NKG2A-CD94 Heterodimer 蛋白, Human (HEK293, Fc-Flag)

NKG2A Protein, a crucial immune inhibitory receptor, forms a complex with KLRD1 on lymphocyte subsets for self-nonself discrimination. Recognizing HLA-E loaded with self-peptides, it monitors MHC class I expression in healthy cells, promoting self-tolerance. NKG2A transmits signals through ITIMs, recruiting tyrosine phosphatases to counteractivate receptors. As a key inhibitor on NK cells, it regulates their functions, distinguishing harmless from pathogenic antigens. In the tumor microenvironment, NKG2A acts as an immune inhibitory checkpoint, contributing to cell exhaustion. During viral infection, it inhibits NK cell cytotoxicity, facilitating viral immune escape. NKG2A-CD94 Heterodimer Protein, Human (HEK293, Fc-Flag) is a recombinant protein dimer complex containing human-derived NKG2A-CD94 Heterodimer protein, expressed by HEK293, with N-hFc, N-Flag labeled tag. NKG2A-CD94 Heterodimer Protein, Human (HEK293, Fc-Flag), has molecular weight of 55-65 kDa.

NKG2A 蛋白是一种对自我-非自我辨别至关重要的免疫抑制受体，与细胞毒性和调节性淋巴细胞亚群上的 KLRD1 形成复合物，识别装载有来自信号的自身肽的非经典主要组织相容性 (MHC) Ib 类分子 HLA-E经典 MHC Ia 类分子的序列。这种识别使细胞毒性细胞能够监测健康细胞中 MHC I 类的表达并促进自我耐受。与 HLA-E 肽复合物结合后，NKG2A 通过两个基于免疫受体酪氨酸的抑制基序 (ITIM) 传递细胞内信号，招募 INPP5D/SHP-1 和 INPPL1/SHP-2 酪氨酸磷酸酶来对抗来自激活受体的信号。作为自然杀伤 (NK) 细胞的关键抑制性受体，NKG2A 调节其激活和效应功能，对抗记忆/效应 CD8 阳性 T 细胞子集上的 T 细胞受体信号传导，并将无害抗原与致病抗原区分开来。在富含 HLA-E 的肿瘤微环境中，NKG2A 充当免疫抑制检查点，导致 NK 细胞和肿瘤特异性 T 细胞效应功能逐渐丧失，这种现象称为细胞衰竭。值得注意的是，在病毒感染期间，NKG2A 识别与人巨细胞病毒衍生肽复合的 HLA-E，抑制 NK 细胞的细胞毒性并促进病毒免疫逃逸。

Human

HEK293

N-hFc;N-Flag

P26715 (R100-L233)&Q13241 (S34-I179)

3821  [NCBI]&3824  [NCBI]

55-65 kDa

Greater than 95% as determined by Tris-Bis PAGE.

<1 EU/μg, determined by LAL method.