Synthesis and antibacterial activities of novel pleuromutilin derivatives with a substituted pyrimidine moiety

Area of Science:

• Medicinal Chemistry
• Microbiology
• Drug Discovery

Background:

• Rising prevalence of multidrug-resistant bacteria, including MRSA and VRE, poses a significant global health threat.
• Urgent need for novel antibiotics with unique mechanisms of action to combat resistant infections.

Purpose of the Study:

• To design, synthesize, and evaluate novel pleuromutilin derivatives featuring substituted 6-amino pyrimidine moieties.
• To identify potent antibacterial agents against resistant bacterial strains, particularly MRSA.

Main Methods:

• Synthesis of a series of novel pleuromutilin derivatives.
• In vitro antibacterial activity testing against MRSA and S. aureus.
• Molecular docking studies on the peptidyl transferase center (PTC) of 23S rRNA.
• In vivo efficacy studies in a mouse systemic infection model.

Main Results:

• Several synthesized compounds exhibited high potency against MRSA and S. aureus.
• Compounds 3 and 5h were identified as the most active derivatives.
• Compound 3 demonstrated rapid bactericidal activity and therapeutic efficacy in vivo (ED50 = 4.22 mg/kg).
• Docking studies provided insights into the binding models of compounds 3 and 5h.

Conclusions:

• Novel pleuromutilin derivatives with substituted 6-amino pyrimidine moieties show promising antibacterial activity against MRSA.
• Compounds 3 and 5h represent potential lead candidates for developing new anti-MRSA therapeutics.
• Further investigation into their mechanism of action and therapeutic potential is warranted.