Transcriptional repressor; DNA-binding protein that specifically recognizes the core sequence 5'-YAAC[GT]G-3'. Dimerization with PFN1 reduces its DNA-binding capacity. Interacts with PFN1. Homodimer and heterodimer with PFN1. Ubiquitous. Highly expressed in brain, liver and testis. Moderate expression in heart, lung and skeletal muscle. Low expression in spleen and kidney. The proline-rich region is required for PFN1 interaction.