Natural HLA class I polymorphism controls the pathway of antigen presentation and susceptibility to viral evasion.

Natural HLA class I polymorphism controls the pathway of antigen presentation and susceptibility to viral evasion.
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DOI:
10.1084/jem.20031680
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发表时间:
2004-07-05
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
McCluskey J
McCluskey J
中科院分区:
其他
文献类型:
--
作者:
Zernich D;Purcell AW;Macdonald WA;Kjer-Nielsen L;Ely LK;Laham N;Crockford T;Mifsud NA;Bharadwaj M;Chang L;Tait BD;Holdsworth R;Brooks AG;Bottomley SP;Beddoe T;Peh CA;Rossjohn J;McCluskey J

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HLA I类多态性产生表位特异性和T细胞库的多样性。我们发现,HLA多态性也控制Ag呈递途径的选择。区分HLA-B *4402(Asp 116)和B*4405(Tyr 116)的单一氨基酸多态性允许B*4405组成性地获得肽,即使在极端肽饥饿的条件下,也没有任何可检测的掺入到与Ag呈递(TAP)相关的转运蛋白相关的肽加载复合物中。这种肽捕获模式比HLA-B*4402使用的常规装载途径更不易受病毒干扰,所述常规装载途径涉及在肽装载复合物内组装I类分子。因此,B*4402和B*4405在HLA I类依赖PLC进行Ag呈递的天然谱中处于相反的极端。这些发现揭示了一个新的层的MHC多态性,影响Ag加载的通用途径,揭示了一个意料之外的进化权衡选择最佳HLA I类加载与有效的病原体逃避。
HLA class I polymorphism creates diversity in epitope specificity and T cell repertoire. We show that HLA polymorphism also controls the choice of Ag presentation pathway. A single amino acid polymorphism that distinguishes HLA-B*4402 (Asp116) from B*4405 (Tyr116) permits B*4405 to constitutively acquire peptides without any detectable incorporation into the transporter associated with Ag presentation (TAP)-associated peptide loading complex even under conditions of extreme peptide starvation. This mode of peptide capture is less susceptible to viral interference than the conventional loading pathway used by HLA-B*4402 that involves assembly of class I molecules within the peptide loading complex. Thus, B*4402 and B*4405 are at opposite extremes of a natural spectrum in HLA class I dependence on the PLC for Ag presentation. These findings unveil a new layer of MHC polymorphism that affects the generic pathway of Ag loading, revealing an unsuspected evolutionary trade-off in selection for optimal HLA class I loading versus effective pathogen evasion.
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