Phospho-Smad3 (Ser423) Polyclonal Antibody, AbBy Fluor™ 647 Conjugated

Smad3 is a 50 kDa member of a family of proteins that act as key mediators of TGF beta superfamily signaling in cell proliferation, differentiation and development. The Smad family is divided into three subclasses: receptor regulated Smads, activin/TGF beta receptor regulated (Smad2 and 3) or BMP receptor regulated (Smad 1, 5, and 8) ; the common partner, (Smad4) that functions via its interaction to the various Smads; and the inhibitory Smads, (Smad6 and 7) . Activated Smad3 oligomerizes with Smad4 upon TGF beta stimulation and translocates as a complex into the nucleus, allowing its binding to DNA and transcription factors. Phosphorylation of the two TGF beta dependent serines 423 and 425 in the C terminus of Smad3 is critical for Smad3 transcriptional activity and TGF beta signaling.

Smad3 phospho Ser423; Smad3 phospho S423; p-Smad3 Ser423; hMAD 3; hSMAD3; HSPC193; JV15 2; JV152; MAD mothers against decapentaplegic Drosophila homolog 3; MAD3; MADH 3; MADH3; Mothers against decapentaplegic homolog 3; Mothers against DPP homolog 3; SMA and MAD related protein 3; SMAD 3; SMAD; SMAD-3; SMAD3_HUMAN.