SAXSdb — 4xxj

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

Bacteriorhodopsin

Halobacterium salinarum

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 3	EICOSANE × 33 [(Z)-octadec-9-enyl] (2R)-2,3-bis(oxidanyl)propanoate × 3 water × 3	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	BACR_HALSA
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 2–250； UniProt 14–262 Author chain B； PDBConstruct 2–250； UniProt 14–262 Author chain C； PDBConstruct 2–250； UniProt 14–262

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	4xxj
Deposition date deposition_date	2015-01-30
Structure title title	Crystal Structure of Escherichia coli-Expressed Halobacterium salinarum Bacteriorhodopsin in the Trimeric Form
Keywords keywords	ION TRANSPORT, PROTON PUMP; ION 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.

4xxj__assembly_1__model_1

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

Download this curve (.dat)

4xxj__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

4xxj__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	25.91 Å
Rg (electron density)	24.72 Å
Total Rg	25.92 Å
Atom count	5599
Residues	678
Excluded volume	106250 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`4xxj__assembly_1__model_1`	trimeric （3）	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	Bacteriorhodopsin
Molecular weight formula_weight	29403.3 kDa
Source method src_method	man
Copy count entity_count	3

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C
Atom count atom_count	5704

MQAQITGRPEWIWLALGTALMGLGTLYFLVKGMGVSDPDAKKFYAITTLVPAIAFTMYLSMLLGYGLTMVPFGGEQNPIYWARYADWLFTTPLLLLDLALLVDADQGTILALVGADGIMIGTGLVGALTKVYSYRFVWWAISTAAMLYILYVLFFGFTSKAESMRPEVASTFKVLRNVTVVLWSAYPVVWLIGSEGAGIVPLNIETLLFMVLDVSAKVGFGLILLRSRAIFGEAEAPEPSAGDGAAATSDGSGIEGRSGAPHHHHHHHH

Source Source

Source organism organism	Halobacterium salinarum
NCBI taxonomy ID ncbi_taxonomy_id	2242
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 non-polymer

Description description	EICOSANE
Molecular weight formula_weight	282.5 kDa
Source method src_method	syn
Copy count entity_count	33

Entity 3 Entity 3 non-polymer

Description description	[(Z)-octadec-9-enyl] (2R)-2,3-bis(oxidanyl)propanoate
Molecular weight formula_weight	356.5 kDa
Source method src_method	syn
Copy count entity_count	3

Entity 4 Entity 4 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	90

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6. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (3 domains)

Domain ID domain_id	d4xxja_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.13 — Class A G protein-coupled receptor (GPCR)-like
Superfamily Superfamily superfamily	f.13.1 — Class A G protein-coupled receptor (GPCR)-like
Family Family family	f.13.1.1 — Bacteriorhodopsin-like

Domain ID domain_id	d4xxjb_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.13 — Class A G protein-coupled receptor (GPCR)-like
Superfamily Superfamily superfamily	f.13.1 — Class A G protein-coupled receptor (GPCR)-like
Family Family family	f.13.1.1 — Bacteriorhodopsin-like

Domain ID domain_id	d4xxjc_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.13 — Class A G protein-coupled receptor (GPCR)-like
Superfamily Superfamily superfamily	f.13.1 — Class A G protein-coupled receptor (GPCR)-like
Family Family family	f.13.1.1 — Bacteriorhodopsin-like

CATH v4.4 (3 domains)

Domain ID domain_id	4xxjA00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	1070 — Rhopdopsin 7-helix transmembrane proteins
Homologous superfamily homologous superfamily	10 — Rhodopsin 7-helix transmembrane proteins

Domain ID domain_id	4xxjB00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	1070 — Rhopdopsin 7-helix transmembrane proteins
Homologous superfamily homologous superfamily	10 — Rhodopsin 7-helix transmembrane proteins

Domain ID domain_id	4xxjC00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	1070 — Rhopdopsin 7-helix transmembrane proteins
Homologous superfamily homologous superfamily	10 — Rhodopsin 7-helix transmembrane proteins

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Unit-cell length a length_a	105.840 Å
Unit-cell length b length_b	60.760 Å
Unit-cell length c length_c	113.360 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	99.78 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	12

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

Resolution resolution	1.900 Å
Low-resolution limit resolution_low	49.200 Å
R factor r_factor	0.1850
R_work r_work	0.1835
R_free r_free	0.2139

Crystal Structure of Escherichia coli-Expressed Halobacterium salinarum Bacteriorhodopsin in the Trimeric Form

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

Bacteriorhodopsin

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

4xxj__assembly_1__model_1

4xxj__assembly_1__model_1 | I(q)

4xxj__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) 6 domains

SCOP 2.08 (3 domains)

CATH v4.4 (3 domains)

7. Citations (1)

Crystal Structure of Escherichia coli-Expressed Halobacterium salinarum Bacteriorhodopsin in the Trimeric Form

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

Bacteriorhodopsin

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

4xxj__assembly_1__model_1

4xxj__assembly_1__model_1 | I(q)

4xxj__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) 6 domains

SCOP 2.08 (3 domains)

CATH v4.4 (3 domains)

7. Citations (1)