活性重组蛋白 Recombinant Human IGFBP3 / BP-53 / IBP3 Protein　重组蛋白

研究方向

IGFBP-3 蛋白是胰岛素样生长因子结合蛋白 (IGFBP) 的成员，在延长胰岛素样生长因子 (IGF) 的半衰期和调节其对细胞培养的生长促进作用方面发挥着至关重要的作用。IGFBP-3 具有抑制或刺激 IGF 诱导的细胞反应的能力，通过改变 IGF 与其各自的细胞表面受体之间的相互作用动力学来发挥其调节影响。此外，IGFBP-3 还表现出由其受体 TMEM219/IGFBP-3R 介导的不依赖于 IGF 的抗增殖和凋亡作用。此外，IGFBP-3 抑制护脑素对胰岛素敏感性的积极作用并促进睾丸生殖细胞凋亡。与 XLKD1 的相互作用以及与 IGF1 或 IGF2 和糖蛋白 (ALS) 形成的三元复合物进一步强调了 IGFBP-3 的多种作用。复杂的相互作用网络，包括与护脑素和 TMEM219 的相互作用，凸显了 IGFBP-3 在调节与生长和凋亡相关的细胞过程和信号通路方面的多方面性质。

生物活性

Measured by its binding ability in a functional ELISA. Immobilized Human IGFBP3 Protein at 1 μg/mL (100 μL/well) can bind IGF1 with a linear range of 0.158-23.05ng/mL.

种属

Human

表达宿主

HEK293 cells

Calculated MW

29.58 kDa

Observed MW

40-50 kDa

标签

C-His

纯度

> 95% by SDS-PAGE.

内毒素

<1EU/μg

制剂

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

描述

Recombinant Human IGFBP-3 Protein is produced by HEK293 cells expression system. The target protein is expressed with sequence (Gly28-Lys291) of human IGFBP3/BP-53 (Accession #NP_000589.2) fused with a 6×His tag at the C-terminus.

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 vial 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

The Insulin-like Growth Factor (IGF) signaling system plays a central role in cellular growth, differentiation, and proliferation. IGFBP3 is the most abundant IGF binding protein in human serum and is a growth inhibitory, apoptosis-inducing molecule, capable of acting via IGF-dependent and IGF-independent mechanisms. It appears to function both by cell cycle blockade and the induction of apoptosis. IGFBP3 can be transported to the nucleus by an importin beta mediated mechanism, where it has been shown to interact with the retinoid X receptor alpha and possibly other nuclear elements. IGFBP3 antiproliferative signaling appears to require an active transforming growth factor-beta (TGF-beta) signaling pathway, and IGFBP3 stimulates phosphorylation of the TGF-beta signaling intermediates Smad2 and Smad3. IGFBP3 has IGF-independent roles in inhibiting cell proliferation in cancer cell lines. Nuclear transcription factor, retinoid X receptor (RXR)-alpha, and IGFBP3 functionally interact to reduce prostate tumor growth and prostate-specific antigen in vivo. Several clinical studies have proposed that individuals with IGFBP3 levels in the upper range of normal may have a decreased risk for certain common cancers. This includes evidence of a protective effect against breast cancer, prostate cancer, colorectal cancer, and lung cancer. Moreover, IGFBP3 inhibits insulin-stimulated glucose uptake into adipocytes independent of IGF.

基因ID

3486

Swiss Prot

P17936-1

别名

IGFBP3;BP-53;IBP3