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Highly potential antiplasmodial restricted peptides.

Torres Marcelo Der Torossian1, Adriana F Silva, Flávio L Alves

  • 1Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André, Brazil.

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Area of Science:

  • Medicinal Chemistry
  • Parasitology
  • Biochemistry

Background:

  • Malaria causes approximately one million deaths annually.
  • Angiotensin II and its analogs show potential antimalarial effects.
  • Developing new antimalarial agents is crucial.

Purpose of the Study:

  • To synthesize and evaluate angiotensin II analogs with disulfide bridges for antiplasmodial activity.
  • To investigate the impact of structural modifications on bioactivity.
  • To explore new therapeutic strategies against malaria.

Main Methods:

  • Synthesis of five angiotensin II analogs using Fmoc solid-phase peptide synthesis.
  • Purification by liquid chromatography and characterization by mass spectrometry.
  • Conformational analysis using circular dichroism and antiplasmodial activity assessment via fluorescence microscopy.

Main Results:

  • Two synthesized analogs exhibited enhanced antiplasmodial activity (92% and 98%) compared to angiotensin II (88%).
  • The position of inserted cysteine residues significantly influenced antiplasmodial activity.
  • Circular dichroism indicated a conserved β-turn conformation in active analogs and native angiotensin II.

Conclusions:

  • Structural restriction via disulfide bridges can enhance the antiplasmodial activity of angiotensin II analogs.
  • Strategic placement of amino acid insertions is critical for maintaining activity.
  • These findings provide a basis for designing novel chemotherapeutic agents for malaria.