Selective and pH-Responsive Macrocyclic Anionophores.

Area of Science:

• Supramolecular Chemistry
• Chemical Biology
• Medicinal Chemistry

Background:

• Selective control of ion transport across membranes is crucial for developing therapeutics targeting diseases linked to ion transporter dysfunction.
• Synthetic ionophores offer a promising avenue for modulating membrane permeability and cellular ion homeostasis.

Purpose of the Study:

• To design and synthesize a family of C2-symmetric macrocycles as tunable synthetic ionophores.
• To investigate the structure-activity relationships governing ion transport selectivity and conditional activity.
• To explore the potential of these macrocycles as therapeutic agents with minimal cytotoxic risk.

Main Methods:

• Synthesis of C2-symmetric macrocycles derived from serine/threonine and substituted aromatic moieties.
• Modification of the aromatic core and symmetry to tune ion transport properties.
• Evaluation of anion selectivity and pH-dependent activity using biophysical techniques.

Main Results:

• Phenyl-based macrocycles demonstrated high anion selectivity and preserved vesicular pH gradients, indicating low cytotoxic potential.
• Pyridyl-containing macrocycles exhibited pH-responsive chloride transport, active only below pH 5.
• Structure-guided design enabled precise control over ionophore activity and selectivity.

Conclusions:

• A novel family of tunable and conditionally active synthetic ionophores was developed.
• These macrocycles offer a promising platform for targeted ion transport modulation in biomedical applications.
• The findings pave the way for developing safer and more effective ionophore-based therapeutics.