S100A8 蛋白, Human (N-His)

S100A8 consists of calcium and zinc bound S100A8, which plays a critical regulatory role in inflammation and immune responses. As calprotectin, it contributes to leukocyte function, regulates the cytoskeleton, and activates intracellular NADPH oxidase. S100A8 Protein, Human (N-His) is the recombinant human-derived S100A8 protein, expressed by E. coli , with N-6*His labeled tag. The total length of S100A8 Protein, Human (N-His) is 93 a.a., with molecular weight of ~12 kDa.

S100A8 由钙和锌结合 S100A8 组成，在调节炎症过程和免疫反应中发挥着至关重要的作用。通常以钙卫蛋白 (S100A8/A9) 形式存在，它具有多种细胞内功能，包括促进白细胞花生四烯酸运输和代谢、在吞噬细胞迁移过程中调节微管蛋白依赖性细胞骨架以及激活中性粒细胞 NADPH 氧化酶。特别是，它通过帮助酶复合物在细胞膜上组装、转移花生四烯酸并直接与 NCF2/P67PHOX 结合来激活 NADPH 氧化酶。在细胞外，它表现出促炎、抗菌、清除氧化剂和诱导细胞凋亡的活性。作为警报素或危险相关分子模式 (DAMP) 分子，S100A8 通过与 Toll 样受体 4 (TLR4) 和晚期糖基化终末产物受体 (AGER) 等模式识别受体结合来刺激先天免疫细胞，从而激活 MAP 激酶和 NF-kappa-B 信号通路并放大促炎级联反应。它具有针对细菌和真菌的抗菌活性，很可能通过微生物生长所必需的 Zn(2+) 螯合作用发挥这种作用。此外，S100A8/A9 通过自噬和细胞凋亡诱导细胞死亡，调节中性粒细胞数量和细胞凋亡，并充当氧化剂清除剂以防止组织损伤。它在自身免疫和癌症发展中作为炎症放大器的作用是值得注意的，并且在微生物感染（例如 SARS-CoV-2）中，它可能以 TLR4 依赖性方式诱导异常未成熟中性粒细胞的扩增。

Data is not available.

Human

E. coli

N-6*His

P05109(M1-E93)

6279  [NCBI]

MLTELEKALNSIIDVYHKYSLIKGNFHAVYRDDLKKLLETECPQYIRKKGADVWFKELDINTDGAVNFQEFLILVIKMGVAAHKKSHEESHKE

Approximately 12 kDa

Greater than 90% as determined by reducing SDS-PAGE.

无菌粉末.

Lyophilized from a 0.22 μm filtered solution of 50 mM Tris-HCL, 300 mM NaCl, pH 7.4, 5% trehalose, 5% mannitol and 0.01% Tween80.

<1 EU/μg, determined by LAL method.

It is not recommended to reconstitute to a concentration less than 100 μg/mL in ddH₂O. For lower concentration, please reconstitute in 50 mM Tris-HCL, 300 mM NaCl, pH 7.4 buffer.

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.