Transcription factor that regulates the expression of the gene cluster that mediates the biosynthesis of apicidin F (PubMed:23825955, PubMed:25058475). Binds to the eight-base-pair motif 5'-TGACGTGA-3' called the 'Api-box' that is found in all promoters of the apicidin F cluster except in the promoter region of apf2 itself (PubMed:25058475). Contains a basic DNA-binding region at the N-terminus which is usually found in bZIP transcription factors, but does not contain the characteristic leucine zipper domain (PubMed:25058475). Instead, four C-terminal ankyrin repeats were identified that were shown to confer protein-protein interaction of regulatory proteins (PubMed:25058475). Leads to the loss of apicidin F production (PubMed:25058475). Apicidin F, like the other known apicidins, is a cyclic tetrapeptides with anti-malarial properties via histone deacetylase inhibitory activity (PubMed:24195442). Belongs to the bZIP family. Highly divergent.