METTL5 is an RNA methyltransferase whose stability was noted to be poor when expressed in both mammalian and bacterial expression systems. To determine if METTL5 has an endogenous stabilizing binding partner, FLAG-tagged METTL5 was expressed in Freestyle 293 cells and pulled down with anti-FLAG-M2 antibody-coupled magnetic beads. Bound proteins were fractionated by SDS-PAGE, and bands of interest were cut out for proteomics analysis.