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Phospho-Smad3 (Ser423/425)/Smad1 (Ser463/465) Antibody #9514

Inquiry Info. # 9514

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    Product Specifications

    REACTIVITY
    SENSITIVITY Endogenous
    MW (kDa) 60
    SOURCE Rabbit

    Product Information

    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.

    Specificity / Sensitivity

    Phospho-Smad3 (Ser423/425)/Smad1 (Ser463/465) Antibody detects endogenous levels of Smad3 only when phosphorylated at serines 423 and 425. This antibody cross-reacts with Smad1 when phosphorylated at serines 463 and 465 and may cross-react with Smad5 and Smad8 when phosphorylated at the equivalent sites. This antibody does not cross-react with Smad2.

    Source / Purification

    Polyclonal antibodies are produced by immunizing animals with a synthetic phosphopeptide corresponding to residues surrounding Ser423 and Ser425 of human Smad3. Antibodies are purified by protein A and peptide affinity chromatography.

    Background

    Members of the SMAD family of signal transduction molecules are components of a critical intracellular pathway that transmit TGF-β signals from the cell surface into the nucleus. Three distinct classes of SMADs have been defined: the receptor-regulated SMADs (R-SMADs), which include SMAD1, 2, 3, 5, and 9; the common-mediator SMAD (co-SMAD), SMAD4; and the antagonistic or inhibitory SMADs (I-SMADs), SMAD6 and 7 (1-5). Activated type I receptors associate with specific R-SMADs and phosphorylate them on a conserved carboxy-terminal SSXS motif. The phosphorylated R-SMADs dissociate from the receptor and form a heteromeric complex with SMAD4, initiating translocation of the heteromeric SMAD complex to the nucleus. Once in the nucleus, SMADs recruit a variety of DNA binding proteins that function to regulate transcriptional activity (6-8).

    Following stimulation by TGF-β, Smad2 and Smad3 become phosphorylated at their carboxyl termini (Ser465 and 467 on Smad2; Ser423 and 425 on Smad3) by TGF-β Receptor I. Phosphorylated Smad 2/3 can complex with Smad4, translocate to the nucleus and regulate gene expression (9-11).

    Alternate Names

    BSP-1; BSP1; DKFZp586N0721; DKFZp686J10186; hMAD-3; hSMAD1; hSMAD3; HSPC193; HsT17436; JV15-2; JV4-1; JV41; LDS1C; LDS3; MAD homolog 1; MAD homolog 3; mad homolog JV15-2; mad protein homolog; Mad-related protein 1; MAD, mothers against decapentaplegic homolog 1; MAD, mothers against decapentaplegic homolog 3; Mad3; MADH1; MADH3; MADR1; MGC60396; Mothers against decapentaplegic homolog 1; Mothers against decapentaplegic homolog 3; Mothers against DPP homolog 1; Mothers against DPP homolog 3; SMA- and MAD-related protein 3; SMAD 1; SMAD 3; SMAD family member 1; SMAD family member 3; SMAD, mothers against DPP homolog 1; SMAD, mothers against DPP homolog 3; SMAD1; SMAD3; TGF-beta signaling protein 1; transforming growth factor-beta signaling protein 1; Transforming growth factor-beta-signaling protein 1

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