9nig

PB TCR in complex with HLA-DR4 presenting citrullinated Tenascin C peptide

Method: X-RAY DIFFRACTION

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

HLA class II histocompatibility antigen, DR alpha chain

Homo sapiens

UniProt P01903

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Other combination	Heteromer	Protein 5 其他Polymer 1	HLA class II histocompatibility antigen DR beta chain × 1 （A0A1V1IGJ9） PB TCR alpha chain × 1 PB TCR beta chain × 1 Tenascin × 1 （P24821） beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose × 1	Consistent with protein count
2	Protein heterocomplex	Heteromer	Protein 5	HLA class II histocompatibility antigen DR beta chain × 1 （A0A1V1IGJ9） PB TCR alpha chain × 1 PB TCR beta chain × 1 Tenascin × 1 （P24821） 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 1,2-ETHANEDIOL × 1	Consistent with protein count
3	Other combination	Heteromer	Protein 5 其他Polymer 1	HLA class II histocompatibility antigen DR beta chain × 1 （A0A1V1IGJ9） PB TCR alpha chain × 1 PB TCR beta chain × 1 Tenascin × 1 （P24821） 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose × 1 2-acetamido-2-deoxy-beta-D-glucopyranose × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	DRA_HUMAN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 5–181； UniProt 30–206 Author chain C； PDBConstruct 5–181； UniProt 30–206 Author chain H； PDBConstruct 5–181； UniProt 30–206

HLA class II histocompatibility antigen DR beta chain

Homo sapiens

UniProt A0A1V1IGJ9

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Other combination	Heteromer	Protein 5 其他Polymer 1	HLA class II histocompatibility antigen, DR alpha chain × 1 （P01903） PB TCR alpha chain × 1 PB TCR beta chain × 1 Tenascin × 1 （P24821） beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose × 1	Consistent with protein count
2	Protein heterocomplex	Heteromer	Protein 5	HLA class II histocompatibility antigen, DR alpha chain × 1 （P01903） PB TCR alpha chain × 1 PB TCR beta chain × 1 Tenascin × 1 （P24821） 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 1,2-ETHANEDIOL × 1	Consistent with protein count
3	Other combination	Heteromer	Protein 5 其他Polymer 1	HLA class II histocompatibility antigen, DR alpha chain × 1 （P01903） PB TCR alpha chain × 1 PB TCR beta chain × 1 Tenascin × 1 （P24821） 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose × 1 2-acetamido-2-deoxy-beta-D-glucopyranose × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	A0A1V1IGJ9_HUMAN
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain B； PDBConstruct 1–190； UniProt 31–220 Author chain D； PDBConstruct 1–190； UniProt 31–220 Author chain I； PDBConstruct 1–190； UniProt 31–220

Tenascin

OrganismNot specified

UniProt P24821

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Other combination	Heteromer	Protein 5 其他Polymer 1	HLA class II histocompatibility antigen, DR alpha chain × 1 （P01903） HLA class II histocompatibility antigen DR beta chain × 1 （A0A1V1IGJ9） PB TCR alpha chain × 1 PB TCR beta chain × 1 beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose × 1	Consistent with protein count
2	Protein heterocomplex	Heteromer	Protein 5	HLA class II histocompatibility antigen, DR alpha chain × 1 （P01903） HLA class II histocompatibility antigen DR beta chain × 1 （A0A1V1IGJ9） PB TCR alpha chain × 1 PB TCR beta chain × 1 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 1,2-ETHANEDIOL × 1	Consistent with protein count
3	Other combination	Heteromer	Protein 5 其他Polymer 1	HLA class II histocompatibility antigen, DR alpha chain × 1 （P01903） HLA class II histocompatibility antigen DR beta chain × 1 （A0A1V1IGJ9） PB TCR alpha chain × 1 PB TCR beta chain × 1 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose × 1 2-acetamido-2-deoxy-beta-D-glucopyranose × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	TENA_HUMAN
Isoform	—
PDB entities	5
Chains and sequence ranges	Author chain G； PDBConstruct 1–12； UniProt 1013–1024 Author chain L； PDBConstruct 1–12； UniProt 1013–1024 Author chain P； PDBConstruct 1–12； UniProt 1013–1024

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	9nig
Deposition date deposition_date	2025-02-26
Structure title title	PB TCR in complex with HLA-DR4 presenting citrullinated Tenascin C peptide
Keywords keywords	Human Leukocyte Antigen, T cell receptor, citrullinated epitope, rheumatoid arthritis., IMMUNE SYSTEM; IMMUNE SYSTEM
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.

