Single- and double-stranded RNA-binding protein that interferes with the RNA editing activities of ADAR/ADAR1 and ADARB1/ADAR2. Likely competes with these proteins for target binding, repressing RNA editing across the transcriptome (PubMed:10836796, PubMed:28167531, PubMed:35850307). Additionally, it binds and stabilizes specific mRNAs and regulates the expression of proteins such as MAVS, DUSP1, and EGR1, independently of RNA editing mechanisms (PubMed:31552420, PubMed:35850307). {ECO:0000269|PubMed:10836796, ECO:0000269|PubMed:28167531, ECO:0000269|PubMed:31552420, ECO:0000269|PubMed:35850307}. This is the function of ADARB2 (adenosine deaminase RNA specific B2 (inactive), Ensembl gene identifier ENSG00000185736).