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Polyadenylation is an essential cellular process in eukaryotic cells (Edmonds M and Abrams R, J Biol Chem 235, 1142-1149, 1960; Zhao J et al., Microbiol Mol Biol Rev 63, 405-445, 1999; Edmonds M, Progr Nucleic Acid Res Mol Biol 71, 285-389, 2002). For this reason, it has been difficult to examine the functions of specific polyadenylation proteins in vivo. Here, we describe a cell culture assay that allows structure-function experiments on CstF-64, a protein that binds to pre-mRNAs downstream of the cleavage site for accurate and efficient polyadenylation. We also demonstrate that the stem-loop luciferase assay for polyadenylation (SLAP) accurately reflects CstF-64-dependent polyadenylation. This assay could be easily adapted to the study of other important RNA-binding proteins in polyadenylation.

The Stem-Loop Luciferase Assay for Polyadenylation (SLAP) Method for Determining CstF-64-Dependent Polyadenylation Activity