SON protein is a protein that in humans is encoded by the SON gene. The protein encoded by this gene binds to a specific DNA sequence upstream of the upstream regulatory sequence of the core promoter and second enhancer of human hepatitis B virus (HBV). Through this binding, it represses HBV core promoter activity, transcription of HBV genes, and production of HBV virions. The protein shows sequence similarities with other DNA-binding structural proteins such as gallin, oncoproteins of the MYC family, and the oncoprotein MOS. It may also be involved in protecting cells from apoptosis and in pre-mRNA splicing. Several transcript variants encoding different isoforms have been described for this gene, but the full-length nature of only two of them has been determined. [provided by RefSeq].
Represses hepatitis B virus (HBV) core promoter activity and transcription of HBV genes and production of HBV virions. Binds to the consensus DNA sequence: 5'-GA[GT]AN[CG][AG]CC-3'. Might protect cells from apoptosis. Might be involved in pre-mRNA splicing (By similarity).