Scaffolding protein that specifically recognizes and binds dimethylarginine-containing proteins (PubMed:15955813). Plays a role in the regulation of translation of target mRNAs by binding Arg/Gly-rich motifs (GAR) in dimethylarginine-containing proteins. In nucleus, acts as a coactivator: recognizes and binds asymmetric dimethylation on the core histone tails associated with transcriptional activation (H3R17me2a and H4R3me2a) and recruits proteins at these arginine- methylated loci (PubMed:21172665). In cytoplasm, acts as an antiviral factor that participates in the assembly of stress granules together with G3BP1 (PubMed:35085371). {ECO:0000269|PubMed:15955813, ECO:0000269|PubMed:18632687, ECO:0000269|PubMed:21172665, ECO:0000269|PubMed:35085371}. This is the function of ENSG00000083544 (TDRD3, tudor domain containing 3).