2icw

Crystal structure of a complete ternary complex between TCR, superantigen, and peptide-MHC class II molecule

Method: X-RAY DIFFRACTION Dmax: 128.5 Å Quality: REASONABLE

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 Oligomeric State Construct Mutations and Modifications Ligands, Ions and Associated Components Method and Experimental Conditions Structure Quality
1 Protein heterocomplex Heteromer Protein × 6 PDB declaration: hexameric(6) Consistent with protein copy count Chain A; UniProt 28–206 Fragment:residues 28-206 Non-standard monomer:Yes (specific site not provided by mmCIF) HLA class II histocompatibility antigen, DRB1-1 beta chain × 1 (P04229) haemagglutinin peptide × 1 Mycoplasma arthritidis mitogen × 1 (Q48898) T-cell receptor alpha chain V × 1 (P01738) T-cell receptor beta chain V × 1 (P04213) X-RAY DIFFRACTION X-ray crystallization conditions:EVAPORATION;pH 5.6;298 K;13-15% PEG 4000, 5% isopropanol, 0.1 M sodium citrate, 2 mM zinc acetate, pH 5.6, EVAPORATION, temperature 298K Resolution 2.41 Å R-free 0.288
2 Protein heterocomplex Heteromer Protein × 6 PDB declaration: hexameric(6) Consistent with protein copy count Chain D; UniProt 28–206 Fragment:residues 28-206 Non-standard monomer:Yes (specific site not provided by mmCIF) HLA class II histocompatibility antigen, DRB1-1 beta chain × 1 (P04229) haemagglutinin peptide × 1 Mycoplasma arthritidis mitogen × 1 (Q48898) T-cell receptor alpha chain V × 1 (P01738) T-cell receptor beta chain V × 1 (P04213) X-RAY DIFFRACTION X-ray crystallization conditions:EVAPORATION;pH 5.6;298 K;13-15% PEG 4000, 5% isopropanol, 0.1 M sodium citrate, 2 mM zinc acetate, pH 5.6, EVAPORATION, temperature 298K Resolution 2.41 Å R-free 0.288

Other States of the Same Protein in the Database

Each row is a biological assembly of the same UniProt protein in another PDB entry. The “Difference from current entry” column identifies evidence-level differences; no tag means the currently parsed fields agree.

139 other PDB entries and 218 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name 2DRA_HUMAN
Isoform
PDB entities 1
Chains and sequence ranges Author chain A; PDBConstruct 1–179; UniProt 28–206 Author chain D; PDBConstruct 1–179; UniProt 28–206

HLA class II histocompatibility antigen, DRB1-1 beta chain

Homo sapiens

UniProt P04229

State in the Current Structure

Assembly Oligomeric State Construct Mutations and Modifications Ligands, Ions and Associated Components Method and Experimental Conditions Structure Quality
1 Protein heterocomplex Heteromer Protein × 6 PDB declaration: hexameric(6) Consistent with protein copy count Chain B; UniProt 30–219 Fragment:residues 30-219 HLA class II histocompatibility antigen, DR alpha chain × 1 (P01903) haemagglutinin peptide × 1 Mycoplasma arthritidis mitogen × 1 (Q48898) T-cell receptor alpha chain V × 1 (P01738) T-cell receptor beta chain V × 1 (P04213) X-RAY DIFFRACTION X-ray crystallization conditions:EVAPORATION;pH 5.6;298 K;13-15% PEG 4000, 5% isopropanol, 0.1 M sodium citrate, 2 mM zinc acetate, pH 5.6, EVAPORATION, temperature 298K Resolution 2.41 Å R-free 0.288
2 Protein heterocomplex Heteromer Protein × 6 PDB declaration: hexameric(6) Consistent with protein copy count Chain E; UniProt 30–219 Fragment:residues 30-219 HLA class II histocompatibility antigen, DR alpha chain × 1 (P01903) haemagglutinin peptide × 1 Mycoplasma arthritidis mitogen × 1 (Q48898) T-cell receptor alpha chain V × 1 (P01738) T-cell receptor beta chain V × 1 (P04213) X-RAY DIFFRACTION X-ray crystallization conditions:EVAPORATION;pH 5.6;298 K;13-15% PEG 4000, 5% isopropanol, 0.1 M sodium citrate, 2 mM zinc acetate, pH 5.6, EVAPORATION, temperature 298K Resolution 2.41 Å R-free 0.288

