NKG2D/CD314 Protein, Human (sf9, His)

The NKG2D/CD314 protein serves as a key activating and costimulatory receptor in immune surveillance, binding to multiple stress-inducing ligands on tumor and virus-infected cells. It plays a dual role by stimulating NK cells and enhancing T cell activation in CD8(+) T cell-mediated adaptive responses. NKG2D/CD314 Protein, Human (sf9, His) is the recombinant human-derived NKG2D/CD314 protein, expressed by Sf9 insect cells , with N-His labeled tag. The total length of NKG2D/CD314 Protein, Human (sf9, His) is 139 a.a., with molecular weight of ~22.6 kDa.

NKG2D/CD314 protein operates as an activating and costimulatory receptor essential for immunosurveillance, binding to diverse cellular stress-inducible ligands presented on autologous tumor cells and virus-infected cells. It plays a dual role in innate immune responses, stimulating both activating killer (NK) cells and acting as a costimulatory receptor for T-cell receptors (TCR) in CD8(+) T-cell-mediated adaptive immune responses, enhancing T-cell activation. The receptor facilitates perforin-mediated elimination of ligand-expressing tumor cells, and its signaling cascades involve calcium influx, ultimately leading to TNF-alpha expression. Additionally, NKG2D/CD314 participates in NK cell-mediated bone marrow graft rejection and may regulate the differentiation and survival of NK cells. Its ligand-binding capacity extends to various subfamilies of MHC class I-related glycoproteins, including MICA, MICB, RAET1E, RAET1G, RAET1L/ULBP6, ULBP1, ULBP2, ULBP3 (ULBP2>ULBP1>ULBP3), and ULBP4. The protein forms homodimers through disulfide linkage and heterohexamers with HCST/DAP10 subunits, a crucial interaction for NK cell surface expression and cytotoxicity induction. Furthermore, it can establish disulfide-bonded heterodimers with CD94 and interacts with CEACAM1, recruiting PTPN6 for VAV1 dephosphorylation, while not interacting with TYROBP.

Immobilized human NKG2D-His (78-216) at 2 μg/mL (100 μL/well) can bind human ULBP1-hFc and the EC₅₀ is 8-50 ng/mL.

Human

Sf9 insect cells

N-His

P26718 (F78-V216)

22914  [NCBI]/100528032  [NCBI]

Approximately 22.6 kDa

Greater than 90% as determined by reducing SDS-PAGE

Lyophilized powder.

Lyophilized from a 0.2 μm filtered solution of 20 mM Tris, 300 mM NaCl, 10% Glycerol, pH 8.0. Normally 5 % - 8 % trehalose, mannitol and 0.01% Tween 80 are added as protectants 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.