Molecular mechanism of lipopeptide presentation by CD1a.

Molecular mechanism of lipopeptide presentation by CD1a.
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CD1a 呈递脂肽的分子机制。

DOI:
10.1016/j.immuni.2004.12.009
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发表时间:
2005
期刊:
Immunity.
影响因子:
--
通讯作者:
Wilson,IanA
Wilson,IanA
中科院分区:
--
文献类型:
--
作者:
Zajonc,DirkM;Crispin,MDMax;Bowden,ThomasA;Young,DavidC;Cheng,Tan-Yun;Hu,Jingdan;Costello,CatherineE;Rudd,PaulineM;Dwek,RaymondA;Miller,MarvinJ;Brenner,MichaelB;Moody,DBranch;Wilson,IanA

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CD1a 在朗格汉斯细胞 (LC) 和树突状细胞 (DC) 上表达,介导 T 细胞识别含有一个或两个烷基链的糖脂和脂肽抗原。我们在此证明 CD1a 限制性 T 细胞可以区分双脱羟基分枝杆菌素脂肽的肽成分。以 2.8 Å 分辨率对 CD1a 与合成分枝杆菌素脂肽共结晶进行的结构分析进一步表明,单烷基链深深插入凹槽的 A' 口袋内,而其两个肽分支沿着 F' 口袋突出到 CD1a 的外部 α 螺旋表面,以便被 TCR 识别。值得注意的是,肽部分的环化赖氨酸分支位于浅 F' 袋中,其构象与 CD1a-硫苷脂结构中的烷基链的构象非常相似。因此,该结构研究说明了 CD1 如何呈递单链脂质以及脂肽的肽部分如何被 TCR 识别。
CD1a is expressed on Langerhans cells (LCs) and dendritic cells (DCs), where it mediates T cell recognition of glycolipid and lipopeptide antigens that contain either one or two alkyl chains. We demonstrate here that CD1a-restricted T cells can discriminate the peptide component of didehydroxymycobactin lipopeptides. Structure analysis of CD1a cocrystallized with a synthetic mycobactin lipopeptide at 2.8 Å resolution further reveals that the single alkyl chain is inserted deep within the A′ pocket of the groove, whereas its two peptidic branches protrude along the F′ pocket to the outer, α-helical surface of CD1a for recognition by the TCR. Remarkably, the cyclized lysine branch of the peptide moiety lies in the shallow F′ pocket in a conformation that closely mimics that of the alkyl chain in the CD1a-sulfatide structure. Thus, this structural study illustrates how a single chain lipid can be presented by CD1 and that the peptide moiety of the lipopeptide is recognized by the TCR.
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