1t20

Structural basis for degenerate recognition of HIV peptide variants by cytotoxic lymphocyte, variant SL9-6I

Method: X-RAY DIFFRACTION Dmax: 76.2 Å Quality: EXCELLENT

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

HLA class I histocompatibility antigen, A-2 alpha chain

Homo sapiens

UniProt P01892

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 25–299 Not recorded Beta-2-microglobulin × 1 (P01884) GAG PEPTIDE × 1 X-RAY DIFFRACTION X-ray crystallization conditions:VAPOR DIFFUSION, HANGING DROP;pH 6.5;293 K;PEG, MES, pH 6.50, VAPOR DIFFUSION, HANGING DROP, temperature 293K Resolution 2.20 Å R-free 0.247

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.

271 other PDB entries and 465 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name 1A02_HUMAN
Isoform
PDB entities 1
Chains and sequence ranges Author chain A; PDBConstruct 1–275; UniProt 25–299

Beta-2-microglobulin

Homo sapiens

UniProt P01884

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 21–119 Not recorded HLA class I histocompatibility antigen, A-2 alpha chain × 1 (P01892) GAG PEPTIDE × 1 X-RAY DIFFRACTION X-ray crystallization conditions:VAPOR DIFFUSION, HANGING DROP;pH 6.5;293 K;PEG, MES, pH 6.50, VAPOR DIFFUSION, HANGING DROP, temperature 293K Resolution 2.20 Å R-free 0.247

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.

27 other PDB entries and 35 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name B2MG_HUMAN
Isoform
PDB entities 2
Chains and sequence ranges Author chain B; PDBConstruct 1–99; UniProt 21–119

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 1t20

P(r) Distance Distribution P(r) Distribution

P(r) distribution for 1t20
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2. Structure Basics 2. Structure Basics

Entry ID entry_id1t20
Deposition date deposition_date2004-04-19
Structure title titleStructural basis for degenerate recognition of HIV peptide variants by cytotoxic lymphocyte, variant SL9-6I
Keywords keywords;CTL, CYTOTOXIC T LYMPHOCYTES, HIV, HUMAN IMMUNODEFICIENCY VIRUS, MHC, MAJOR HISTOCOMPATIBILITY COMPLEX, PMHC, PEPTIDE MHC COMPLEX, RMSD, ROOT-MEAN-SQUARED DEVIATION, SIV, SIMIAN IMMUNODEFICIENCY VIRUS, TCR, T-CELL RECEPTOR, 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_guinier24.37
Radius of gyration Rg (electron density) rg_electron23.17
Forward intensity I(0) i035972400.00
Molecular weight molecular_weight44526.0 kDa
Excluded volume excluded_volume54920 ų
Envelope volume envelope_volume67978 ų
Hydration-shell volume shell_volume24618 ų
Envelope diameter envelope_diameter79.2
Shell Rg shell_rg29.91
Envelope Rg envelope_rg23.26
Shape Rg shape_rg23.14
Total Rg total_rg24.03
Total atoms total_atoms3146
Residues n_residues383
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 dmax76.2
Rg (real space) rg_real24.30
Rg uncertainty (real space) rg_real_error0.50
I(0) (real space) i0_real3.5970e+07
I(0) uncertainty (real space) i0_real_error5.0220e+05
Rg (reciprocal space) rg_reciprocal24.32
I(0) (reciprocal space) i0_reciprocal35970000.0000
Solution quality estimate total_estimate0.9103
Solution quality rating solution_quality EXCELLENT a EXCELLENT solution
P(r) peaks n_peaks2
Primary peak position r_peak_primary30.2
Skewness Skewness skewness0.251
Kurtosis Kurtosis kurtosis-0.469
Angular range angular_range— – 0.3250 −1
Current regularization parameter α current_alpha0.0000
Highest regularization parameter α highest_alpha8846000.0000
Real-space data points n_real_points64
GNOM version gnom_version4.1.3
Quality Criteria quality_criteria AN1: 0.000; Oscil: 0.948; Stabil: 1.000; Sysdev: 1.000; Positv: 1.000; Valcen: 0.996; Smooth: 0.988

5. Crystallography and Experiment 5. Crystallography & Experiment

6. Entities and Polymers Entities & Polymers (4)

7. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (3 domains)

Domain ID domain_idd1t20a1
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_idd1t20a2
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_idd1t20b_
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)

CATH v4.4 (3 domains)

Domain ID domain_id1t20A01
Class class3 — Alpha Beta
Architecture architecture30 — 2-Layer Sandwich
Topology topology500 — Murine Class I Major Histocompatibility Complex, H2-DB; Chain A, domain 1
Homologous superfamily homologous superfamily10 — MHC class I-like antigen recognition-like
Domain ID domain_id1t20A02
Class class2 — Mainly Beta
Architecture architecture60 — Sandwich
Topology topology40 — Immunoglobulin-like
Homologous superfamily homologous superfamily10 — Immunoglobulins
Domain ID domain_id1t20B00
Class class2 — Mainly Beta
Architecture architecture60 — Sandwich
Topology topology40 — Immunoglobulin-like
Homologous superfamily homologous superfamily10 — Immunoglobulins

8. Citations (1)

9. Files and Curves (10)