Schematic presentation of SUD, Paip1, and PABP. Interactions between SUD and Paip1, as well as PAPB and Paip1 are indicated by red and black lines, respectively. PAM: PABP-binding motif; Paip1M: the middle domain of Paip1; RRM: RNA-recognition motif; PABC: the C-terminal domain of PABP. 