SMAD1 is a member of the Mothers Against Dpp (MAD)-related family of proteins. So far, eight SMADs have been identified and can be divided into 3 subgroups based on their structure and function; pathway-restricted, common mediator and inhibitory. SMAD1, 5 and 8 serve as pathway-restricted SMADs for the bone morphogenetic protein (BMP) signaling pathway.
Smad1 is phosphorylated resulting in its association with the common-mediator subunit, Smad4. This heteromeric complex then translocates into the nucleus to exert transcriptional comodulator activity.
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