活性重组蛋白 Recombinant Human IL-12 / IL-23 p40 Monomer / NKSF / NKSF2 / CLMF p40 / CLMF2 Protein　重组蛋白

研究方向

IL-12β蛋白，又称IL12 p40亚基或IL-12B，与IL-12 p35亚基（IL-12A）异二聚化形成IL-12，与IL23 p19亚基异二聚化形成IL-23，发挥不同的调节作用功能。
IL-12 和 IL23 属于 IL-12 家族，参与促炎反应，由活化的巨噬细胞表达，是 Th1 细胞发育的重要诱导剂。
IL-12 信号通过 p-STAT4 介导的 IL-12Rβ1 和 IL-12Rβ2 传递，而 IL-23 信号通过 p-STAT1 介导的 IL-12Rβ1 和 IL-23R 传递p-STAT3。
人IL-12β蛋白的氨基酸序列与小鼠（69.04%）和大鼠（69.04%）有很大差异。
白细胞介素 12 (IL-12) 家族已知是一种炎症因子，可诱导自身免疫性炎症，因此可能是自身免疫性炎症性疾病的原因，并且可能对肿瘤发生具有重要作用。

生物活性

Measured by its binding ability in a functional ELISA. When Recombinant Human IL‑12 R beta 1 Fc Chimera is immobilized at 1 µg/mL (100 µL/well), the concentration of Recombinant Human IL‑12/IL‑23 p40 Monomer that produces 50% of the optimal binding response is 1-6 ng/mL.

种属

Human

表达宿主

HEK293 cells

Observed MW

50 kDa

标签

C-His

纯度

> 95% by Tris-Bis PAGE;> 95% by SEC-HPLC

内毒素

< 0.1 EU/μg of the protein by LAL method.

制剂

Lyophilized from a 0.22 μm filtered solution of PBS, pH 7.4.

表达区间

23-328 aa

储存

Store at -20℃. Store the lyophilized protein at -20℃ to -80℃ up to 1 year from the date of receipt.
After reconstitution, the protein solution is stable at -20℃ for 3 months, at 2-8℃ for up to 1 week.未开盖的干粉蛋白在 -20°C至-80°C可保存12个月；
复溶之后，蛋白溶液在-20°C及以下可保存3个月，在2-8℃可保存1周。

复溶

Centrifuge the tube before opening. Reconstitute to a concentration of 0.1-0.5 mg/mL in sterile distilled water. Avoid vortex or vigorously pipetting the protein. For long term storage, it is recommended to add a carrier protein or stablizer (e.g. 0.1% BSA, 5% HSA, 10% FBS or 5% Trehalose), and aliquot the reconstituted protein solution to minimize free-thaw cycles.收到重组蛋白产品之后请检查蛋白冻干粉末是否贴于瓶底，如果粉末浮起，开盖之前请先低温离心。将蛋白用说明书中指定的缓冲液复溶至0.1-0.5 mg/mL（请注意蛋白复溶浓度不能低于0.1 mg/mL），室温平衡5-10 min保证充分溶解，复溶过程中请不要剧烈涡旋及吹打蛋白溶液。如需长期储存，建议复溶时添加载体蛋白或者稳定剂（如0.1% BSA, 5% HSA, 10% FBS 或者 5% 海藻糖），同时将复溶后的蛋白溶液按照需求进行分装，储存于-20°C至-80°C，随取随用，避免反复冻融。

背景信息

Interleukin 12, also known as natural killer cell stimulatory factor (NKSF) or cytotoxic lymphocyte maturation factor (CLMF), is a pleiotropic cytokine originally identified in the medium of activated human B lymphoblastoid cell lines. IL-12 is produced by macrophages and B lymphocytes and has multiple effects on T cells and NK cells, including stimulation of cytotoxic activity, proliferation, and promotion of Th1 development as well as IFN-gamma and TNF production. IL-12 is a disulfide-linked, 70 kDa (p70) heterodimeric glycoprotein composed of a 40 kDa (p40) subunit and a 35 kDa (p35) subunit. The p40 and p35 subunits by themselves have no IL-12 activity, the p40 dimer has been shown to bind the IL-12 receptor and to be an IL-12 antagonist. Free p35 has not been detected in supernatant solutions of cultured cells expressing only p35 or both p35 and p40 mRNAs. In contrast, p40 is secreted in excess of IL-12 in cells expressing both p35 and p40 mRNAs. The p40 subunit of IL-12 has been shown to have extensive amino acid sequence homology to the extracellular domain of the human IL-6 receptor while the p35 subunit shows distant but significant sequence similarity to IL-6, G-CSF, and chicken MGF. These observations have led to the suggestion that IL-12 might have evolved from a cytokine/soluble receptor complex. Human and mouse IL-12 share 70% and 60% amino acid sequence homology in their p40 and p35 subunits, respectively. IL-12 apparently shows species specificity with human IL-12 reportedly showing minimal activity in the murine system.

Accession #

P29460

别名

CLMF p40; CLMF; CLMF2; Cytotoxic lymphocyte maturation factor 40 kDa subunit; IL12 p40; IL-12 p40; IL-12 subunit p40; IL12B; IL-12B; IL-12BNK cell stimulatory factor chain 2; interleukin 12, p40; interleukin 12B (natural killer cell stimulatory factor 2, cytotoxic lymphocytematuration factor 2, p40); interleukin-12 beta chain; interleukin-12 subunit beta; natural killer cell stimulatory factor, 40 kD subunit; NKSF; NKSF2; NKSF2IL12, subunit p40