Other States of the Same Protein in the Database

Each row is a biological assembly of the same UniProt protein in another PDB entry. The “Difference from current entry” column identifies evidence-level differences; no tag means the currently parsed fields agree.

48 other PDB entries and 82 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name 2B11_HUMAN
Isoform
PDB entities 2
Chains and sequence ranges Author chain B; PDBConstruct 1–190; UniProt 30–219 Author chain E; PDBConstruct 1–190; UniProt 30–219

Mycoplasma arthritidis mitogen

Mycoplasma arthritidis

UniProt Q48898

State in the Current Structure

Assembly Oligomeric State Construct Mutations and Modifications Ligands, Ions and Associated Components Method and Experimental Conditions Structure Quality
1 Protein heterocomplex Heteromer Protein × 6 PDB declaration: hexameric(6) Consistent with protein copy count Chain G; UniProt 26–238 Fragment:residues 26-238 HLA class II histocompatibility antigen, DR alpha chain × 1 (P01903) HLA class II histocompatibility antigen, DRB1-1 beta chain × 1 (P04229) haemagglutinin peptide × 1 T-cell receptor alpha chain V × 1 (P01738) T-cell receptor beta chain V × 1 (P04213) X-RAY DIFFRACTION X-ray crystallization conditions:EVAPORATION;pH 5.6;298 K;13-15% PEG 4000, 5% isopropanol, 0.1 M sodium citrate, 2 mM zinc acetate, pH 5.6, EVAPORATION, temperature 298K Resolution 2.41 Å R-free 0.288
2 Protein heterocomplex Heteromer Protein × 6 PDB declaration: hexameric(6) Consistent with protein copy count Chain H; UniProt 26–238 Fragment:residues 26-238 HLA class II histocompatibility antigen, DR alpha chain × 1 (P01903) HLA class II histocompatibility antigen, DRB1-1 beta chain × 1 (P04229) haemagglutinin peptide × 1 T-cell receptor alpha chain V × 1 (P01738) T-cell receptor beta chain V × 1 (P04213) X-RAY DIFFRACTION X-ray crystallization conditions:EVAPORATION;pH 5.6;298 K;13-15% PEG 4000, 5% isopropanol, 0.1 M sodium citrate, 2 mM zinc acetate, pH 5.6, EVAPORATION, temperature 298K Resolution 2.41 Å R-free 0.288

Other States of the Same Protein in the Database

Each row is a biological assembly of the same UniProt protein in another PDB entry. The “Difference from current entry” column identifies evidence-level differences; no tag means the currently parsed fields agree.

4 other PDB entries and 7 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name Q48898_MYCAT
Isoform
PDB entities 4
Chains and sequence ranges Author chain G; PDBConstruct 1–213; UniProt 26–238 Author chain H; PDBConstruct 1–213; UniProt 26–238

