Antibacterial Benzimidazole-2-Methanamines as Allosteric Modulators of Streptococcus pneumoniae Penicillin-Binding...

Area of Science:

• Medicinal Chemistry
• Microbiology
• Drug Discovery

Background:

• Penicillin-binding protein 2x (PBP2x) is crucial for Streptococcus pneumoniae cell-wall biosynthesis.
• Developing novel antibiotics against resistant bacterial strains is a global health priority.

Purpose of the Study:

• To identify novel inhibitors of PBP2x through virtual screening.
• To develop potent bactericidal compounds against Streptococcus pneumoniae.

Main Methods:

• Virtual screening of over 2 million compounds to identify PBP2x allosteric site inhibitors.
• Structure-activity relationship studies involving 96 synthesized analogs.
• Minimal inhibitory concentration (MIC) determination and broad-spectrum bactericidal testing against clinical isolates.

Main Results:

• A benzimidazole-2-methanamine derivative was identified as a promising hit.
• Optimization led to analogs with significantly reduced MIC values (≤4 mg·L⁻¹).
• The developed compounds demonstrated broad-based bactericidal growth inhibition against 31 clinical strains of S. pneumoniae.

Conclusions:

• Novel benzimidazole-2-methanamine analogs are effective inhibitors of PBP2x.
• These compounds exhibit potent bactericidal activity against clinical isolates of S. pneumoniae.
• The findings present a promising new avenue for developing antibiotics against pneumococcal infections.