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RCSB PDB - 1A1O: MHC CLASS I MOLECULE B*5301 COMPLEXED WITH PEPTIDE LS6 (KPIVQYDNF) FROM THE MALARIA PARASITE P. FALCIPARUM

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Bound water structure and polymorphic amino acids act together to allow the binding of different peptides to MHC class I HLA-B53.

Smith, K.J.Reid, S.W.Harlos, K.McMichael, A.J.Stuart, D.I.Bell, J.I.Jones, E.Y.

(1996) Immunity 4: 215-228

  • PubMed8624812 Search on PubMed
  • DOI: https://doi.org/10.1016/s1074-7613(00)80430-6

  • PubMed Abstract: 

    The structure of the human MHC class I molecule HLA-B53 complexed to two nonameric peptide epitopes (from the malaria parasite P. falciparum and the HIV2 gag protein) has been determined by X-ray crystallography at 2.3 angstrom resolution. The structures reveal the architecture of a Pro-specific B pocket common to many HLA-B alleles. Relative to other alleles, the B53 peptide-binding groove is widened by a significant (up to 1.25 angstrom) shift in the position of the alpha 1 helix. Within this groove, bound water molecules, acting in concert with the side chains of polymorphic residues, provide the functional malleability of the MHC, which enables the high affinity/low specificity binding of multiple peptide epitopes.


  • Organizational Affiliation

    Nuffield Department of Clinical Medicine, Institute of Molecular Medicine, John Radcliffe Hospital, Oxford, United Kingdom.