9bx7

Fab 8C1 in complex with OspCA peptide P20 (residues 131-150)

Method: X-RAY DIFFRACTION

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

P20 peptide from Outer surface protein C

Borreliella burgdorferi

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 3	8C1 Fab Heavy Chain × 1 8C1 Fab Light Chain × 1 SULFATE ION × 4 1,2-ETHANEDIOL × 1 CHLORIDE ION × 2 water × 3	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	OSPC_BORBU
Isoform	—
PDB entities	3
Chains and sequence ranges	Author chain P； PDBConstruct 1–20； UniProt 131–150

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	9bx7
Deposition date deposition_date	2024-05-22
Last revision last_revision	2025-08-27
Structure title title	Fab 8C1 in complex with OspCA peptide P20 (residues 131-150)
Keywords keywords	;Human monoclonal Fab 8C1 in complex with Outer Surface Protein C type A P20 peptide (residues 131-150), IMMUNE SYSTEM, IMMUNE SYSTEM-ANTIGEN complex ;; IMMUNE SYSTEM/ANTIGEN
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.

9bx7__assembly_1__model_1

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

Download this curve (.dat)

9bx7__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

9bx7__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	25.16 Å
Rg (electron density)	24.29 Å
Total Rg	25.12 Å
Atom count	6577
Residues	439
Excluded volume	59991 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`9bx7__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 (7)

Entity 1 Entity 1 polymer

Description description	8C1 Fab Heavy Chain
Molecular weight formula_weight	23659.5 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	H
Atom count atom_count	6984

EVQLQQSGPELVKPGASVKISCKTSGYTFSNSWMNWVKQRPGQGLEWIGRIYPGDGDTNYNGKFKDKATLTTDKSSSTAYMRLSSLTSVDSAVYFCARSLFDYWGQGTTLTVSSASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWNSGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICNVNHKPSNTKVDKRVEPKSCDKTH

Source Source

Source organism organism	Homo sapiens
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	Cricetulus griseus

Entity 2 Entity 2 polymer

Description description	8C1 Fab Light Chain
Molecular weight formula_weight	23966.0 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	L

DVVMTQTPLTLSVTIGQPASISCKSSQSLLDSDGKTYLIWLLQRPGQSPKRLIYLVSKLDSGVPDRFTGSGSGTDFTLKISRVEAEDLGVYYCCQGTHFPFTFGVGTKLELKRTVAAPSVFIFPPSDEQLKSGTASVVCLLNNFYPREAKVQWKVDNALQSGNSQESVTEQDSKDSTYSLSSTLTLSKADYEKHKVYACEVTHQGLSSPVTKSFNRGEC

Source Source

Source organism organism	Homo sapiens
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	Cricetulus griseus

Entity 3 Entity 3 polymer

Description description	P20 peptide from Outer surface protein C
Molecular weight formula_weight	2266.5 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	P

SETFTNKLKEKHTDLGKEGV

Source Source

Source organism organism	Borreliella burgdorferi
NCBI taxonomy ID ncbi_taxonomy_id	224326
Host organism host_organism	Escherichia coli B

Entity 4 Entity 4 non-polymer

Description description	SULFATE ION
Molecular weight formula_weight	96.1 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 5 Entity 5 non-polymer

Description description	1,2-ETHANEDIOL
Molecular weight formula_weight	62.1 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 6 Entity 6 non-polymer

Description description	CHLORIDE ION
Molecular weight formula_weight	35.5 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 7 Entity 7 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	332

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Unit-cell length a length_a	106.146 Å
Unit-cell length b length_b	106.146 Å
Unit-cell length c length_c	71.485 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	6

Space group space_group	P 65
Space-group number int_tables_number	170
Crystal system crystal_system	hexagonal

Resolution resolution	1.700 Å
Low-resolution limit resolution_low	33.310 Å
R factor r_factor	0.1768
R_work r_work	0.1757
R_free r_free	0.1967

Fab 8C1 in complex with OspCA peptide P20 (residues 131-150)

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

P20 peptide from Outer surface protein C

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

9bx7__assembly_1__model_1

9bx7__assembly_1__model_1 | I(q)

9bx7__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 (7)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 polymer

Polymer Polymer

Source Source

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 non-polymer

Entity 6 Entity 6 non-polymer

Entity 7 Entity 7 water

7. Citations (1)

Fab 8C1 in complex with OspCA peptide P20 (residues 131-150)

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

P20 peptide from Outer surface protein C

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

9bx7__assembly_1__model_1

9bx7__assembly_1__model_1 | I(q)

9bx7__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 (7)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 polymer

Polymer Polymer

Source Source

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 non-polymer

Entity 6 Entity 6 non-polymer

Entity 7 Entity 7 water

7. Citations (1)