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Aromatic Pentaamide Macrocycles as High-Affinity Sulfate Binders and Efficient Transporters
Danbo Wang1, Yulong Zhong1, Christina T Scalzo1
1Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York, 14260, USA.
Researchers developed novel macrocycles (c5) that effectively bind and transport the challenging sulfate ion. These synthetic receptors demonstrate high affinities and facilitate transport across membranes, offering broad applicability.
Area of Science:
- Chemical Biology
- Supramolecular Chemistry
- Membrane Transport
Background:
- Sulfate ion binding and transport are critical yet challenging due to its high hydrophilicity.
- Existing receptors for sulfate are scarce, limiting applications in biological and chemical systems.
Purpose of the Study:
- To design and synthesize novel macrocyclic receptors (c5) for efficient sulfate binding and transport.
- To investigate the binding affinities and transport capabilities of c5 macrocycles in various media.
Main Methods:
- Synthesis of macrocycles c5 with a constrained aromatic amide backbone.
- Spectroscopic and binding studies to determine sulfate binding affinities (Ka).
- Transport assays across bulk organic phases and lipid bilayers.
Main Results:
- Macrocycles c5 exhibit strong sulfate binding (108–1013 M-1) through a preorganized electropositive cavity.
- Water-soluble c5c forms a 4:1 complex with sulfate in aqueous solution.
- Hydrophobic c5a and c5b effectively mediate sulfate transport across chloroform and lipid bilayers.
Conclusions:
- Macrocycles c5 represent a versatile platform for sulfate recognition and transport.
- Synthetic tunability allows tailoring c5 receptors for diverse environmental conditions.
- These findings offer potential for developing new tools in chemical sensing and drug delivery.
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