Binds to the ABA-responsive element (ABRE). Could participate in abscisic acid-regulated gene expression. DNA-binding heterodimer (By similarity). Interacts with ABI3 and the AFP proteins AFP1, AFP2, AFP3 and AFP4. A number of isoforms are produced. According to EST sequences. Up-regulated by abscisic acid (ABA) and cold. Phosphorylated by CPK4, CPK11, SRK2D and SRK2I in vitro. Belongs to the bZIP family. ABI5 subfamily.