Emerging Roles of Disordered Sequences in RNA-Binding Proteins.

RNA-binding proteins (RBPs) maintain RNA metabolism homeostasis in the cell by regulating temporal, spatial, and functional dynamics of RNAs. RBPs achieve RNA binding not only through classical structured RNA-binding domains but also with sequences that are intrinsically disordered and often of low amino acid complexity. RBP-RNA interactions form ribonucleoprotein (RNP) complexes and emerging evidence indicates that RNPs form higher structures or lattices, promoting territories of phase transitions. Herein, we discuss the role of disordered sequences in RBPs, their function in RNPs and protein networks, as well as their regulation by post-translational modifications and how RBP deregulation leads to disease.