ERAAP and tapasin independently edit the amino and carboxyl termini of MHC class I peptides.

ERAAP and tapasin independently edit the amino and carboxyl termini of MHC class I peptides.
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DOI:
10.4049/jimmunol.1301043
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发表时间:
2013-08-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Shastri N
Shastri N
中科院分区:
其他
文献类型:
--
作者:
Kanaseki T;Lind KC;Escobar H;Nagarajan N;Reyes-Vargas E;Rudd B;Rockwood AL;Van Kaer L;Sato N;Delgado JC;Shastri N

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有效的CD8+ T细胞反应依赖于MHC I分子在细胞表面提供稳定的肽库。MHC I的整体质量是由产生和装载具有适当共识基序的肽到MHC I的机制所决定的。在这里,我们表明肽装载复合物的关键成分tapasin和与抗原加工相关的ER氨基肽酶ERAAP都是肽库不同结构特征的典型编辑器。我们用tapasin或eraap缺陷小鼠的细胞对野生型小鼠进行了互免疫。T细胞反应的特异性分析表明,tapasin或ERAAP的缺失通过导致新的MHC I的丢失或获得而独立改变肽库。MHC结合肽氨基酸序列的变化表明,ERAAP和tapasin分别定义了典型MHC I肽的特征氨基端和羧基端。因此,最佳的pMHC I库是通过内质网中两个不同的肽编辑步骤产生的。
Effective CD8+ T cell responses depend upon presentation of a stable peptide repertoire by MHC I molecules on the cell surface. The overall quality of pMHC I is determined by poorly understood mechanisms that generate and load peptides with appropriate consensus motifs onto MHC I. Here we show that both tapasin, a key component of the peptide loading complex, and ERAAP, the ER aminopeptidase associated with antigen processing, are quintessential editors of distinct structural features of the peptide repertoire. We carried out reciprocal immunization of wild-type mice with cells from tapasin- or ERAAP-deficient mice. Specificity analysis of T cell responses showed that absence of tapasin or ERAAP independently altered the peptide repertoire by causing loss as well as gain of new pMHC I. Changes in amino acid sequences of MHC bound-peptides revealed that ERAAP and tapasin respectively defined the characteristic amino and carboxy termini of canonical MHC I peptides. Thus, the optimal pMHC I repertoire is produced by two distinct peptide editing steps in the ER.
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