Binds to the GM-CSF promoter. Seems to act as a repressor. Binds also to full-length mRNA and to short RNA sequences containing the consensus site 5'-UCCAUCA-3'. May have a role in translation repression (By similarity). Found in a mRNP complex with YBX2 (By similarity). Interacts with RRP1B (PubMed:19710015). Additional isoforms seem to exist. Highly expressed in skeletal muscle and heart. Extended N-terminus.