T-cell receptor alpha chain V

Mus musculus

UniProt P01738

State in the Current Structure

Assembly Oligomeric State Construct Mutations and Modifications Ligands, Ions and Associated Components Method and Experimental Conditions Structure Quality
1 Protein heterocomplex Heteromer Protein × 6 PDB declaration: hexameric(6) Consistent with protein copy count Chain I; UniProt 21–130 Fragment:residues 21-131 Mutation:W82R, L43P HLA class II histocompatibility antigen, DR alpha chain × 1 (P01903) HLA class II histocompatibility antigen, DRB1-1 beta chain × 1 (P04229) haemagglutinin peptide × 1 Mycoplasma arthritidis mitogen × 1 (Q48898) T-cell receptor beta chain V × 1 (P04213) X-RAY DIFFRACTION X-ray crystallization conditions:EVAPORATION;pH 5.6;298 K;13-15% PEG 4000, 5% isopropanol, 0.1 M sodium citrate, 2 mM zinc acetate, pH 5.6, EVAPORATION, temperature 298K Resolution 2.41 Å R-free 0.288
2 Protein heterocomplex Heteromer Protein × 6 PDB declaration: hexameric(6) Consistent with protein copy count Chain K; UniProt 21–130 Fragment:residues 21-131 Mutation:W82R, L43P HLA class II histocompatibility antigen, DR alpha chain × 1 (P01903) HLA class II histocompatibility antigen, DRB1-1 beta chain × 1 (P04229) haemagglutinin peptide × 1 Mycoplasma arthritidis mitogen × 1 (Q48898) T-cell receptor beta chain V × 1 (P04213) X-RAY DIFFRACTION X-ray crystallization conditions:EVAPORATION;pH 5.6;298 K;13-15% PEG 4000, 5% isopropanol, 0.1 M sodium citrate, 2 mM zinc acetate, pH 5.6, EVAPORATION, temperature 298K Resolution 2.41 Å R-free 0.288

Other States of the Same Protein in the Database

Each row is a biological assembly of the same UniProt protein in another PDB entry. The “Difference from current entry” column identifies evidence-level differences; no tag means the currently parsed fields agree.

5 other PDB entries and 13 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name TVA1_MOUSE
Isoform
PDB entities 5
Chains and sequence ranges Author chain I; PDBConstruct 1–110; UniProt 21–130 Author chain K; PDBConstruct 1–110; UniProt 21–130

T-cell receptor beta chain V

Mus musculus

UniProt P04213

State in the Current Structure

Assembly Oligomeric State Construct Mutations and Modifications Ligands, Ions and Associated Components Method and Experimental Conditions Structure Quality
1 Protein heterocomplex Heteromer Protein × 6 PDB declaration: hexameric(6) Consistent with protein copy count Chain J; UniProt 9–88 Mutation:G17E, G42E, L80S HLA class II histocompatibility antigen, DR alpha chain × 1 (P01903) HLA class II histocompatibility antigen, DRB1-1 beta chain × 1 (P04229) haemagglutinin peptide × 1 Mycoplasma arthritidis mitogen × 1 (Q48898) T-cell receptor alpha chain V × 1 (P01738) X-RAY DIFFRACTION X-ray crystallization conditions:EVAPORATION;pH 5.6;298 K;13-15% PEG 4000, 5% isopropanol, 0.1 M sodium citrate, 2 mM zinc acetate, pH 5.6, EVAPORATION, temperature 298K Resolution 2.41 Å R-free 0.288
2 Protein heterocomplex Heteromer Protein × 6 PDB declaration: hexameric(6) Consistent with protein copy count Chain L; UniProt 9–88 Mutation:G17E, G42E, L80S HLA class II histocompatibility antigen, DR alpha chain × 1 (P01903) HLA class II histocompatibility antigen, DRB1-1 beta chain × 1 (P04229) haemagglutinin peptide × 1 Mycoplasma arthritidis mitogen × 1 (Q48898) T-cell receptor alpha chain V × 1 (P01738) X-RAY DIFFRACTION X-ray crystallization conditions:EVAPORATION;pH 5.6;298 K;13-15% PEG 4000, 5% isopropanol, 0.1 M sodium citrate, 2 mM zinc acetate, pH 5.6, EVAPORATION, temperature 298K Resolution 2.41 Å R-free 0.288

Other States of the Same Protein in the Database

Each row is a biological assembly of the same UniProt protein in another PDB entry. The “Difference from current entry” column identifies evidence-level differences; no tag means the currently parsed fields agree.

