Transcription coactivator that binds to the 5'-AATA[CT]-3' core sequence and plays a key role in adipogenesis and liver development. Acts by forming a complex with phosphorylated PHF2, which mediates demethylation at Lys-336, leading to target the PHF2-ARID5B complex to target promoters, where PHF2 mediates demethylation of dimethylated 'Lys-9' of histone H3 (H3K9me2), followed by transcription activation of target genes. The PHF2-ARID5B complex acts as a coactivator of HNF4A in liver. Required for adipogenesis: regulates triglyceride metabolism in adipocytes by regulating expression of adipogenic genes. Overexpression leads to induction of smooth muscle marker genes, suggesting that it may also act as a regulator of smooth muscle cell differentiation and proliferation. Represses the cytomegalovirus enhancer. Widely expressed, including in liver (at protein level). The ARID domain mediates the interaction with DNA. Methylation at Lys-336 prevents DNA-binding. Demethylation by PHF2 promotes recruitment of the PHF2-ARID5B complex to promoters. Defects in ARID5B may be a cause of susceptibility to coronary atherosclerosis in the Japanese population. Disease susceptibility is associated with variants affecting the gene represented in this entry. Belongs to the ARID5B family. Contaminating sequence. Potential poly-A sequence. Extended N-terminus. Contaminating sequence. Potential poly-A sequence. Contaminating sequence. Potential poly-A sequence. Contaminating sequence. Potential poly-A sequence.