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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Pharmacology

Background:

  • Sickle cell disease (SCD) is a genetic blood disorder caused by a mutation in the beta-globin gene, leading to abnormal hemoglobin (HbS).
  • Current therapies for SCD face limitations, highlighting the need for novel therapeutic strategies.
  • HbS polymerization in the T-state is central to SCD pathogenesis.

Purpose of the Study:

  • To investigate the potential of 5-mer cyclic peptides as inhibitors of HbS aggregation.
  • To evaluate the thermodynamic favorability of HbS dimerization upon peptide interaction.
  • To assess the specificity of cyclic peptides for the mutated Val-β6 site in HbS.

Main Methods:

  • Molecular dynamics simulations
  • Umbrella sampling techniques
  • Analysis of pocket abandonment probability and binding specificity

Main Results:

  • Blockage of the hydrophobic pocket in HbS fibers by cyclic peptides renders HbS dimerization thermodynamically unfavorable.
  • Some cyclic peptides demonstrated a 15-20% pocket abandonment probability and high specificity for the mutated Val-β6.
  • Thermodynamic unfavorability of dimerization was also achieved by blocking adjacent regions to the hydrophobic pocket.

Conclusions:

  • Certain 5-mer cyclic peptides show significant potential as antisickling drug candidates.
  • These peptides can effectively reduce the concentration of aggregation-competent HbS.
  • The findings support the development of cyclic peptides for SCD treatment by targeting HbS polymerization.