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:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Kappler J
Kappler J
中科院分区:
其他
文献类型:
--
作者:
Lu L;Vollmer J;Moulon C;Weltzien HU;Marrack P;Kappler J

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人类Ni2+反应性T细胞的主要组织相容性复合体(MHC)限制元件Ani-2.3被鉴定为DR52c。一系列实验证实,这种T细胞的功能配体是一种预先形成的Ni2+复合体,与DR52c和一种在人和小鼠B细胞中产生的特定多肽结合,而不是在成纤维细胞或其他抗原处理缺陷细胞中产生。此外,Ani-2.3对该复合体的识别依赖于MHCβ链的His81,表明该氨基酸在Ni2+与MHC结合中起作用。我们提出了一个通用的识别Ni2+的模型,在该模型中,βHis81和MHc2-末端的两个氨基酸与Ni2+结合,然后Ni2+与VαCDR1区或CDR2区的某些部分相互作用。
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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