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Related Experiment Videos

Pseudomonas exotoxin A. Membrane binding, insertion, and traversal.

Z T Farahbakhsh, R L Baldwin, B J Wisnieski

    The Journal of Biological Chemistry
    |August 25, 1986
    PubMed
    Summary

    Pseudomonas aeruginosa exotoxin A (PTx) binding and insertion into lipid vesicles are influenced by pH, ionic strength, and temperature. Acidic conditions and specific vesicle compositions optimize PTx entry, which is triggered by conformational changes.

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Membrane Biophysics

    Background:

    • Pseudomonas aeruginosa exotoxin A (PTx) is a potent toxin that enters host cells.
    • Understanding PTx interaction with lipid bilayers is crucial for developing therapeutic strategies.

    Purpose of the Study:

    • To investigate the environmental and lipid composition factors influencing PTx binding and insertion into vesicles.
    • To elucidate the mechanism of PTx entry into lipid bilayers.

    Main Methods:

    • Utilized phosphatidylcholine:cholesterol vesicles (1:1 molar ratio) as targets.
    • Assessed PTx binding and insertion using photolabeling with an intramembranous probe.
    • Varied pH, ionic strength (NaCl concentration), temperature, and vesicle lipid composition (dicetylphosphate, stearylamine).

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    Main Results:

    • PTx binding and insertion are optimal at acidic pH (4) and high ionic strength (150-200 mM NaCl).
    • Vesicles containing dicetylphosphate enhanced PTx binding and insertion compared to neutral or positively charged vesicles.
    • Increased temperature accelerated bilayer translocation, reducing photolabeling accessibility, and trypsin cleavage confirmed acid-induced insertion.

    Conclusions:

    • PTx entry into lipid bilayers is triggered by an acid-induced conformational change.
    • Optimal binding and insertion depend on specific pH, ionic strength, and vesicle lipid composition.
    • Membrane traversal kinetics post-insertion are modulated by bilayer physical properties.