Enables several functions, including DNA-binding transcription activator activity, RNA polymerase II-specific; SMAD binding activity; and transcription coregulator binding activity. Contributes to DNA binding activity and DNA-binding transcription factor activity. Involved in several processes, including cell surface receptor protein serine/threonine kinase signaling pathway; positive regulation of transforming growth factor beta receptor signaling pathway; and regulation of gene expression. Acts upstream of or within negative regulation of canonical Wnt signaling pathway. Located in several cellular components, including centrosome; chromatin; and nucleoplasm. Part of activin responsive factor complex and heteromeric SMAD protein complex. Implicated in several diseases, including female reproductive organ cancer (multiple); hereditary hemorrhagic telangiectasia; juvenile polyposis syndrome; juvenile polyposis-hereditary hemorrhagic telangiectasia syndrome; and seminoma. Biomarker of several diseases, including carcinoma (multiple); colorectal adenoma; female reproductive organ cancer (multiple); metabolic dysfunction-associated steatohepatitis; and prostate carcinoma in situ.
Amlodipine inhibits the reaction [[Doxorubicin co-treated with TGFB1 protein] results in increased expression of SMAD4 mRNA] and Amlodipine inhibits the reaction [[Doxorubicin co-treated with TGFB1 protein] results in increased expression of SMAD4 protein]
[Cadmium Chloride results in increased abundance of Cadmium] which results in decreased expression of SMAD4 protein and BMP4 protein inhibits the reaction [[Cadmium Chloride results in increased abundance of Cadmium] which results in decreased expression of SMAD4 protein]
[Cadmium Chloride results in increased abundance of Cadmium] which results in decreased expression of SMAD4 protein and BMP4 protein inhibits the reaction [[Cadmium Chloride results in increased abundance of Cadmium] which results in decreased expression of SMAD4 protein]
SERPINB5 protein promotes the reaction [Doxazosin results in increased expression of SMAD4 mRNA] and SERPINB5 protein promotes the reaction [Doxazosin results in increased expression of SMAD4 protein]
Fenofibrate inhibits the reaction [SMAD4 protein results in increased expression of SERPINE1 mRNA] and NR0B2 protein promotes the reaction [Fenofibrate inhibits the reaction [SMAD4 protein results in increased expression of SERPINE1 mRNA]]
[SMAD4 protein co-treated with SMAD3 protein] affects the susceptibility to Nitric Oxide and Nitric Oxide results in increased activity of [SMAD4 protein binds to SMAD3 protein]
[platycodin D co-treated with osthol] results in decreased expression of SMAD4 mRNA and [platycodin D co-treated with osthol] results in decreased expression of SMAD4 protein
Ethanol inhibits the reaction [Iron Carbonyl Compounds results in increased expression of SMAD4 protein] and Quercetin inhibits the reaction [Iron Carbonyl Compounds results in increased expression of SMAD4 protein]
[NOG protein co-treated with Phenylmercuric Acetate co-treated with dorsomorphin co-treated with 4-(5-benzo(1 and 3)dioxol-5-yl-4-pyridin-2-yl-1H-imidazol-2-yl)benzamide] results in decreased expression of SMAD4 mRNA
[platycodin D co-treated with osthol] results in decreased expression of SMAD4 mRNA and [platycodin D co-treated with osthol] results in decreased expression of SMAD4 protein
4-(5-benzo(1 and 3)dioxol-5-yl-4-pyridin-2-yl-1H-imidazol-2-yl)benzamide inhibits the reaction [TGFB3 protein affects the localization of SMAD4 protein]
[NOG protein co-treated with trichostatin A co-treated with dorsomorphin co-treated with 4-(5-benzo(1 and 3)dioxol-5-yl-4-pyridin-2-yl-1H-imidazol-2-yl)benzamide] results in increased expression of SMAD4 mRNA
[NOG protein co-treated with Valproic Acid co-treated with dorsomorphin co-treated with 4-(5-benzo(1 and 3)dioxol-5-yl-4-pyridin-2-yl-1H-imidazol-2-yl)benzamide] results in decreased expression of SMAD4 mRNA