Function
Transcriptional coactivator for CREB1 which activates transcription through both consensus and variant cAMP response element (CRE) sites (PubMed:29211348). Acts as a coactivator, in the SIK/TORC signaling pathway, being active when dephosphorylated (PubMed:29211348). Acts independently of CREB1 'Ser-133' phosphorylation (By similarity). Enhances the interaction of CREB1 with TAF4 (By similarity). Regulates the expression of specific CREB-activated genes such as the steroidogenic gene, StAR (By similarity). Potent coactivator of PPARGC1A and inducer of mitochondrial biogenesis in muscle cells (By similarity).