Phospho-Syk (Tyr323) Antibody

• 产品编号：CST-2715P      品牌：Cell Signaling Technology       原厂货号：2715P
• 产品分类：抗体 > 一抗 > 磷酸化抗体
• 应用分类：

描述：

Phospho-Syk (Tyr323) Antibody只能检测内源的在Tyr323位点磷酸化的Syk蛋白。此抗体不与对应的酪氨酸残基磷酸化的其它Syk/Zap-70蛋白反应。此多克隆抗体是通过合成人源对应的Syk Tyr323位点周围的肽段或者鼠源对应的Syk Tyr317位点周围的肽段来免疫动物而获得。抗体是通过protein A和多肽亲和层析法纯化。Syk作为酪氨酸蛋白激酶在造血细胞的胞内信号转导中起了重要的作用(1-3)。 Syk能够与免疫受体的酪氨酸介导的活性区域(ITAMs)中的胞质部分结合(4)。它能偶联激活了的免疫受体进行下游的信号转导而引起一系列的细胞响应，如细胞增殖，分化以及吞噬(4)。有证据显示Syk在无免疫反应的细胞中也有作用，Syk在人类的乳腺癌中是个潜在的肿瘤抑制因子(5)。 Syk蛋白的SH2-激酶结合区域中Tyr323位点是个磷酸化的负调控位点 。 磷酸化的 Tyr323 为 Cbl的 TKB区域提供了结合位点(6,7)。 Syk 的 Tyrosine 352位点参与了与 PLC-γ1 的结合 (8)。 Tyrosines 525 位点和 526 位点位于 Syk 的激酶区域的活性环上。磷酸化人源的 Syk 的Tyr525/526位点(等同于小鼠 Syk的 Tyr519/520位点) 对 Syk 的功能有重要的影响(9)。

1. Cheng, A.M. and Chan, A.C. (1997) Curr Opin Immunol 9, 528-33.
2. Kurosaki, T. (1997) Curr Opin Immunol 9, 309-18.
3. Chu, D.H. et al. (1998) Immunol Rev 165, 167-80.
4. Turner, M. et al. (2000) Immunol Today 21, 148-54.
5. Coopman, P.J. et al. (2000) Nature 406, 742-7.
6. Deckert, M. et al. (1998) J Biol Chem 273, 8867-74.
7. Rao, N. et al. (2001) EMBO J 20, 7085-95.
8. Law, C.L. et al. (1996) Mol Cell Biol 16, 1305-15.
9. Zhang, J. et al. (2000) J Biol Chem 275, 35442-7.

原厂资料：

Homology

Species predicted to react based on 100% sequence homology: Mouse, Rat

Specificity / Sensitivity

Phospho-Syk (Tyr323) Antibody detects endogenous levels of Syk only when phosphorylated at Tyr323. It does not cross-react with other tyrosine-phosphorylated members of the Syk/Zap-70 tyrosine kinase family.

Source / Purification

Polyclonal antibodies are produced by immunizing animals with a synthetic phosphopeptide corresponding to residues surrounding Tyr323 of human Syk or Tyr317 of mouse Syk. Antibodies are purified by protein A and peptide affinity chromatography.

Background

Syk is a protein tyrosine kinase that plays an important role in intracellular signal transduction in hematopoietic cells (1-3). Syk interacts with immunoreceptor tyrosine-based activation motifs (ITAMs) located in the cytoplasmic domains of immune receptors (4). It couples the activated immunoreceptors to downstream signaling events that mediate diverse cellular responses, including proliferation, differentiation and phagocytosis (4). There is also evidence of a role for Syk in nonimmune cells, and Syk is a potential tumor suppressor in human breast carcinomas (5). Tyr323 is a negative regulatory phosphorylation site within the SH2-kinase linker region in Syk. Phosphorylation of Tyr323 provides a direct binding site to the TKB domain of Cbl (6,7). Tyrosine 352 of Syk is involved in the association of PLC-γ1 (8). Tyrosines 525 and 526 are located in the activation loop of the Syk kinase domain, and phosphorylation of Tyr525/526 of human Syk (equivalent to the Tyr519/520 of mouse Syk) is essential for Syk function (9).

1. Cheng, A.M. and Chan, A.C. (1997) Curr Opin Immunol 9, 528-33.
2. Kurosaki, T. (1997) Curr Opin Immunol 9, 309-18.
3. Chu, D.H. et al. (1998) Immunol Rev 165, 167-80.
4. Turner, M. et al. (2000) Immunol Today 21, 148-54.
5. Coopman, P.J. et al. (2000) Nature 406, 742-7.
6. Deckert, M. et al. (1998) J Biol Chem 273, 8867-74.
7. Rao, N. et al. (2001) EMBO J 20, 7085-95.
8. Law, C.L. et al. (1996) Mol Cell Biol 16, 1305-15.
9. Zhang, J. et al. (2000) J Biol Chem 275, 35442-7.

注意事项：

Storage: Supplied in 10 mM sodium HEPES (pH 7.5), 150 mM
NaCl, 100 µg/ml BSA and 50% glycerol. Store at –20°C.
Do not aliquot the antibody.