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Related Experiment Video

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pH-Dependent membrane lysis by using melittin-inspired designed peptides.

A Kashiwada1, M Mizuno, J Hashimoto

  • 1Department of Applied Molecular Chemistry, Graduate School of Industrial Technology, Nihon University, Narashino, Chiba 275-8575, Japan. kashiwada.ayumi@nihon-u.ac.jp.

Organic & Biomolecular Chemistry
|June 9, 2016
PubMed
Summary
This summary is machine-generated.

Researchers designed a pH-sensitive peptide (LPE3-1) that disrupts liposomal membranes at weakly acidic pH. This peptide shows potential for targeted drug and gene delivery systems by controlling membrane lysis.

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Area of Science:

  • Biochemistry
  • Biophysics
  • Materials Science

Background:

  • Membrane-lytic peptides (LPs) are crucial for various biological processes and therapeutic applications.
  • Controlling the activity of LPs, particularly their membrane-lytic function, is essential for targeted delivery systems.
  • Existing LPs often lack precise pH-dependent control, limiting their therapeutic specificity.

Purpose of the Study:

  • To design and synthesize a novel peptide (LPE3-1) with pH-controlled membrane-lytic activity.
  • To investigate the mechanism of pH-selective membrane disruption induced by LPE3-1.
  • To evaluate the potential of LPE3-1 for developing advanced drug and gene delivery systems.

Main Methods:

  • Synthesis of a modified membrane-lytic peptide (LPE3-1) by replacing hydrophobic residues with acidic ones.
  • Calcein leakage assays to quantify membrane disruption in liposomes at different pH values.
  • Membrane accessibility assays to assess pore formation and internal accessibility.
  • Circular dichroism spectroscopy to analyze secondary structural changes of the peptide in response to pH.

Main Results:

  • LPE3-1 exhibited significant membrane-lytic activity, including calcein leakage and membrane accessibility, specifically at weakly acidic pH (5.0).
  • At neutral pH (7.4), LPE3-1 showed minimal to no membrane disruption, indicating pH-selective activity.
  • Circular dichroism spectra confirmed that LPE3-1 adopts a helical structure in liposomes primarily under weakly acidic conditions.

Conclusions:

  • The designed peptide LPE3-1 demonstrates effective pH-dependent membrane disruption, primarily active at endosomal pH.
  • The secondary structural transition of LPE3-1's hydrophobic segment is responsible for its pH-controlled lytic activity.
  • LPE3-1 represents a promising candidate for targeted drug and gene delivery systems due to its specific membrane interaction properties.