9 other PDB entries and 15 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name TVB5_MOUSE
Isoform
PDB entities 6
Chains and sequence ranges Author chain J; PDBConstruct 1–80; UniProt 9–88 Author chain L; PDBConstruct 1–80; UniProt 9–88

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.

SAXS scattering curve SAXS Profile

SAXS profile for 2icw

P(r) Distance Distribution P(r) Distribution

P(r) distribution for 2icw
Download Download

2. Structure Basics 2. Structure Basics

Entry ID entry_id2icw
Deposition date deposition_date2006-09-13
Structure title titleCrystal structure of a complete ternary complex between TCR, superantigen, and peptide-MHC class II molecule
Keywords keywordsTCR, MHC, superantigen, protein-protein complex, IMMUNE SYSTEM; IMMUNE SYSTEM
Experimental Method methodX-RAY DIFFRACTION

3. SAXS Parameters (CRYSOL theoretical calculation) 3. SAXS Parameters (CRYSOL)

Radius of gyration Rg (Guinier) rg_guinier39.84
Radius of gyration Rg (electron density) rg_electron39.12
Forward intensity I(0) i0512368000.00
Molecular weight molecular_weight186450.0 kDa
Excluded volume excluded_volume233730 ų
Envelope volume envelope_volume311420 ų
Hydration-shell volume shell_volume65422 ų
Envelope diameter envelope_diameter137.2
Shell Rg shell_rg45.77
Envelope Rg envelope_rg38.77
Shape Rg shape_rg39.09
Total Rg total_rg39.59
Total atoms total_atoms13152
Residues n_residues1616
Spherical-harmonic order n_harmonics20
q range q_range— – 0.5000 −1
Data points n_points101
Shell type shell_typedirectional
Solvent electron density solvent_density0.3340 e/ų
Shell contrast contrast_shell0.0300 e/ų
CRYSOL version crysol_version4.1.3

4. P(r) Distance Distribution (GNOM inversion) 4. P(r) Analysis (GNOM)

Maximum dimension Dmax dmax128.5
Rg (real space) rg_real39.70
Rg uncertainty (real space) rg_real_error0.88
I(0) (real space) i0_real5.1240e+08
I(0) uncertainty (real space) i0_real_error8.1540e+06
Rg (reciprocal space) rg_reciprocal39.79
I(0) (reciprocal space) i0_reciprocal512400000.0000
Solution quality estimate total_estimate0.6590
Solution quality rating solution_quality REASONABLE a REASONABLE solution
P(r) peaks n_peaks2
Primary peak position r_peak_primary48.2
Skewness Skewness skewness0.254
Kurtosis Kurtosis kurtosis-0.336
Angular range angular_range— – 0.2000 −1
Current regularization parameter α current_alpha0.0000
Highest regularization parameter α highest_alpha66870000.0000
Real-space data points n_real_points41
GNOM version gnom_version4.1.3
Quality Criteria quality_criteria AN1: 0.000; Oscil: 0.893; Stabil: 1.000; Sysdev: 0.013; Positv: 1.000; Valcen: 0.996; Smooth: 0.850

5. Crystallography and Experiment 5. Crystallography & Experiment

6. Entities and Polymers Entities & Polymers (7)

7. Fold Classification (SCOP + CATH) 30 domains

SCOP 2.08 (14 domains)

