Components of the ligand for a Ni++ reactive human T cell clone.
Components of the ligand for a Ni++ reactive human T cell clone.
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DOI:
10.1084/jem.20021762
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发表时间:
2003-03-03
期刊:
影响因子:
--
通讯作者:
Kappler J
中科院分区:
文献类型:
--
作者:
Lu L;Vollmer J;Moulon C;Weltzien HU;Marrack P;Kappler J
The major histocompatibility complex (MHC) restriction element for a human Ni2+ reactive T cell, ANi-2.3, was identified as DR52c. A series of experiments established that the functional ligand for this T cell was a preformed complex of Ni2+ bound to the combination of DR52c and a specific peptide that was generated in human and mouse B cells, but not in fibroblasts nor other antigen processing–deficient cells. In addition, ANi-2.3 recognition of this complex was dependent on His81 of the MHC β chain, suggesting a role for this amino acid in Ni2+ binding to MHC. We propose a general model for Ni2+ recognition in which βHis81 and two amino acids from the NH2-terminal part of the MHC bound peptide coordinate Ni2+ which then interacts with some portion of the Vα CDR1 or CDR2 region.
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