Aprosamine Derivatives Active against Multidrug-Resistant Gram-Negative Bacteria

Area of Science:

• Medicinal Chemistry
• Microbiology
• Antibiotic Resistance

Background:

• Multidrug-resistant (MDR) Gram-negative bacteria pose a significant global health threat.
• Existing antibiotics are increasingly ineffective against MDR pathogens.
• Aminoglycoside antibiotics are crucial, but resistance mechanisms are evolving.

Purpose of the Study:

• To synthesize novel aprosamine derivatives as potential aminoglycoside antibiotics.
• To evaluate the antibacterial activity of these derivatives against MDR Gram-negative bacteria.
• To identify structural modifications that enhance efficacy and overcome resistance.

Main Methods:

• Chemical synthesis of aprosamine derivatives with modifications at C-8' and the 2-deoxystreptamine moiety.
• Glycosylation at the C-8' position.
• Epimerization, deoxygenation at C-5, and N-acylation at C-1.

Main Results:

• 8'-β-glycosylated aprosamine derivatives demonstrated excellent activity against carbapenem-resistant Enterobacteriaceae and 16S ribosomal RNA methyltransferase-producing bacteria.
• 5-epi and 5-deoxy derivatives showed further enhanced antibacterial activity.
• Derivatives acylated with (S)-4-amino-2-hydroxybutyric acid were highly effective against bacteria producing aminoglycoside 3-N-acetyltransferase IV, overcoming apramycin resistance.

Conclusions:

• Aprosamine derivatives exhibit significant potential as therapeutic agents against MDR Gram-negative bacteria.
• Specific modifications, such as 5-epi and 5-deoxy substitutions, enhance potency.
• These novel compounds offer a promising avenue for combating challenging bacterial infections.