The function of Ensembl gene identifier ENSG00000090621 (PABPC4, poly(A) binding protein cytoplasmic 4) is as follows. Binds the poly(A) tail of mRNA (PubMed:8524242). Binds to SMIM26 mRNA and plays a role in its post-transcriptional regulation (PubMed:37009826). May be involved in cytoplasmic regulatory processes of mRNA metabolism. Can probably bind to cytoplasmic RNA sequences other than poly(A) in vivo (By similarity). {ECO:0000250|UniProtKB:P11940, ECO:0000269|PubMed:37009826, ECO:0000269|PubMed:8524242}.