Catalog # SX4635

phospho-Sphingosine Kinase 2 (Thr-578) Peptide

Blocking Peptide

Application / Dilution
ELISA50 ng/well

Size 50 μg



Sphingolipids are metabolized into bioactive products that include ceramide, sphingosine, and sphingosine-1-phosphate (S1P). Sphingosine Kinase (SK) catalyzes the phosphorylation of the lipid sphingosine, creating S1P. S1P subsequently signals through cell surface G protein-coupled receptors, as well as intracellularly, to modulate cell proliferation, survival, motility and differentiation. Two isoforms of SK have been identified, SK1 and SK2. The mRNA for both of these isoforms is widely expressed with SK1 expression highest in brain, heart, kidney, thymus, spleen and lung, while SK2 is highest in kidney and liver. SKs can be activated through growth factor, G protein-coupled, and immunoglobulin receptor signalling. Regulation of SK1 and SK2 activity may occur through phosphorylation. SK1 is phosphorylated at Ser-225 by ERK leading to increased activity and translocation to the plasma membrane. SK2 is phosphorylated in response to EGF, PKC activators, and phorbol esters. ERK1 can phosphorylate both Ser-351 and Thr-578, and non-phosphorylatable mutants of these sites suppress ERK1-mediated chemotaxis.



Hait, N.C. et al. (2007) J Biol. Chem. 282(16):12058.
Hait, N.C. et al. (2005) J Biol. Chem. 280:29462.
Spiegel, S. & Milstien, S. (2003) Nat. Rev. Mol. Cell Biol. 4:397.

Phospho-SK2 (Thr-578) synthetic peptide corresponding to amino acid residues surrounding Thr-578 in human SK2. This peptide sequence is highly conserved in rat and mouse SK2 proteins, and is not well conserved in SK1.

*For more information, see UniProt Accession Q9NRA0
Blocking Peptide is supplied in 50µl phosphate-buffered saline and 0.05% sodium azide.

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 anti-SK2 (Thr-578) phospho-specific antibody (SP4631) in ELISA, and has been shown to block the reactivity of SP4631 during Western blot. In addition, the peptide is recommended for use in blocking SP4631 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: