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Published on: May 15, 2012
Rapid Solid-phase Syntheses of Peptidic-Aminoglycoside Library
Casey Kukielski1, Krishnagopal Maiti1, Sayantan Bhaduri2
1Laboratory of Medicinal Chemistry, Department of Chemistry, Clemson University, Clemson, South Carolina 29634, United States.
Tetrahedron
|August 1, 2026
Summary
Researchers synthesized novel peptidic-aminoglycosides (PAs) to combat antibiotic resistance. Neomycin-based PAs showed significant antibacterial activity, stabilizing bacterial rRNA structures more effectively than kanamycin-based PAs.
Area of Science:
- Medicinal Chemistry
- Molecular Biology
- Antimicrobial Research
Background:
- Aminoglycosides are crucial antibiotics, but resistance is a growing concern.
- Developing novel aminoglycoside derivatives is essential to overcome resistance mechanisms.
- Peptidic-aminoglycosides (PAs) offer a promising avenue for new antimicrobial agents.
Purpose of the Study:
- To synthesize and characterize a library of mono- and di-amino acid peptidic-aminoglycosides (PAs).
- To evaluate the binding stabilization of PAs to human and bacterial A-site rRNA sequences.
- To assess the antibacterial activity of synthesized PAs against Gram-negative and Gram-positive bacteria.
Main Methods:
- Solid-phase peptide synthesis was employed to create a library of over 200 PA compounds.
- Aminoglycosides (kanamycin and neomycin) were modified with fourteen L-amino acids.
- UV thermal denaturation was used to measure the stabilization of rRNA by PAs.
- Minimum inhibitory concentrations (MICs) were determined to assess antibacterial activity.
Main Results:
- A library of >200 PA compounds was rapidly synthesized with high purity (85-95%).
- Neomycin-based PAs demonstrated a wider range of rRNA stabilization (ΔTm = 2.6-17.1 °C) compared to kanamycin-based PAs (ΔTm = 0.4-4.3 °C).
- Neomycin PAs exhibited significant antibacterial activity (MIC = 2-16 μM), while kanamycin PAs showed limited activity.
Conclusions:
- The developed synthetic strategy enables rapid generation of diverse PA libraries.
- Specific amino acid sequences in PAs modulate rRNA binding and stabilization.
- Neomycin-derived PAs represent potent antibacterial agents with potential to combat resistant infections.
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