Acts as a transcriptional regulator. Promotes transcription repression. Promotes transcription activation in differentiated myotubes. Binds to double- and single-stranded DNA sequences. Binds to the transcription suppressor CATR sequence of the COX5B promoter. Binds with high affinity to RNA molecules that contain AU-rich elements (AREs) found within the 3'-UTR of many proto-oncogenes and cytokine mRNAs. Binds both to nuclear and cytoplasmic poly(A) mRNAs. Binds to poly(G) and poly(A), but not to poly(U) or poly(C) RNA homopolymers. Binds to the 5'-ACUAGC-3' RNA consensus sequence (By similarity). Interacts with TNPO1 and ZNF148. Shuttles between the nucleus and the cytoplasm in a TNPO1-dependent manner. Dimethylation of Arg-310 is probably of the asymmetric type.