Biochemical approach for isolation of polyadenylated RNAs with bound proteins from yeast.

Summary In vivo characterization of RNA-protein interactions is the key for understanding RNA regulatory mechanisms. Herein, we describe a protocol for detection of proteins interacting with polyadenylated RNAs in the yeast Saccharomyces cerevisiae. Proteins are crosslinked to nucleic acids in vivo by ultraviolet (UV) irradiation of cells, and poly(A)-containing RNAs with bound proteins are isolated from cell lysates using oligo[dT]25 beads. RBPs can be detected by immunoblot analysis or with mass spectrometry to define the mRNA-binding proteome (mRBPome) and its changes under stress. For complete details on the use and execution of this protocol, please refer to Matia-Gonzalez et al. (2021 , 2015) .