1HLA

STRUCTURE OF THE HUMAN CLASS I HISTOCOMPATIBILITY ANTIGEN, HLA-A2

• PDB DOI: https://doi.org/10.2210/pdb1HLA/pdb

• Classification: HISTOCOMPATIBILITY ANTIGEN
• Organism(s): Homo sapiens
• Mutation(s): No 


• Deposited: 1987-10-15 Released: 1988-01-16 
• Deposition Author(s): Bjorkman, P.J., Saper, M.A., Samraoui, B., Bennett, W.S., Strominger, J.L., Wiley, D.C.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.50 Å

Literature

Structure of the human class I histocompatibility antigen, HLA-A2.

Bjorkman, P.J., Saper, M.A., Samraoui, B., Bennett, W.S., Strominger, J.L., Wiley, D.C.

(1987) Nature 329: 506-512

• PubMed: 3309677 
• DOI: https://doi.org/10.1038/329506a0
• Primary Citation of Related Structures:  
  1HLA


• PubMed Abstract: 
  

  The class I histocompatibility antigen from human cell membranes has two structural motifs: the membrane-proximal end of the glycoprotein contains two domains with immunoglobulin-folds that are paired in a novel manner, and the region distal from the membrane is a platform of eight antiparallel beta-strands topped by alpha-helices. A large groove between the alpha-helices provides a binding site for processed foreign antigens. An unknown 'antigen' is found in this site in crystals of purified HLA-A2.

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Organizational Affiliation: 

Department of Biochemistry and Molecular Biology, Harvard University, Cambridge, Massachusetts 02138.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 42.67 kDa 
• Atom Count: 367 
• Modelled Residue Count: 367 
• Deposited Residue Count: 367 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CLASS I HISTOCOMPATIBILITY ANTIGEN (HLA-A2) (ALPHA CHAIN)	A	270	Homo sapiens	Mutation(s): 0
UniProt & NIH Common Fund Data Resources
Find proteins for P04439 (Homo sapiens) Explore P04439  Go to UniProtKB:  P04439
PHAROS:  P04439 GTEx:  ENSG00000206503

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
BETA 2-MICROGLOBULIN	B [auth M]	97	Homo sapiens	Mutation(s): 0
UniProt & NIH Common Fund Data Resources
Find proteins for P61769 (Homo sapiens) Explore P61769  Go to UniProtKB:  P61769
PHAROS:  P61769 GTEx:  ENSG00000166710

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.50 Å
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 60.2	α = 90
b = 80.4	β = 90
c = 112.2	γ = 90

Structure Validation

Entry History 

Deposition Data

• Released Date: 1988-01-16 
Deposition Author(s): Bjorkman, P.J., Saper, M.A., Samraoui, B., Bennett, W.S., Strominger, J.L., Wiley, D.C.

Revision History  

• Version 1.0: 1988-01-16
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2024-02-07
  Changes: Data collection, Database references, Other