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J. Exp. Med.,
Volume 188, Number 8, October 19, 1998 1511-1520
By



From the * Department of Molecular Medicine, Children's Hospital, Boston, Massachusetts 02115; the Susceptibility to multiple sclerosis is associated with the human histocompatibility leukocyte
antigen (HLA)-DR2 (DRB1*1501) haplotype. The structure of HLA-DR2 was determined
with a bound peptide from human myelin basic protein (MBP) that is immunodominant for
human MBP-specific T cells. Residues of MBP peptide that are important for T cell receptor
recognition are prominent, solvent exposed residues in the crystal structure. A distinguishing
feature of the HLA-DR2 peptide binding site is a large, primarily hydrophobic P4 pocket that
accommodates a phenylalanine of the MBP peptide. The necessary space for this aromatic side
chain is created by an alanine at the polymorphic DR
Department of Molecular and Cellular Biology, Harvard University, Cambridge, Massachusetts
02138; the § Department of Cancer Immunology and AIDS, Dana-Farber Cancer Institute, Boston,
Massachusetts 02115; and the
Department of Neurology, Harvard Medical School, Boston,
Massachusetts 02115
71 position. These features make the P4
pocket of HLA-DR2 distinct from DR molecules associated with other autoimmune diseases.
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