Domain ID domain_idd2icwa1
Class classb — All beta proteins
Fold Fold foldb.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamilyb.1.1 — Immunoglobulin
Family Family familyb.1.1.2 — C1 set domains (antibody constant domain-like)
Domain ID domain_idd2icwa2
Class classd — Alpha and beta proteins (a+b)
Fold Fold foldd.19 — MHC antigen-recognition domain
Superfamily Superfamily superfamilyd.19.1 — MHC antigen-recognition domain
Family Family familyd.19.1.1 — MHC antigen-recognition domain
Domain ID domain_idd2icwb1
Class classb — All beta proteins
Fold Fold foldb.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamilyb.1.1 — Immunoglobulin
Family Family familyb.1.1.2 — C1 set domains (antibody constant domain-like)
Domain ID domain_idd2icwb2
Class classd — Alpha and beta proteins (a+b)
Fold Fold foldd.19 — MHC antigen-recognition domain
Superfamily Superfamily superfamilyd.19.1 — MHC antigen-recognition domain
Family Family familyd.19.1.1 — MHC antigen-recognition domain
Domain ID domain_idd2icwd1
Class classb — All beta proteins
Fold Fold foldb.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamilyb.1.1 — Immunoglobulin
Family Family familyb.1.1.2 — C1 set domains (antibody constant domain-like)
Domain ID domain_idd2icwd2
Class classd — Alpha and beta proteins (a+b)
Fold Fold foldd.19 — MHC antigen-recognition domain
Superfamily Superfamily superfamilyd.19.1 — MHC antigen-recognition domain
Family Family familyd.19.1.1 — MHC antigen-recognition domain
Domain ID domain_idd2icwe1
Class classb — All beta proteins
Fold Fold foldb.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamilyb.1.1 — Immunoglobulin
Family Family familyb.1.1.2 — C1 set domains (antibody constant domain-like)
Domain ID domain_idd2icwe2
Class classd — Alpha and beta proteins (a+b)
Fold Fold foldd.19 — MHC antigen-recognition domain
Superfamily Superfamily superfamilyd.19.1 — MHC antigen-recognition domain
Family Family familyd.19.1.1 — MHC antigen-recognition domain
Domain ID domain_idd2icwg_
Class classa — All alpha proteins
Fold Fold folda.202 — Superantigen MAM
Superfamily Superfamily superfamilya.202.1 — Superantigen MAM
Family Family familya.202.1.1 — Superantigen MAM
Domain ID domain_idd2icwh_
Class classa — All alpha proteins
Fold Fold folda.202 — Superantigen MAM
Superfamily Superfamily superfamilya.202.1 — Superantigen MAM
Family Family familya.202.1.1 — Superantigen MAM
Domain ID domain_idd2icwj1
Class classb — All beta proteins
Fold Fold foldb.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamilyb.1.1 — Immunoglobulin
Family Family familyb.1.1.1 — V set domains (antibody variable domain-like)
Domain ID domain_idd2icwj2
Class classl — Artifacts
Fold Fold foldl.1 — Tags
Superfamily Superfamily superfamilyl.1.1 — Tags
Family Family familyl.1.1.1 — Tags
Domain ID domain_idd2icwl2
Class classb — All beta proteins
Fold Fold foldb.1 — Immunoglobulin-like beta-sandwich
Superfamily Superfamily superfamilyb.1.1 — Immunoglobulin
Family Family familyb.1.1.1 — V set domains (antibody variable domain-like)
Domain ID domain_idd2icwl3
Class classl — Artifacts
Fold Fold foldl.1 — Tags
Superfamily Superfamily superfamilyl.1.1 — Tags
Family Family familyl.1.1.1 — Tags

CATH v4.4 (16 domains)

