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Alterations in intracellular calcium levels activate several signal transduction pathways resulting in distinct patterns of gene expression. Here, a pathway for calcium-mediated signals is demonstrated that involves C/EBP beta, a member of the bZip family of transcription factors. In pituitary cells C/EBP beta was phosphorylated in response to increased intracellular calcium concentrations as a consequence of the activation of a calcium-calmodulin-dependent protein kinase. Phosphorylation of serine at position 276 within the leucine zipper of C/EBP beta appeared to confer calcium-regulated transcriptional stimulation of a promoter that contained binding sites for C/EBP beta.
Wegner et al. (Fri,) studied this question.
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