Antibacterial 5'-O-(N-dipeptidyl)-sulfamoyladenosines.

Area of Science:

• Medicinal Chemistry
• Antimicrobial Drug Discovery
• Enzyme Inhibition

Background:

• Aminoacyl-tRNA synthetases (aaRS) are validated antimicrobial targets.
• Existing aaRS inhibitors (aminoacyl sulfamoyladenosines) exhibit limited whole-cell antibacterial activity due to poor bacterial penetration.
• Improved bacterial entry is crucial for developing effective aaRS-targeting antimicrobials.

Purpose of the Study:

• To develop novel dipeptidyl derivatives of 5'-O-(N-L-aminoacyl)-sulfamoyladenosines.
• To enhance bacterial penetration and whole-cell antibacterial activity of aaRS inhibitors.
• To evaluate the antibacterial efficacy and spectrum of new derivatives against Gram-positive and Gram-negative bacteria.

Main Methods:

• A novel, concise synthetic route was employed to prepare 18 distinct 5'-O-(N-dipeptidyl)-sulfamoyladenosine derivatives.
• Antibacterial activity assays were conducted against Staphylococcus aureus, Enterococcus faecalis, and Escherichia coli.
• Comparative analysis with reference compounds was performed to assess efficacy and spectrum.

Main Results:

• Several newly synthesized dipeptidyl derivatives demonstrated enhanced antibacterial activity compared to parent compounds.
• The modified compounds exhibited an altered spectrum of antibacterial activity.
• The dipeptidyl modification strategy appears to improve bacterial penetration.

Conclusions:

• Dipeptidyl modification of 5'-O-(N-L-aminoacyl)-sulfamoyladenosines is a viable strategy to overcome bacterial penetration limitations.
• These novel derivatives represent promising candidates for further development as antimicrobial agents targeting aaRS.
• The findings support the continued exploration of aaRS inhibitors with improved pharmacokinetic properties.