MDA-MB-231 cells were cotransfected with pcDNA3.1-MS2, pcDNA3.1-MS2- NUDT3-AS4, pcDNA3.1-MS2- NUDT3-AS4 –Mut (miR-99s) and pMS2-GST. After 36 h, cells were used to perform RNA immunoprecipitation (RIP) experiments and RNA purification using GSH agarose beads (GE Healthcare) and the Magna RIP™ RNA-Binding Protein Immunoprecipitation Kit (Millipore, Bedford, MA) as described previously22 (link). pMS2-GST and pMS2 plasmid were gifts from Dr. Gorospe22 (link). The RNA fraction isolated by RIP was quantified by NanoDrop ND1000 (Thermo-Fisher Scientific, Waltham, MA) and its quality was assessed by Agilent 2100 Bioanalyzer (Agilent).
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