Domain ID domain_id2icwA01
Class class3 — Alpha Beta
Architecture architecture10 — Roll
Topology topology320 — Class II Histocompatibility Antigen, M Beta Chain; Chain B, domain 1
Homologous superfamily homologous superfamily10 — Class II Histocompatibility Antigen, M Beta Chain; Chain B, domain 1
Domain ID domain_id2icwA02
Class class2 — Mainly Beta
Architecture architecture60 — Sandwich
Topology topology40 — Immunoglobulin-like
Homologous superfamily homologous superfamily10 — Immunoglobulins
Domain ID domain_id2icwB01
Class class3 — Alpha Beta
Architecture architecture10 — Roll
Topology topology320 — Class II Histocompatibility Antigen, M Beta Chain; Chain B, domain 1
Homologous superfamily homologous superfamily10 — Class II Histocompatibility Antigen, M Beta Chain; Chain B, domain 1
Domain ID domain_id2icwB02
Class class2 — Mainly Beta
Architecture architecture60 — Sandwich
Topology topology40 — Immunoglobulin-like
Homologous superfamily homologous superfamily10 — Immunoglobulins
Domain ID domain_id2icwD01
Class class3 — Alpha Beta
Architecture architecture10 — Roll
Topology topology320 — Class II Histocompatibility Antigen, M Beta Chain; Chain B, domain 1
Homologous superfamily homologous superfamily10 — Class II Histocompatibility Antigen, M Beta Chain; Chain B, domain 1
Domain ID domain_id2icwD02
Class class2 — Mainly Beta
Architecture architecture60 — Sandwich
Topology topology40 — Immunoglobulin-like
Homologous superfamily homologous superfamily10 — Immunoglobulins
Domain ID domain_id2icwE01
Class class3 — Alpha Beta
Architecture architecture10 — Roll
Topology topology320 — Class II Histocompatibility Antigen, M Beta Chain; Chain B, domain 1
Homologous superfamily homologous superfamily10 — Class II Histocompatibility Antigen, M Beta Chain; Chain B, domain 1
Domain ID domain_id2icwE02
Class class2 — Mainly Beta
Architecture architecture60 — Sandwich
Topology topology40 — Immunoglobulin-like
Homologous superfamily homologous superfamily10 — Immunoglobulins
Domain ID domain_id2icwG01
Class class1 — Mainly Alpha
Architecture architecture20 — Up-down Bundle
Topology topology120 — Four Helix Bundle (Hemerythrin (Met), subunit A)
Homologous superfamily homologous superfamily390 — Hla class ii histocompatibility antigen, dr alpha chain. Chain D, domain 1
Domain ID domain_id2icwG02
Class class1 — Mainly Alpha
Architecture architecture10 — Orthogonal Bundle
Topology topology10 — Arc Repressor Mutant, subunit A
Homologous superfamily homologous superfamily530 — mam-mhc complex, Chain D, Domain 2
Domain ID domain_id2icwH01
Class class1 — Mainly Alpha
Architecture architecture20 — Up-down Bundle
Topology topology120 — Four Helix Bundle (Hemerythrin (Met), subunit A)
Homologous superfamily homologous superfamily390 — Hla class ii histocompatibility antigen, dr alpha chain. Chain D, domain 1
Domain ID domain_id2icwH02
Class class1 — Mainly Alpha
Architecture architecture10 — Orthogonal Bundle
Topology topology10 — Arc Repressor Mutant, subunit A
Homologous superfamily homologous superfamily530 — mam-mhc complex, Chain D, Domain 2
Domain ID domain_id2icwI00
Class class2 — Mainly Beta
Architecture architecture60 — Sandwich
Topology topology40 — Immunoglobulin-like
Homologous superfamily homologous superfamily10 — Immunoglobulins
Domain ID domain_id2icwJ00
Class class2 — Mainly Beta
Architecture architecture60 — Sandwich
Topology topology40 — Immunoglobulin-like
Homologous superfamily homologous superfamily10 — Immunoglobulins
Domain ID domain_id2icwK00
Class class2 — Mainly Beta
Architecture architecture60 — Sandwich
Topology topology40 — Immunoglobulin-like
Homologous superfamily homologous superfamily10 — Immunoglobulins
Domain ID domain_id2icwL00
Class class2 — Mainly Beta
Architecture architecture60 — Sandwich
Topology topology40 — Immunoglobulin-like
Homologous superfamily homologous superfamily10 — Immunoglobulins

8. Citations (1)

9. Files and Curves (10)