Fig. 5.
Inhibition of MPERp-induced vesicle contents leakage by 4E10. A) Effect of antibody addition to the ongoing leakage. POPC:Chol (2:1, molar ratio) vesicle samples (100 μM lipid) were treated with 1 μM peptide and, subsequently supplemented with 10 μg/ml of 4E10 (addition time indicated by the arrow). The dotted traces follow the leakage kinetics in the absence of antibody. B) 4E10-induced inhibition percentages plotted as a function of the Chol mole fraction. Rate reduction caused by antibody with respect to the leakage control without antibody was calculated by correcting 0% extent of leakage to the time point of antibody addition, and subsequently measuring increment of leakage after 20 s in both samples. C) Peptide mass percentage distribution between the monolayer slabs under the experimental conditions used for X-ray scattering assays (indicated by the arrows in the previous panel). Preferential location of the peptide into the HG slab correlates with better 4E10 epitope recognition-blocking.