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RNA–protein interactions profoundly impact organismal development and function through their contributions to the basal gene expression machineries and their regulation of post-transcriptional processes. The repertoire of predicted RNA binding proteins (RBPs) in plants is particularly large, suggesting that the RNA–protein interactome in plants may be more complex and dynamic even than that in metazoa. To dissect RNA–protein interaction networks, it is necessary to identify the RNAs with which each RBP interacts and to determine how those interactions influence RNA fate and downstream processes. Identification of the native RNA ligands of RBPs remains a challenge, but several high-throughput methods for the analysis of RNAs that copurify with specific RBPs from cell extract have been reported recently. This chapter reviews approaches for defining the native RNA ligands of RBPs on a genome-wide scale and provides a protocol for a method that has been used to this end for RBPs that localize to the chloroplast.
