An old Twist in HLA-A: CDR3α Hook up at an R65-joint.

An old Twist in HLA-A: CDR3α Hook up at an R65-joint.
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DOI:
10.3389/fimmu.2015.00268
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发表时间:
2015
影响因子:
7.3
通讯作者:
Murray JS
Murray JS
中科院分区:
医学2区
文献类型:
--
作者:
Murray JS

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T细胞个体发育优化了主要组织相容性复合体(α/β)I/II类基因多态识别的T细胞受体(TcR)谱系,TcR生殖系V基因片段和MHC的共同进化必然导致在第三互补决定区域(CDR3α/β)产生的体细胞多样性;然而,目前还不清楚是如何产生的。在这篇文章中,描述了几个不同TCR[都在同一个MHC分子(HLAA2)的复合体中]使用的V-Jα与一个保守的MHC基序(A.A.,R65-X-X-K-A-X-S-Q72)之间的明显结构联系。我们对这个R65-关节进行了详细的建模,并表明同一个TCR的CDR3α环与多态氨基酸(A.A.)的CDR2α环保持在~4 ä的距离。α-2螺旋在所有被分析的晶体结构中的位置,除了一个。事实上,对接的TCR的音调随着它们的扭曲/倾斜/摇摆保持R65-关节和多肽接触而变化。因此,R65关节似乎已经使人类白细胞抗原-A谱系趋于同种异体反应。
T-cell ontogeny optimizes the α/β T-cell receptor (TCR) repertoire for recognition of major histocompatibility complex (MHC) class-I/II genetic polymorphism, and co-evolution of TCR germline V-gene segments and the MHC must entail somatic diversity generated in the third complimentary determining regions (CDR3α/β); however, it is still not clear how. Herein, a conspicuous structural link between the V-Jα used by several different TCR [all in complex with the same MHC molecule (HLA-A2)], and a conserved MHC motif (a.a., R65-X-X-K-A-X-S-Q72) is described. We model this R65-joint in detail, and show that the same TCR’s CDR3α loop maintains its CDR2α loop at a distance of ~4 Å from polymorphic amino acid (a.a.) positions of the α-2 helix in all but one of the analyzed crystal structures. Indeed, the pitch of docked TCRs varies as their twist/tilt/sway maintains the R65-joint and peptide contacts. Thus, the R65-joint appears to have poised the HLA-A lineage toward alloreactivity.
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