4 complexed with the antifungal drug bifonazole: insight into P450 conformational plasticity and membrane interaction. ;

J.Biol.Chem. (2006)

PMID: 16373351 · DOI: 10.1074/jbc.M511464200

;Structure of mammalian cytochrome P450 2B4 complexed with 4-(4-chlorophenyl)imidazole at 1.9-A resolution: insight into the range of P450 conformations and the coordination of redox partner binding. ;

J.Biol.Chem. (2004)

PMID: 15100217 · DOI: 10.1074/jbc.M403349200

An open conformation of mammalian cytochrome P450 2B4 at 1.6-A resolution.

Proc.Natl.Acad.Sci.USA (2003)

PMID: 14563924 · DOI: 10.1073/pnas.2133986100

Unit-cell length a length_a	232.910 Å
Unit-cell length b length_b	232.910 Å
Unit-cell length c length_c	56.960 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	120.00 °
Molecules per unit cell Z z_pdb	12

Space group space_group	P 3
Space-group number int_tables_number	143
Crystal system crystal_system	—

Resolution resolution	2.800 Å
Low-resolution limit resolution_low	50.426 Å
R factor r_factor	0.1954
R_work r_work	0.1930
R_free r_free	0.2408

Cytochrome P450 2B4 mutant L437A in complex with 4-(4-chlorophenyl)imidazole

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

Cytochrome P450 2B4

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

3tk3__assembly_1__model_1

3tk3__assembly_1__model_1 | I(q)

3tk3__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) 4 domains

CATH v4.4 (4 domains)

7. Citations (9)

Cytochrome P450 2B4 mutant L437A in complex with 4-(4-chlorophenyl)imidazole

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

Cytochrome P450 2B4

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

3tk3__assembly_1__model_1

3tk3__assembly_1__model_1 | I(q)

3tk3__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) 4 domains

CATH v4.4 (4 domains)

7. Citations (9)