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Low-pH-dependent fusion of PE2 cleavage-deficient SIN viruses with liposomes. On-line fusion experiments were performed as described in the legend to Fig. 2. (A) Time course of fusion at pH 5.0. Curve a, E2:N1/T191; curve b, TR339; curve c, E2:N1; curve d, FDF. (B) The extent of fusion at different pHs was determined 60 s after acidification. ■, TR339; ▴, E2:N1/T191; ▾, E2:N1/G216; ●, E2:N1; ⧫, FDF.
