HIV-1 MA-RNA electrophoretic mobility assays were performed as described in Figure 2 to monitor free (F) and MA-bound (B) Sel15 RNA oligonucleotide. In the lefthand lane, MA (15 µM) was preincubated with DMSO prior to the RNA (15 µM) binding incubation. In the righthand lanes, MA was preincubated with 50 µM 81047 alone (second lane from the left), or 50 µM 81047 plus 200 µM glutathione (GSH), cysteine (Cys), β-mercaptoethanol (βME), dithiothreitol (DTT) or Tris(2-carboxyethyl)phosphine hydrochloride (TCEP).