IL-2 蛋白, Human (His)

IL-2 protein is mainly produced by activated CD4-positive helper T cells and plays an important role in immune response and tolerance. Binding to IL-2R induces downstream signaling through JAK1 and JAK3 phosphorylation, thereby activating various pathways, including STAT, PI3K, and MAPK. IL-2 Protein, Human (His) is the recombinant human-derived IL-2 protein, expressed by E. coli , with N-6*His labeled tag. The total length of IL-2 Protein, Human (His) is 133 a.a., with molecular weight of ~16 kDa.

细胞因子白细胞介素 2 (IL-2) 主要由活化的 CD4 阳性辅助 T 细胞产生，在较小程度上由活化的 CD8 阳性 T 细胞和自然杀伤 (NK) 细胞产生，在免疫反应和耐受性。IL-2 与由高亲和力三聚体 IL-2R（IL2RA/CD25、IL2RB/CD122 和 IL2RG/CD132）或低亲和力二聚体 IL-2R（IL2RB 和 IL2RG）组成的受体复合物结合。这种相互作用诱导 IL-2R 亚基的寡聚化和构象变化，通过 JAK1 和 JAK3 的磷酸化启动下游信号传导。随后，JAK1 和 JAK3 磷酸化受体，为各种底物（包括 STAT5）的磷酸化创建对接位点。该过程激活多种途径，包括 STAT、磷酸肌醇 3-激酶/PI3K 和丝裂原激活蛋白激酶/MAPK 途径。IL-2 作为 T 细胞生长因子发挥作用，增强 NK 细胞的溶细胞活性，并促进活化 B 细胞的强劲增殖，从而增加免疫球蛋白的产生。此外，IL-2 通过控制调节性 T 细胞的存活和增殖，在调节适应性免疫系统中发挥着至关重要的作用，这对于维持免疫耐受至关重要。此外，IL-2 参与各种效应 T 细胞亚群的分化和稳态，包括 Th1、Th2、Th17 以及记忆 CD8 阳性 T 细胞。

Measured in a cell proliferation assay using CTLL-2 mouse cytotoxic T cells. The ED₅₀ for this effect is 0.1764 ng/mL, corresponding to a specific activity is 5.669×10⁶ units/mg.

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  Measured in a cell proliferation assay using CTLL-2 mouse cytotoxic T cells. The ED₅₀ for this effect is 0.1764 ng/mL, corresponding to a specific activity is 5.669×10⁶ units/mg.

Human

E. coli

N-6*His

P60568 (A21-T153)

3558  [NCBI]

APTSSSTKKTQLQLEHLLLDLQMILNGINNYKNPKLTRMLTFKFYMPKKATELKHLQCLEEELKPLEEVLNLAQSKNFHLRPRDLISNINVIVLELKGSETTFMCEYADETATIVEFLNRWITFCQSIISTLT

Approximately 16 kDa

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

无菌粉末.

Lyophilized from a 0.2 μm filtered solution of PBS, 300 mM NaCl, pH 7.4.

<1 EU/μg, determined by LAL method.

It is not recommended to reconstitute to a concentration less than 100 μg/mL in ddH₂O. For long term storage it is recommended to add a carrier protein (0.1% BSA, 5% HSA, 10% FBS or 5% Trehalose).

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.