Single-stranded DNA-binding protein that preferentially binds to the sterol regulatory element (SRE) sequence 5'-GTGCGGTG-3', and thereby mediates transcriptional repression (PubMed:2562787). Has a role as transactivator of the Myc promoter (By similarity). Binds single-stranded RNA in a sequence-specific manner (By similarity). Binds G-rich elements in target mRNA coding sequences (PubMed:28329689). Prevents G-quadruplex structure formation in vitro, suggesting a role in supporting translation by resolving stable structures on mRNAs (PubMed:28329689). Binds to RNA. Binds to RNA. Binds to RNA. Binds to RNA. Binds to RNA. Associates with the 40S ribosomal subunit, the 80S ribosome and with polysomes. Expressed in the liver, kidney, spleen, testis, lung, muscle and adrenal glands. Transcriptionally up-regulated by sterol treatment. Arginine methylation by PRMT1 in the Arg/Gly-rich region impedes RNA binding. The disease is caused by variants affecting the gene represented in this entry. The causative mutation is a CCTG expansion (mean approximately 5000 repeats) located in intron 1 of the CNBP gene.