The PRMT8 Chemiluminescent Assay Kit is designed to measure PRMT8 activity for screening and profiling applications. The PRMT8 Chemiluminescent Assay Kit comes in a convenient format with a 96-well plate precoated with histone H4 peptide substrate, the antibody against methylated arginine 3 (R3) residue of Histone H4, the secondary HRP-labeled antibody, Sadenosylmethionine, methyltransferase assay buffer, and purified PRMT8 enzyme for 100 enzyme reactions. The key to the PRMT8 Chemiluminescent Assay Kit is a highly specific antibody that recognizes methylated R3 residue of Histone H4. With this kit, only three simple steps on a microtiter plate are required for methyltransferase detection. First, S-adenosylmethionine is incubated with a sample containing assay buffer and methyltransferase enzyme. Next, primary antibody is added. Finally, the plate is treated with an HRP-labeled secondary antibody followed by addition of the HRP substrate to produce chemiluminescence that can then be measured using a chemiluminescence reader.