Structure of natural killer cell receptor KLRG1 bound to E-cadherin reveals basis for MHC-independent missing self recognition.

Structure of natural killer cell receptor KLRG1 bound to E-cadherin reveals basis for MHC-independent missing self recognition.
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DOI:
10.1016/j.immuni.2009.04.019
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发表时间:
2009-07-17
期刊:
影响因子:
32.4
通讯作者:
Mariuzza, Roy A.
Mariuzza, Roy A.
中科院分区:
医学1区
文献类型:
--
作者:
Li, Yili;Hofmann, Maike;Wang, Qian;Teng, Leslie;Chlewicki, Lukasz K.;Pircher, Hanspeter;Mariuzza, Roy A.

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自然杀伤 (NK) 细胞的溶细胞活性由抑制性受体调节,这些受体检测靶细胞上是否存在自身分子。自我识别缺失的结构研究主要集中在结合 MHC 的 NK 受体上。然而,NK 细胞还具有非 MHC 配体特异性的抑制性受体,特别是钙粘蛋白,其在转移性肿瘤中表达下调。我们确定了杀伤细胞凝集素样受体 G1 (KLRG1) 与 E-钙粘蛋白复合物的结构。 KLRG1 通过与经典钙粘蛋白上高度保守的位点结合来介导自我识别缺失,使其能够监测靶细胞上几种钙粘蛋白(E-、N- 和 R-)的表达。该位点与负责细胞间粘附的位点重叠,但与整合素 αEβ7 结合位点不同。我们提出,E-钙粘蛋白可能共同参与 KLRG1 和 αEβ7,并且 KLRG1 通过与靶细胞的多点附着来克服其对钙粘蛋白异常弱的亲和力,从而产生抑制信号传导。
The cytolytic activity of natural killer (NK) cells is regulated by inhibitory receptors that detect the absence of self molecules on target cells. Structural studies of missing self recognition have focused on NK receptors that bind MHC. However, NK cells also possess inhibitory receptors specific for non-MHC ligands, notably cadherins, which are down-regulated in metastatic tumors. We determined the structure of killer cell lectin-like receptor G1 (KLRG1) in complex with E-cadherin. KLRG1 mediates missing self recognition by binding to a highly conserved site on classical cadherins, enabling it to monitor expression of several cadherins (E-, N- and R-) on target cells. This site overlaps the site responsible for cell–cell adhesion, but is distinct from the integrin αEβ7 binding site. We propose that E-cadherin may co-engage KLRG1 and αEβ7, and that KLRG1 overcomes its exceptionally weak affinity for cadherins through multipoint attachment to target cells, resulting in inhibitory signaling.
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