1a6a

THE STRUCTURE OF AN INTERMEDIATE IN CLASS II MHC MATURATION: CLIP BOUND TO HLA-DR3

Method: X-RAY DIFFRACTION Dmax: 84.3 Å Quality: GOOD

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

HLA class II histocompatibility antigen, DR alpha chain

OrganismNot specified

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 × 3 PDB declaration: trimeric(3) Consistent with protein copy count Chain A; UniProt 30–205 Not recorded HLA class II histocompatibility antigen, DR-1 beta chain × 1 (P01912) HLA class II histocompatibility antigen, gamma chain × 1 (P04233) NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 X-RAY DIFFRACTION X-ray crystallization conditions:pH 4.5;12% PEG 4K, 100 MM MGCL2, 100 MM ACETATE BUFFER, PH 4.5 Resolution 2.75 Å R-free 0.325
2 Protein heterocomplex Heteromer Protein × 6 PDB declaration: hexameric(6) Consistent with protein copy count Chain A; UniProt 30–205 Not recorded HLA class II histocompatibility antigen, DR-1 beta chain × 2 (P01912) HLA class II histocompatibility antigen, gamma chain × 2 (P04233) NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 X-RAY DIFFRACTION X-ray crystallization conditions:pH 4.5;12% PEG 4K, 100 MM MGCL2, 100 MM ACETATE BUFFER, PH 4.5 Resolution 2.75 Å R-free 0.325

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 1–176; UniProt 30–205

HLA class II histocompatibility antigen, DR-1 beta chain

OrganismNot specified

UniProt P01912

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 × 3 PDB declaration: trimeric(3) Consistent with protein copy count Chain B; UniProt 34–220 Not recorded HLA class II histocompatibility antigen, DR alpha chain × 1 (P01903) HLA class II histocompatibility antigen, gamma chain × 1 (P04233) NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 X-RAY DIFFRACTION X-ray crystallization conditions:pH 4.5;12% PEG 4K, 100 MM MGCL2, 100 MM ACETATE BUFFER, PH 4.5 Resolution 2.75 Å R-free 0.325
2 Protein heterocomplex Heteromer Protein × 6 PDB declaration: hexameric(6) Consistent with protein copy count Chain B; UniProt 34–220 Not recorded HLA class II histocompatibility antigen, DR alpha chain × 2 (P01903) HLA class II histocompatibility antigen, gamma chain × 2 (P04233) NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 X-RAY DIFFRACTION X-ray crystallization conditions:pH 4.5;12% PEG 4K, 100 MM MGCL2, 100 MM ACETATE BUFFER, PH 4.5 Resolution 2.75 Å R-free 0.325

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.

No other PDB entry for the same UniProt protein was found.

View Construct and Data Evidence
UniProt name HB2B_HUMAN
Isoform
PDB entities 2
Chains and sequence ranges Author chain B; PDBConstruct 1–187; UniProt 34–220

HLA class II histocompatibility antigen, gamma chain

OrganismNot specified

UniProt P04233

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 × 3 PDB declaration: trimeric(3) Consistent with protein copy count Chain C; UniProt 103–117 Fragment:CLIP FRAGMENT 87 - 101 OF INVARIANT CHAIN HLA class II histocompatibility antigen, DR alpha chain × 1 (P01903) HLA class II histocompatibility antigen, DR-1 beta chain × 1 (P01912) NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 X-RAY DIFFRACTION X-ray crystallization conditions:pH 4.5;12% PEG 4K, 100 MM MGCL2, 100 MM ACETATE BUFFER, PH 4.5 Resolution 2.75 Å R-free 0.325
2 Protein heterocomplex Heteromer Protein × 6 PDB declaration: hexameric(6) Consistent with protein copy count Chain C; UniProt 103–117 Fragment:CLIP FRAGMENT 87 - 101 OF INVARIANT CHAIN HLA class II histocompatibility antigen, DR alpha chain × 2 (P01903) HLA class II histocompatibility antigen, DR-1 beta chain × 2 (P01912) NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 X-RAY DIFFRACTION X-ray crystallization conditions:pH 4.5;12% PEG 4K, 100 MM MGCL2, 100 MM ACETATE BUFFER, PH 4.5 Resolution 2.75 Å R-free 0.325

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.

