TNRC6-PABC_bdg is a natively unstructured region on the higher eukaryote TNRC6 subset of GW182 proteins that carries the binding motif for the interaction with Polyadenylate-binding protein 1, PABC. TNRC6 are trinucleotide repeat-containing gene 6 proteins required for miRNA-mediated gene silencing that are localised to the P bodies (processing bodies). P bodies are cytoplasmic mRNP aggregates that are involved in general mRNA translation repression and decay, including nonsense-mediated decay. Thus GW182 proteins are essential for microRNA-mediated translational repression and deadenylation in animal cells being a major component of miRISCs. The interaction motif that binds to PABC is ShNWPPEFHPGVPWKGLQ [1]. This region lies between a Q-rich region and the RRM, or RNA-recognition motif, Pfam:PF13893.

1: Structural insights into the human GW182-PABC interaction in microRNA-mediated deadenylation. Jinek M, Fabian MR, Coyle SM, Sonenberg N, Doudna JA; Nat Struct Mol Biol. 2010;17:238-240. PMID:20098421