Lysophospholipid presentation by CD1d and recognition by a human Natural Killer T-cell receptor

Lysophospholipid presentation by CD1d and recognition by a human Natural Killer T-cell receptor
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DOI:
10.1038/emboj.2012.54
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发表时间:
2012-04-18
期刊:
影响因子:
11.4
通讯作者:
Adams, Erin J.
Adams, Erin J.
中科院分区:
生物学1区
文献类型:
--
作者:
Lopez-Sagaseta, Jacinto;Sibener, Leah V.;Adams, Erin J.

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不变自然杀伤 T (iNKT) 细胞使用高度限制的 αβ T 细胞受体 (TCR) 来探测 CD1d 分子呈递的脂质库。在这里,我们描述了我们对人类 CD1d 呈递溶血磷脂酰胆碱 (LPC) 及其被天然 LPC 特异性 iNKT TCR 识别的研究。呈递 LPC 的人 CD1d 采用与呈递糖脂抗原的 CD1d 不同的构象,其中 α 1 螺旋发生变化,导致开放的 A' 口袋。 iNKT TCR 的结合需要 LPC 头基位移 7 埃,但可以将 CD1d-LPC 复合物稳定在闭合构象中。 CD1d-LPC 上的 iNKT TCR CDR 环足迹由 CDR3 α 环的保守定位锚定,而其余 CDR 环则发生移动,部分原因是该 iNKT TCR 使用的 CDR3 β 和 J β 片段中的氨基酸差异。这些发现提供了关于溶血磷脂如何由人类 CD1d 分子呈递以及该复合物如何被一些(但不是全部)人类 iNKT 细胞识别的见解。 EMBO 杂志 (2012) 31, 2047-2059。 doi:10.1038/emboj.2012.54;在线发表 2012 年 3 月 6 日 主题类别:免疫学
Invariant Natural Killer T (iNKT) cells use highly restricted alpha beta Tcell receptors (TCRs) to probe the repertoire of lipids presented by CD1d molecules. Here, we describe our studies of lysophosphatidylcholine (LPC) presentation by human CD1d and its recognition by a native, LPC-specific iNKT TCR. Human CD1d presenting LPC adopts an altered conformation from that of CD1d presenting glycolipid antigens, with a shifted alpha 1 helix resulting in an open A' pocket. Binding of the iNKT TCR requires a 7-angstrom displacement of the LPC headgroup but stabilizes the CD1d-LPC complex in a closed conformation. The iNKT TCR CDR loop footprint on CD1d-LPC is anchored by the conserved positioning of the CDR3 alpha loop, whereas the remaining CDR loops are shifted, due in part to amino-acid differences in the CDR3 beta and J beta segment used by this iNKT TCR. These findings provide insight into how lysophospholipids are presented by human CD1d molecules and how this complex is recognized by some, but not all, human iNKT cells. The EMBO Journal (2012) 31, 2047-2059. doi:10.1038/emboj.2012.54; Published online 6 March 2012 Subject Categories: immunology