Terminal nucleotidyltransferase 4B (TENT4B)

Catalytic subunit of a TRAMP-like complex that has a poly(A) RNA polymerase activity and is involved in a post- transcriptional excellent control mechanism. Polyadenylation with short oligo(A) tails is needed for the degradative action of the exosome on several of its nuclear RNA substrates.

Doesn't need a cofactor for polyadenylation activity (in vitro) (PubMed:21788334, PubMed:21855801). Required for cytoplasmic polyadenylation of mRNAs involved in carbohydrate metabolism, including the glucose transporter SLC2A1/GLUT1 (PubMed:28383716).