Important transcriptional activator regulating the expression of genes involved in immune and inflammatory responses. Binds to regulatory regions of several acute-phase and cytokines genes and probably plays a role in the regulation of acute-phase reaction, inflammation and hemopoiesis. The consensus recognition site is 5'-T[TG]NNGNAA[TG]-3'. Functions in brown adipose tissue (BAT) differentiation. Regulates the transcriptional induction of peroxisome proliferator-activated receptor gamma (PPARG). Binds to the MGF and MIM-1 promoters and activates the transcription of these genes. Important transcription factor regulating the expression of genes involved in immune and inflammatory responses (PubMed:8467792). Also plays a significant role in adipogenesis, as well as in the gluconeogenic pathway, liver regeneration, and hematopoiesis. The consensus recognition site is 5'-T[TG]NNGNAA[TG]-3'. Its functional capacity is governed by protein interactions and post-translational protein modifications. Binds DNA as a dimer. Interacts (not methylated) with MED23, MED26, SMARCA2, SMARCB1 and SMARCC1 (PubMed:20111005). Specifically expressed in myelomoncytic cells. Methylated. Methylation at Arg-3 by CARM1 and at Lys-39 by EHMT2, inhibit transactivation activity. Methylation is probably inhibited by phosphorylation at Thr-220. Belongs to the bZIP family. C/EBP subfamily.