Cell Signaling Technology

Product Pathways - PathScan ELISA

PathScan® Phospho-Syk (Tyr525/526) Sandwich ELISA Kit #7970

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Kit Includes Volume Solution Color
Phospho-Syk Ab Coated Microwells 96 assays
Syk Detection Ab 11 ml Green
Anti-mouse IgG, HRP-linked Antibody 11 ml Red
TMB Substrate #7004 11 ml Colorless
STOP Solution #7002 11 ml Colorless
Sealing Tape 2 sheets
ELISA Wash Buffer (20X) 25 ml Colorless
ELISA Sample Diluent 25 ml Blue
Cell Lysis Buffer (10X) #9803 15 ml Yellowish

Note: 12 8-well modules –Each module is designed to break apart for 8 tests.
Note: Kit should be stored at 4°C with the exception of Cell Lysis Buffer, which is stored at –20°C (packaged separately).

Species Cross-Reactivity

H

Reactivity Key:  H=Human
Species enclosed in parentheses are predicted to react based on 100% sequence homology.

Description

The PathScan® Phospho-Syk (Tyr525/526) Sandwich ELISA Kit is a solid phase sandwich enzyme-linked immunosorbent assay (ELISA) that detects endogenous levels of Syk when phosphorylated at tyrosine 525/526. A phospho-Syk (Tyr525/526) Rabbit mAb has been coated onto the microwells. After incubation with cell lysates, Syk phosphorylated at Tyrosine525/526 is captured by the coated antibody. Following extensive washing, a Syk mouse monoclonal detection antibody is added to detect the captured Syk protein. HRP-linked, Anti-mouse Ab is then used to recognize the bound detection antibody. HRP substrate, TMB, is added to develop color. The magnitude of the absorbance for this developed color is proportional to the quantity of Syk phosphorylated on Tyr525/526.Antibodies in kit are custom formulations specific to kit.

Specificity / Sensitivity

CST's PathScan® Phospho-Syk (Tyr525/526) Sandwich ELISA Kit #7970 detects endogenous levels of Syk protein when phosphorylated at Tyr525/526. This kit detects proteins from the indicated species, as determined through in-house testing, but may also detect homologous proteins from other species.

ELISA

ELISA

Figure 2. The relationship between protein concentration of untreated or goat anti-human IgM treated Ramos cell lysates and the absorbance at 450 nm is shown. Cells were serum starved overnight and then treated with goat anti-human IgM (10 μg/ml) for 10 min. at 37ºC.

ELISA - Western correlation

ELISA - Western correlation

Figure 1. Treatment of Ramos cells with goat anti-human IgM stimulates tyrosine phosphorylation of Syk, detected by PathScan® Phospho-Syk (Tyr525/526) Sandwich ELISA Kit #7970, but does not affect the levels of total Syk protein detected by western blot analysis. The absorbance readings at 450 nm are shown in the top figure, while the corresponding western blots, using Syk Antibody #2712 (left panel), or Phospho-Syk (Tyr525/526) (C87C1) Rabbit mAb #2710 (right panel) are shown in the bottom figure.

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 investigators have indicated that 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 at Tyr323 provides a direct binding site for the TKB domain of Cbl (6,7). Tyr352 of Syk is involved in the association of PLCγ1 (8). Tyr525 and Tyr526 are located in the activation loop of the Syk kinase domain; phosphorylation at Tyr525/526 of human Syk (equivalent to Tyr519/520 of mouse Syk) is essential for Syk function (9).

  1. Cheng, A.M. and Chan, A.C. (1997) Curr. Opin. Immunol. 9, 528-533.
  2. Kurosaki, T. et al. (1997) Curr. Opin. Immunol. 9, 309-318.
  3. Chu, D.H. et al. (1998) Immunol. Rev. 165, 167-180.
  4. Turner, M. et al. (2000) Immunol. Today 21, 148-154.
  5. Coopman, P.J. et al. (2000) Nature 406, 742-747.
  6. Deckert, M. et al. (1998) J. Biol. Chem. 273, 8867-8874.
  7. Rao, N. et al. (2001) EMBO J. 20, 7085-7095.
  8. Law, C.L. et al. (1996) Mol. Cell. Biol. 16, 1305-1315.
  9. Zhang, J. et al. (2000) J. Biol. Chem. 275, 35442-35447.

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