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- W1887129968 abstract "The cationic staphylococcinlike peptide Pep 5 is shown to depolarize bacterial and planar lipid membranes in a voltage-dependent manner. An artificial valinomycin-induced potassium diffusion potential across the cytoplasmic membrane of Staphylococcus cohnii 22 was sufficient to promote Pep 5 action. Thus, evidence is provided that a membrane potential of sufficient magnitude is the only prerequisite for Pep 5 activity. The voltage dependence was elucidated by macroscopic conductance measurements with black lipid membranes. A threshold potential of about -90 to -100 mV, which was deduced from experiments with bacterial cells, could be confirmed. Single pores were resolved which often occur as short-lived bursts and fluctuate among different conductance levels. Pore diameters were calculated ranging from 0.1 to 1 nm. Succinylation of the lysine residues of Pep 5 resulted in prolonged pore lifetimes and maintenance of distinct conductance levels. However, the succinylated peptide required a higher threshold potential, approximately -150 mV, than the native peptide, which is probably the reason for the reduced activity of the modified peptide against intact gram-positive bacteria." @default.
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- W1887129968 date "1988-01-01" @default.
- W1887129968 modified "2023-10-11" @default.
- W1887129968 title "Mode of action of the staphylococcinlike peptide Pep 5: voltage-dependent depolarization of bacterial and artificial membranes" @default.
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- W1887129968 doi "https://doi.org/10.1128/jb.170.1.84-88.1988" @default.
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