17 other PDB entries and 23 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name HG2A_HUMAN
Isoform
PDB entities 3
Chains and sequence ranges Author chain C; PDBConstruct 1–15; UniProt 103–117

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 1a6a

P(r) Distance Distribution P(r) Distribution

P(r) distribution for 1a6a
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2. Structure Basics 2. Structure Basics

Entry ID entry_id1a6a
Deposition date deposition_date1998-02-22
Structure title titleTHE STRUCTURE OF AN INTERMEDIATE IN CLASS II MHC MATURATION: CLIP BOUND TO HLA-DR3
Keywords keywordsMHC GLYCOPROTEIN, COMPLEX (TRANSMEMBRANE-GLYCOPROTEIN), COMPLEX (TRANSMEMBRANE-GLYCOPROTEIN) complex; COMPLEX (TRANSMEMBRANE/GLYCOPROTEIN)
Experimental Method methodX-RAY DIFFRACTION

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

Radius of gyration Rg (Guinier) rg_guinier24.79
Radius of gyration Rg (electron density) rg_electron23.92
Forward intensity I(0) i033075800.00
Molecular weight molecular_weight44372.0 kDa
Excluded volume excluded_volume55420 ų
Envelope volume envelope_volume65798 ų
Hydration-shell volume shell_volume23514 ų
Envelope diameter envelope_diameter84.6
Shell Rg shell_rg30.42
Envelope Rg envelope_rg24.20
Shape Rg shape_rg23.89
Total Rg total_rg24.78
Total atoms total_atoms3136
Residues n_residues378
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 dmax84.3
Rg (real space) rg_real24.85
Rg uncertainty (real space) rg_real_error0.71
I(0) (real space) i0_real3.3080e+07
I(0) uncertainty (real space) i0_real_error4.8090e+05
Rg (reciprocal space) rg_reciprocal24.84
I(0) (reciprocal space) i0_reciprocal33080000.0000
Solution quality estimate total_estimate0.8758
Solution quality rating solution_quality GOOD a GOOD solution
P(r) peaks n_peaks2
Primary peak position r_peak_primary28.1
Skewness Skewness skewness0.384
Kurtosis Kurtosis kurtosis-0.358
Angular range angular_range— – 0.3200 −1
Current regularization parameter α current_alpha0.0000
Highest regularization parameter α highest_alpha6937000.0000
Real-space data points n_real_points64
GNOM version gnom_version4.1.3
Quality Criteria quality_criteria AN1: 0.000; Oscil: 0.850; Stabil: 1.000; Sysdev: 1.000; Positv: 1.000; Valcen: 0.895; Smooth: 0.938

5. Crystallography and Experiment 5. Crystallography & Experiment

6. Entities and Polymers Entities & Polymers (5)

7. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

Domain ID domain_idd1a6aa1
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_idd1a6aa2
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_idd1a6ab1
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_idd1a6ab2
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

CATH v4.4 (4 domains)

Domain ID domain_id1a6aA01
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_id1a6aA02
Class class2 — Mainly Beta
Architecture architecture60 — Sandwich
Topology topology40 — Immunoglobulin-like
Homologous superfamily homologous superfamily10 — Immunoglobulins
Domain ID domain_id1a6aB01
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_id1a6aB02
Class class2 — Mainly Beta
Architecture architecture60 — Sandwich
Topology topology40 — Immunoglobulin-like
Homologous superfamily homologous superfamily10 — Immunoglobulins

8. Citations (1)

9. Files and Curves (10)