Transcriptional regulator involved in phagocytosis and pinocytosis. Both activates and represses transcription. Regulates expression of acaA, carA, pkaC, csaA, cotB and lagC (PubMed:11162086, PubMed:15470262, PubMed:16607013, PubMed:19343174, PubMed:23355006, PubMed:26339297). Promotes amplification of the tRNA gene-associated retrotransposon TRE5-A, a mobile genetic element formerly called as Dictyostelium repetitive element (DRE). Suppresses agnC and agnE encoding argonaute proteins which are part of a RNA interference pathway controlling TRE5-A amplification. Required for amplification of both sense and antisense RNA transcripts, but does not activate their promoters found in A-module and C-module of the TRE5-A, respectively (PubMed:21076008, PubMed:26339297). Nevertheless, binds to distinct DNA sequences containing A and T stretches within the C-module in vitro (PubMed:10491202, PubMed:8898890, PubMed:11162086). Monomer. The C-terminal domain (724-998) alone is able to regulate gene expression (PubMed:19343174, PubMed:23355006, PubMed:26339297). The C-terminal domain (724-998) is required and sufficient to maintain high steady-state levels of both sense and antisense RNA transcripts of the tRNA gene-associated retrotransposon TRE5-A (PubMed:21076008). A.T hook involved in DNA-binding is important for the gene regulatory function in vivo.