CD3D-CD3E Heterodimer 蛋白, Human (Biotinylated, HEK293, His)

CD3 epsilon is an important component of the TCR-CD3 complex on T lymphocytes and promotes TCR-mediated signaling. When APC activates the TCR, CD3 epsilon, together with CD3D, CD3G, and CD3Z, transmits signals across the cell membrane through ITAMs. CD3E-CD3D Heterodimer Protein, Human (Biotinylated, HEK293, His) is a recombinant protein dimer complex containing human-derived CD3E-CD3D Heterodimer protein, expressed by HEK293 , with C-His labeled tag. CD3E-CD3D Heterodimer Protein, Human (Biotinylated, HEK293, His), has molecular weight of 25-40 kDa.

CD3 epsilon 是 T 淋巴细胞表面 TCR-CD3 复合物的组成部分，在适应性免疫反应中发挥着至关重要的作用。当抗原呈递细胞 (APC) 激活 T 细胞受体 (TCR) 时，CD3 epsilon 与其他 CD3 链（CD3D、CD3G 和 CD3Z）一起促进 TCR 介导的信号跨细胞膜的传输。CD3 epsilon 的胞质结构域中含有基于免疫受体酪氨酸的激活基序 (ITAM)，在 TCR 参与后会被 Src 家族蛋白酪氨酸激酶 LCK 和 FYN 磷酸化，从而激活下游信号通路。除了在信号转导中的作用之外，CD3 epsilon 对于 T 细胞的正常发育也至关重要，它通过形成异二聚体 CD3D/CD3E 和 CD3G/CD3E 来启动 TCR-CD3 复合物的组装。此外，CD3 epsilon 通过其胞质区域中存在的内吞序列参与 TCR-CD3 复合物的内化和细胞表面下调。TCR-CD3复合物包含CD3D/CD3E和CD3G/CD3E异二聚体，其优先与TCRα和TCRβ缔合，形成与CD3Z同二聚体相互作用的三聚体以完成六聚体TCR-CD3复合物。或者，TCRgamma 和TCRdelta 可以替代TCRalpha 和TCRbeta。CD3 epsilon 与 CD6、NCK1 和 NUMB 的相互作用进一步凸显了其在协调 T 细胞激活、发育和内化过程中的关键作用。

Immobilized Biotinylated Human CD3E&CD3D, His Tag at 0.5 μg/ml (100 μl/well) on the streptavidin precoated plate (5 μg/ml). Dose response curve for OKT3, mFc Tag with the EC₅₀ of 12.7 ng/ml determined by ELISA.

Human

HEK293

C-His

P04234 (F22-A105)&P07766 (D23-D126)

915&916

25-40 kDa

Greater than 95% as determined by reducing SDS-PAGE.

无菌粉末.

Lyophilized from a 0.22 μm filtered solution of PBS, pH 7.4. Normally 8% 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 from date of receipt. 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.