9nig__assembly_1__model_1

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

Download this curve (.dat)

9nig__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

9nig__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	36.63 Å
Rg (electron density)	36.95 Å
Total Rg	37.11 Å
Atom count	6355
Residues	808
Excluded volume	111730 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`9nig__assembly_1__model_1`	pentameric （5）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`9nig__assembly_2__model_1`	pentameric （5）	Success	4.1.3-1-20251215 (887e7ef)	View Download
3	1	`9nig__assembly_3__model_1`	pentameric （5）	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 (9)

Entity 1 Entity 1 polymer

Description description	HLA class II histocompatibility antigen, DR alpha chain
Molecular weight formula_weight	21919.6 kDa
Source method src_method	man
Copy count entity_count	3

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,C,H
Atom count atom_count	18764

IKEEHVIIQAEFYLNPDQSGEFMFDFDGDEIFHVDMAKKETVWRLEEFGRFASFEAQGALANIAVDKANLEIMTKRSNYTPITNVPPEVTVLTNSPVELREPNVLICFIDKFTPPVVNVTWLRNGKPVTTGVSETVFLPREDHLFRKFHYLPFLPSTEDVYDCRVEHWGLDEPLLKHWEFDTSGDDDDK

Source Source

Source organism organism	Homo sapiens
Common name common_name	human
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	Homo sapiens

Entity 2 Entity 2 polymer

Description description	HLA class II histocompatibility antigen DR beta chain
Molecular weight formula_weight	22319.8 kDa
Source method src_method	man
Copy count entity_count	3

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	B,D,I

DTRPRFLEQVKHECHFFNGTERVRFLDRYFYHQEEYVRFDSDVGEYRAVTELGRPDAEYWNSQKDLLEQKRAAVDTYCRHNYGVGESFTVQRRVYPEVTVYPAKTQPLQHHNLLVCSVNGFYPGSIEVRWFRNGQEEKTGVVSTGLIQNGDWTFQTLVMLETVPRSGEVYTCQVEHPSLTSPLTVEWRAT

Source Source

Source organism organism	Homo sapiens
Common name common_name	human
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	Homo sapiens

Entity 3 Entity 3 polymer

Description description	PB TCR alpha chain
Molecular weight formula_weight	22779.1 kDa
Source method src_method	man
Copy count entity_count	3

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	M,E,J

MQQLNQSPQSMFIQEGEDVSMNCTSSSIFNTWLWYKQEPGEGPVLLIALYKAGELTSNGRLTAQFGITRKDSFLNISASIPSDVGIYFCAGQDVGNTNAGKSTFGDGTTLTVKPNIQNPDPAVYQLRDSKSSDKSVCLFTDFDSQTNVSQSKDSDVYITDKCVLDMRSMDFKSNSAVAWSNKSDFACANAFNNSIIPEDTFFPSPESS

Source Source

Source organism organism	Homo sapiens
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	Escherichia coli BL21(DE3)

Entity 4 Entity 4 polymer

Description description	PB TCR beta chain
Molecular weight formula_weight	27058.2 kDa
Source method src_method	man
Copy count entity_count	3

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	N,F,K

GITQSPRYKITETGRQVTLMCHQTWSHSYMFWYRQDLGHGLRLIYYSAAADITDKGEVPDGYVVSRSKTENFPLTLESATRSQTSVYFCASSGVPPVQFFGPGTRLTVLEDLNKVFPPEVAVFEPSEAEISHTQKATLVCLATGFFPDHVELSWWVNGKEVHSGVCTDPQPLKEQPALNDSRYALSSRLRVSATFWQNPRNHFRCQVQFYGLSENDEWTQDRAKPVTQIVSAEAWGRAD

Source Source

Source organism organism	Homo sapiens
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	Escherichia coli BL21(DE3)

Entity 5 Entity 5 polymer

Description description	Tenascin
Molecular weight formula_weight	1714.9 kDa
Source method src_method	syn
Copy count entity_count	3

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	P,G,L

DRYRLNYSLPTGKK

Entity 6 Entity 6 branched

Description description	beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
Molecular weight formula_weight	586.5 kDa
Source method src_method	man
Copy count entity_count	1

Entity 7 Entity 7 branched

Description description	2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
Molecular weight formula_weight	424.4 kDa
Source method src_method	man
Copy count entity_count	1

Entity 8 Entity 8 non-polymer

Description description	2-acetamido-2-deoxy-beta-D-glucopyranose
Molecular weight formula_weight	221.2 kDa
Source method src_method	man
Copy count entity_count	3

Entity 9 Entity 9 non-polymer

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

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Unit-cell length a length_a	76.928 Å
Unit-cell length b length_b	88.668 Å
Unit-cell length c length_c	126.070 Å
Unit-cell angle α angle_alpha	81.47 °
Unit-cell angle β angle_beta	76.75 °
Unit-cell angle γ angle_gamma	65.45 °
Molecules per unit cell Z z_pdb	3

Space group space_group	P 1
Space-group number int_tables_number	1
Crystal system crystal_system	triclinic

Resolution resolution	3.200 Å
Low-resolution limit resolution_low	44.320 Å
R factor r_factor	0.2209
R_work r_work	0.2187
R_free r_free	0.2604

PB TCR in complex with HLA-DR4 presenting citrullinated Tenascin C peptide

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

HLA class II histocompatibility antigen, DR alpha chain

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

HLA class II histocompatibility antigen DR beta chain

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Tenascin

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

9nig__assembly_1__model_1

9nig__assembly_1__model_1 | I(q)

9nig__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 (9)

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 polymer

Polymer Polymer

Source Source

Entity 5 Entity 5 polymer

Polymer Polymer

Entity 6 Entity 6 branched

Entity 7 Entity 7 branched

Entity 8 Entity 8 non-polymer

Entity 9 Entity 9 non-polymer

7. Citations (1)