Plays a role in RNA-mediated gene silencing by micro-RNAs (miRNAs). Required for miRNA-dependent translational repression of complementary mRNAs by argonaute family proteins. As scaffoldng protein associates with argonaute proteins bound to partially complementary mRNAs and simultaneously can recruit CCR4-NOT and PAN deadenylase complexes. {ECO:0000269|PubMed:19304925, ECO:0000269|PubMed:21981923, ECO:0000269|PubMed:21984184, ECO:0000269|PubMed:21984185}. This is the function of ENSG00000078687 (TNRC6C, trinucleotide repeat containing adaptor 6C).