SAXSdb — 2fkj

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

Outer Surface Protein A

Borrelia burgdorferi

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 3	No other associated polymer	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	Q45040_BORBU
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 5–366； UniProt 27–273 Author chain B； PDBConstruct 5–366； UniProt 27–273 Author chain C； PDBConstruct 5–366； UniProt 27–273

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	2fkj
Deposition date deposition_date	2006-01-04
Structure title title	The crystal structure of engineered OspA
Keywords keywords	BETA SHEET, DE NOVO PROTEIN; DE NOVO 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.

2fkj__assembly_1__model_1

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

Download this curve (.dat)

2fkj__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

2fkj__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	40.62 Å
Rg (electron density)	40.98 Å
Total Rg	41.14 Å
Atom count	8334
Residues	1083
Excluded volume	148400 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`2fkj__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 (1)

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6. Fold Classification (SCOP + CATH) 9 domains

CATH v4.4 (9 domains)

Domain ID domain_id	2fkjA01
Class class	2 — Mainly Beta
Architecture architecture	40 — Beta Barrel
Topology topology	128 — Lipocalin
Homologous superfamily homologous superfamily	160 — C1 set domains (antibody constant domain-like)

Domain ID domain_id	2fkjA02
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	930 — Outer Surface Protein A; domain 3
Homologous superfamily homologous superfamily	1 —

Domain ID domain_id	2fkjA03
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	930 — Outer Surface Protein A; domain 3
Homologous superfamily homologous superfamily	1 —

Domain ID domain_id	2fkjB01
Class class	2 — Mainly Beta
Architecture architecture	40 — Beta Barrel
Topology topology	128 — Lipocalin
Homologous superfamily homologous superfamily	160 — C1 set domains (antibody constant domain-like)

Domain ID domain_id	2fkjB02
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	930 — Outer Surface Protein A; domain 3
Homologous superfamily homologous superfamily	1 —

Domain ID domain_id	2fkjB03
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	930 — Outer Surface Protein A; domain 3
Homologous superfamily homologous superfamily	1 —

Domain ID domain_id	2fkjC01
Class class	2 — Mainly Beta
Architecture architecture	40 — Beta Barrel
Topology topology	128 — Lipocalin
Homologous superfamily homologous superfamily	160 — C1 set domains (antibody constant domain-like)

Domain ID domain_id	2fkjC02
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	930 — Outer Surface Protein A; domain 3
Homologous superfamily homologous superfamily	1 —

Domain ID domain_id	2fkjC03
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	930 — Outer Surface Protein A; domain 3
Homologous superfamily homologous superfamily	1 —

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Unit-cell length a length_a	72.150 Å
Unit-cell length b length_b	105.500 Å
Unit-cell length c length_c	88.981 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	93.24 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	6

Space group space_group	P 1 21 1
Space-group number int_tables_number	4
Crystal system crystal_system	—

Resolution resolution	3.100 Å
Low-resolution limit resolution_low	20.000 Å
R factor r_factor	0.2487
R_work r_work	0.2470
R_free r_free	0.2816

Description description	Outer Surface Protein A
Molecular weight formula_weight	40221.0 kDa
Source method src_method	man
Copy count entity_count	3

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C
Atom count atom_count	8334

The crystal structure of engineered OspA

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

Outer Surface Protein A

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

2fkj__assembly_1__model_1

2fkj__assembly_1__model_1 | I(q)

2fkj__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 (1)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

6. Fold Classification (SCOP + CATH) 9 domains

CATH v4.4 (9 domains)

7. Citations (1)

Source organism organism	Borrelia burgdorferi
Common name common_name	Lyme disease spirochete
NCBI taxonomy ID ncbi_taxonomy_id	139
Host organism host_organism	Escherichia coli

The crystal structure of engineered OspA

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

Outer Surface Protein A

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

2fkj__assembly_1__model_1

2fkj__assembly_1__model_1 | I(q)

2fkj__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 (1)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

6. Fold Classification (SCOP + CATH) 9 domains

CATH v4.4 (9 domains)

7. Citations (1)