FunctionIsoform 2 may participate in the regulation of nucleoplasmic coilin protein interactions in neuronal and transformed cells. Isoform 3 can regulate global protein synthesis by altering nucleolar numbers. Isoform 4 may play a role as a modulator of APP processing. Overexpression can down-regulate APP processing.
Tissue specificityHighly expressed in marrow from patients with pre-B ALL associated with the t(1;19) translocation. Strongly expressed in brain and testis. Expressed in fetal brain. Isoform 4 is highly expressed in brain (at protein level). Isoform 6 is expressed in brain and several cancer cell lines.
Post-translational modificationsIsoform 3 nuclear translocation requires an NMDAR-dependent proteolytic cleavage.
Cellular localizationCytoplasm; Nucleus; Cell junction > synapse > postsynaptic cell membrane > postsynaptic density. Cell projection > dendritic spine. Nucleus. Nucleus > Cajal body. The synaptic localization requires DLG4 interaction. Translocation to the nucleus in response to stimulation of NMDA receptors (NMDARs) in a calcium-independent manner and Nucleus. The interaction with APP causes its partial exclusion from the nucleus, when APP is overexpressed.