SUMO1 and infection: Totest if overexpression of SUMO-1 in other more restrictive human cells couldenhance the restriction to N-MLV, we transduced TE671 cells with retroviralvectors encoding HA-SUMO-1 used above, and confirmed expression by Western blot(Figure 2A).Overexpression of SUMO-1 in TE671 cells reduced infection of N-MLV by an averageof 3 fold as compared to the empty vector cell line (Figure 2C).