SAXSdb — 1xj4

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

Sensor protein fixL

Bradyrhizobium japonicum

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein monomer	Monomer	Protein 1	SODIUM ION × 2 CHLORIDE ION × 1 PROTOPORPHYRIN IX CONTAINING FE × 1 CARBON MONOXIDE × 1 water × 1	Consistent with protein count
2	Protein monomer	Monomer	Protein 1	PROTOPORPHYRIN IX CONTAINING FE × 1 CARBON MONOXIDE × 1 water × 1	Consistent with protein count
3	Protein homooligomer	Homooligomer	Protein 4	SODIUM ION × 4 CHLORIDE ION × 2 PROTOPORPHYRIN IX CONTAINING FE × 4 CARBON MONOXIDE × 4 water × 4	Consistent with protein count
4	Protein homooligomer	Homooligomer	Protein 4	SODIUM ION × 4 CHLORIDE ION × 2 PROTOPORPHYRIN IX CONTAINING FE × 4 CARBON MONOXIDE × 4 water × 4	Consistent with protein count
5	Protein homooligomer	Homooligomer	Protein 2	SODIUM ION × 2 CHLORIDE ION × 1 PROTOPORPHYRIN IX CONTAINING FE × 2 CARBON MONOXIDE × 2 water × 2	Consistent with protein count
6	Protein homooligomer	Homooligomer	Protein 2	SODIUM ION × 4 CHLORIDE ION × 2 PROTOPORPHYRIN IX CONTAINING FE × 2 CARBON MONOXIDE × 2 water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	FIXL_BRAJA
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–119； UniProt 151–269 Author chain B； PDBConstruct 1–119； UniProt 151–269

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	1xj4
Deposition date deposition_date	2004-09-22
Structure title title	CO-bound structure of BjFixLH
Keywords keywords	PAS domain; heme; oxygen sensor; carbon monoxide, SIGNALING PROTEIN, TRANSFERASE; SIGNALING PROTEIN, TRANSFERASE
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.

1xj4__assembly_1__model_1

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

Download this curve (.dat)

1xj4__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1xj4__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	14.36 Å
Rg (electron density)	12.92 Å
Total Rg	14.18 Å
Atom count	873
Residues	106
Excluded volume	15474 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1xj4__assembly_1__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`1xj4__assembly_2__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
3	1	`1xj4__assembly_3__model_1`	tetrameric （4）	Success	4.1.3-1-20251215 (887e7ef)	View Download
4	1	`1xj4__assembly_4__model_1`	tetrameric （4）	Success	4.1.3-1-20251215 (887e7ef)	View Download
5	1	`1xj4__assembly_5__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
6	1	`1xj4__assembly_6__model_1`	dimeric （2）	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 (6)

Entity 1 Entity 1 polymer

Description description	Sensor protein fixL
Molecular weight formula_weight	13413.1 kDa
EC 编号 ec_number	2.7.3.-
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B
Atom count atom_count	1835

TIPDAMIVIDGHGIIQLFSTAAERLFGWSELEAIGQNVNILMPEPDRSRHDSYISRYRTTSDPHIIGIGRIVTGKRRDGTTFPMHLSIGEMQSGGEPYFTGFVRDLTEHQQTQARLQEL

Source Source

Source organism organism	Bradyrhizobium japonicum
NCBI taxonomy ID ncbi_taxonomy_id	375
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 non-polymer

Description description	SODIUM ION
Molecular weight formula_weight	23.0 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 3 Entity 3 non-polymer

Description description	CHLORIDE ION
Molecular weight formula_weight	35.5 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 4 Entity 4 non-polymer

Description description	PROTOPORPHYRIN IX CONTAINING FE
Molecular weight formula_weight	616.5 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 5 Entity 5 non-polymer

Description description	CARBON MONOXIDE
Molecular weight formula_weight	28.0 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 6 Entity 6 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	81

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6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d1xj4a_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.110 — Profilin-like
Superfamily Superfamily superfamily	d.110.3 — PYP-like sensor domain (PAS domain)
Family Family family	d.110.3.2 — Heme-binding PAS domain

Domain ID domain_id	d1xj4b_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.110 — Profilin-like
Superfamily Superfamily superfamily	d.110.3 — PYP-like sensor domain (PAS domain)
Family Family family	d.110.3.2 — Heme-binding PAS domain

CATH v4.4 (2 domains)

Domain ID domain_id	1xj4A00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	450 — Beta-Lactamase
Homologous superfamily homologous superfamily	20 — PAS domain

Domain ID domain_id	1xj4B00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	450 — Beta-Lactamase
Homologous superfamily homologous superfamily	20 — PAS domain

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Unit-cell length a length_a	81.132 Å
Unit-cell length b length_b	59.642 Å
Unit-cell length c length_c	59.458 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	111.75 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	8

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

Resolution resolution	1.800 Å
Low-resolution limit resolution_low	40.000 Å
R factor r_factor	—
R_work r_work	0.2170
R_free r_free	0.2470

CO-bound structure of BjFixLH

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

Sensor protein fixL

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

1xj4__assembly_1__model_1

1xj4__assembly_1__model_1 | I(q)

1xj4__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 (6)

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 non-polymer

Entity 5 Entity 5 non-polymer

Entity 6 Entity 6 water

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)

CO-bound structure of BjFixLH

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

Sensor protein fixL

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

1xj4__assembly_1__model_1

1xj4__assembly_1__model_1 | I(q)

1xj4__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 (6)

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 non-polymer

Entity 5 Entity 5 non-polymer

Entity 6 Entity 6 water

6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)