Additional file 1. Rescue of Vif-deficient FIV and Bet-deficient FFV by FIV Vif and FFV Bet. A Vif-deficient FIV plasmid DNA was co-transfected with plasmids expressing FIV Vif or FFV Bet together with different feA3 restriction factors as given in the legend (left panel). Empty vector pcDNA3.1 served as control. Two days after transfection, cell-free supernatants were used to infect FIV reporter cells and luc activity induced by FIV infection was measured two days p.i. Titers are expressed as luc values of a representative experiment. B The Bet-deficient FFV genome pCF7-BBtr was co-transfected with plasmids expressing untagged and V5-tagged FFV Bet or two different amounts of FIV Vif expression plasmid together with the major FFV-restricting feA3Z2b-HA as shown below the bar diagram (right panel). Empty vector pcDNA3.1 served as control. Two days after transfection, cell-free supernatants were titrated in triplicate using FFV reporter cells as described in the “Methods” section and are expressed as focus-forming units (FFU) per ml inoculum of a representative experiment. Error bars represent the standard deviation
