HLA-G Complex Tetramer 蛋白, Human (Biotinylated, HEK293, His-Avi)

HLA-G, a non-classical major histocompatibility class Ib molecule, crucially regulates immunity at the maternal-fetal interface. Partnered with B2M, it forms a complex selectively binding self-peptides, fostering maternal-fetal tolerance through interactions with KIR2DL4, LILRB1, and LILRB2 receptors. Engagement triggers NK cell senescence, induces regulatory T cell differentiation, and balances tolerance and antiviral immunity. HLA-G actively contributes to immune modulation at the maternal-fetal interface, showcasing its multifaceted role in promoting fetal development while maintaining immune balance. HLA-G Complex Tetramer Protein, Human (Biotinylated, HEK293, His-Avi) is a recombinant protein dimer complex containing HLA-G Protein and B2M/Beta-2-microglobulin Protein, expressed by HEK293 , with C-Avi, C-His labeled tag and RIIPRHLQL peptide. HLA-G Complex Tetramer Protein, Human (Biotinylated, HEK293, His-Avi), has molecular weight of 260-265 kDa.

HLA-G 是一种非经典主要组织相容性 Ib 类分子，在母胎界面的免疫调节中发挥着至关重要的作用。它与 B2M/beta-2 微球蛋白结合，形成一种复合物，选择性结合源自细胞内蛋白（包括组蛋白和核糖体蛋白）的有限九聚体自肽。这种肽结合的 HLA-G-B2M 复合物充当抑制/激活子宫免疫细胞上的 KIR2DL4、LILRB1 和 LILRB2 受体的配体，促进胎儿发育，同时维持母胎耐受性。与 KIR2DL4 和 LILRB1 受体的相互作用触发 NK 细胞衰老相关的分泌表型，促进妊娠早期血管重塑和胎儿生长。此外，HLA-G 与 LILRB2 的结合诱导 1 型调节性 T 细胞和骨髓源性抑制细胞的分化，积极促进母胎耐受性的维持。此外，HLA-G 可能通过调节 NK 细胞、CD8+ T 细胞和 B 细胞的效应功能，在平衡耐受性和抗病毒免疫方面发挥作用。此外，它还能负调节 NK 细胞和 CD8+ T 细胞介导的细胞毒性，凸显其在母胎界面免疫调节中的多方面作用。

1. Human LILRB2 captured on CM5 Chip via Protein A can bind Biotinylated Human HLA-G Complex Tetramer with an affinity constant of 4.38 nM as determined in SPR assay (Biacore T200).
2. Serial dilutions of Anti-LILRB2 Antibody were added into Biotinylated HLA-G Complex Tetramer, His Tag: Human LILRB2, mFc Tag binding reactioins. The half maximal inhibitiory concentration (IC₅₀) is 0.3 μg/mL.

Human

HEK293

C-Avi;C-His

P17693 (G25-T305)&P61769 (I21-M119)&RIIPRHLQL

3135  [NCBI]&567  [NCBI]

260-265 kDa

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

无菌粉末.

Lyophilized from a 0.22 μm filtered solution of PBS, pH 7.4. Normally 5% trehalose is added as protectant before lyophilization.

<1 EU/μg, determined by LAL method.

It is not recommended to reconstitute to a concentration less than 100 μg/mL in ddH₂O.

Stored at -20°C for 2 years. After reconstitution, it is stable at 4°C for 1 week or -20°C for longer (with carrier protein). It is recommended to freeze aliquots at -20°C or -80°C for extended storage.

Room temperature in continental US; may vary elsewhere.