Overexpression of Myc-PRMT6 does not alter Tat-FLAG mediated transactivation in either A549 or HeLa cells. (A) A549 cells were transfected with a long terminal repeat (LTR)-Photinus luciferase transactivation reporter plasmid along with varying amounts of Tat-FLAG plasmid, as indicated, and either with (black columns) or without (white columns) Myc-PRMT6 plasmid. All samples were cotransfected with a SV40-promotered Renilla luciferase plasmid to control for transfection efficiency and assay variations. Transfected cells were lysed and assayed for both Photinus and Renilla luciferase activities, the ratio of which is shown for each sample expressed relative to the “0 ng Tat-FLAG” sample. Columns represent the means and standard deviations of four independent experiments. (B) The same experiment as in A was performed in HeLa cells. Columns represent the means and standard deviations of three independent experiments. (C) Overexpression of PRMT6 does not alter overall plasmid expression. The Renilla luciferase activities from A were normalized to total lysate protein concentrations before being expressed relative to the “0 ng Tat-FLAG without Myc-PRMT6” sample. Samples in which Myc-PRMT6 plasmid was (+) or was not (-) cotransfected are indicated. Columns represent the means and standard deviations of four independent experiments. (D) The same determinations as in C were performed with the samples from B. Columns represent the means and standard deviations of three independent experiments.