an RNA binding and processing protein that binds to the dendritic targeting element and may play a role in mRNA trafficking. Part of a ternary complex that binds to the downstream control sequence (DCS) of the pre-mRNA. Mediates exon inclusion in transcripts that are subject to tissue-specific alternative splicing. May interact with single-stranded DNA from the far-upstream element (FUSE). May activate gene expression. Also involved in degradation of inherently unstable mRNAs that contain AU-rich elements (AREs) in their 3' untranslated regions, possibly by recruiting degradation machinery to ARE-containing mRNAs. Interacts with APC which is part of the apolipoprotein B mRNA editing enzyme complex. The interaction is not required for activity of the catalytic component, APOBEC1, but may confer stability on the complex. Note: This description may include information from UniProtKB.