Catalog # PX3415

phospho-p38α MAP Kinase (Tyr-323) Peptide

Blocking Peptide

Application / Dilution
ELISA50 ng/well

Size 50 μg



p38 MAP kinase (MAPK), also called RK, CSBP, and SAPK2a, is the mammalian orthologue of the yeast HOG kinase. This family of kinases participates in signaling cascades that control cellular responses to cytokines and stress. Four isoforms of p38 MAPK (α,β,γ,δ) have been identified. Similar to the SAPK/JNK pathway, p38 MAPK is activated by a variety of cellular stresses including osmotic shock, inflammatory cytokines, lipopolysaccharides, UV light, and growth factors. MKK3 and SEK activate p38 MAPK by dual phosphorylation at Thr-180/Tyr-182. Activated p38 MAPK has been shown to phosphorylate and activate MAPKAP kinase 2 and to phosphorylate the transcription factors ATF-2, Max and MEF2. T cells possess an alternative pathway for p38 activation where stimulation of the antigen receptor (TCR) induces phosphorylation of p38 on Tyr-323. This site is required for TCR-mediated phosphorylation of Thr-180 and catalytic activity. Thus, Tyr-323 may also have important roles in regulating p38 MAP kinase pathways.



Jirmanova, L. et al. (2009) Blood 113(10):2229.
Salvador, J.M. et al. (2005) Nat Immunol. 6(4):390.
Han, J. et al. (1994) Science 265:808.
Lee, J. C. et al. (1994) Nature 372:739.

Phospho-p38α MAP Kinase (Tyr-323) synthetic peptide corresponding to amino acid residues surrounding tyrosine 323 in mouse p38α. This peptide sequence is highly conserved in human and rat p38α, and has high homology to the conserved site in p38β.

*For more information, see UniProt Accession P47811
Blocking Peptide is supplied in 50µl phosphate-buffered saline and 0.05% sodium azide. Store at –20°C. Stable for 1 year.

The products are are safely shipped at ambient temperature for both domestic and international shipments. Each product is guaranteed to match the specifications as indicated on the corresponding technical data sheet. Please store at -20C upon arrival for long term storage.

The peptide is specifically recognized by p38α (Tyr-323), phospho-specific antibody (PP3411) in ELISA, and has been shown to block the reactivity of PP3411 in Western blot. In addition, the peptide is recommended for use in blocking PP3411 reactivity in immunocytochemistry.

*All molecular weights (MW) are confirmed by comparison to Bio-Rad Rainbow Markers and to western blot mobilities of known proteins with similar MW.

This kit contains: