Molecular hybridization strategy for tuning bioactive peptide function

Area of Science:

• Biochemistry
• Medicinal Chemistry
• Molecular Biology

Background:

• Antimicrobial peptides (AMPs) are crucial for innate immunity but often exhibit toxicity, limiting therapeutic applications.
• Modifying physicochemical properties of AMPs can potentially reduce toxicity while enhancing antimicrobial efficacy.
• Developing safer and more effective antimicrobial agents remains a significant challenge in medicine.

Purpose of the Study:

• To design and synthesize novel hybrid antimicrobial peptides (hAMPs) by combining sequences from different natural peptides.
• To evaluate the antimicrobial activity, antiplasmodial effects, and human cell toxicity of the designed hAMPs.
• To demonstrate the efficacy of peptide hybridization as a strategy for creating improved bioactive molecules.

Main Methods:

• Hybridization of peptide sequences from the toxic VmCT1 peptide with four other naturally occurring antimicrobial peptides.
• Generation of seven synthetic bioactive variants (hAMPs).
• Assessment of antimicrobial activity (3.1-128 μmol L⁻¹) and antiplasmodial activity (0.8 μmol L⁻¹) against red blood cells.

Main Results:

• All seven designed hAMPs maintained their structural integrity.
• The synthetic variants exhibited significantly increased antimicrobial activity.
• Five hAMPs showed potent antiplasmodial activity with minimal toxicity to red blood cells.

Conclusions:

• Peptide hybridization is an effective strategy for generating novel bioactive molecules with improved properties.
• This approach successfully reduced toxicity while enhancing both antimicrobial and antiplasmodial activities.
• The developed hAMPs represent promising candidates for future therapeutic development against microbial infections and malaria.