Transcriptional coactivator stimulating NR5A1 and ligand-dependent NR1H3/LXRA and PPARG transcriptional activities. Enhances the DNA-binding activity of ATF1, ATF2, CREB1 and NR5A1. Regulates nitric oxid synthase activity probably by sequestering calmodulin in the cytoplasm. May function in endothelial cells differentiation, hormone-induced cardiomyocytes hypertrophy and lipid metabolism. Interacts with TBP and the transcription factor IID (TFIID) complex, NR5A2, NR1H3 and PPARG. Interaction with TBP is regulated by phosphorylation. Binds NR5A1, ATF1, FOS and JUN via their conserved basic region. Binding to calmodulin is regulated by calcium and phosphorylation of the IQ motif. Also nuclear upon binding to NR5A1 and treatment of cells with TPA or forskolin. Expressed in brain, liver, lung, kidney and heart (at protein level). Ubiquitously expressed. More abundant in heart, pancreas, liver, intestine and adipose tissues. Expressed in fetal tissues. More abundant in kidney. Down-regulated by HIV-1 Tat or phorbol ester (TPA) treatment in endothelial cells (at mRNA and protein levels). The IQ motif, which is involved in calmodulin binding, overlaps with the binding domain for nuclear receptors and transcription factors. Its phosphorylation probably allows a switch between the two activities of the protein (By similarity). Phosphorylated (by PKA and PKC).