Protocol for detecting lncRNA-protein interactions in vitro by tRSA RNA pull-down assay

Long non-coding RNAs (lncRNAs) work together with diverse RNA-binding proteins (RBPs) to fulfill key regulations in important cellular functions. Here, we present a protocol to detect lncRNA-RBP interactions in vitro using a tRNA scaffold containing a streptavidin aptamer pull-down assay. We describe steps for preparing both protein and lncRNA transcripts, lncRNA-protein interaction detection with an in vitro binding assay, and western blot analysis. This protocol is applicable to screen for RNA-interacting proteins using cell lysates followed by mass spectrometry analysis. For complete details on the use and execution of this protocol, please refer to Yang et al. (2023).¹.