Casein kinase 1 ? 2 (CK1?2) can interact and phosphorylate the metastatic tumor antigen 1 short form (MTA1s) co-localizing it in the cytoplasm. Phosphorylated MTA1s then sequesters the estrogen receptor-? in the cytoplasm of breast cancer cells. CK1?2 hyperphosphorylates the ceramide transfer protein CERT leading to a decrease in de novo sphingomyelin synthesis. The reduction in synthesis of sphingomyelin is reversed by the expression of CERT mutants that are not hyperphosphorylated.
General description
Casein kinase 1 ? 2 (CK1?2) is a member of the CK1 family of serine/threonine protein kinases which play an important role in diverse cell processes, including DNA replication and repair. It is a ubiquitously expressed cytoplasmic kinase. The gene encoding this protein is localized on human chromosome 19p13.3.
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