Discovery of potent ClpX modulators with pronounced antibacterial activity against methicillin-resistant...

Area of Science:

• Microbiology
• Medicinal Chemistry
• Drug Discovery

Background:

• Invasive methicillin-resistant Staphylococcus aureus (MRSA) infections present significant morbidity and mortality.
• Targeting essential bacterial proteins like ClpX offers a promising strategy for novel antibiotic development against MRSA.

Purpose of the Study:

• To identify and develop novel modulators of Staphylococcus aureus ClpX (SaClpX) for combating MRSA infections.
• To evaluate the antibacterial activity, resistance potential, and in vivo efficacy of identified compounds.

Main Methods:

• Screening of an in-house compound library to identify SaClpX inhibitors.
• Chemical optimization of lead compounds to enhance antibacterial potency and reduce resistance.
• In vitro and in vivo evaluation of compound efficacy, safety, and pharmacokinetic properties.

Main Results:

• PFK-158 identified as a high-affinity SaClpX inhibitor with potent MRSA activity.
• Optimized α, β-unsaturated ketone derivative demonstrated enhanced MRSA activity and reduced resistance potential.
• The novel compound exhibited favorable oral bioavailability and therapeutic effects in a MRSA skin abscess model.

Conclusions:

• A novel SaClpX modulator was developed with significant potential against Staphylococcus infections.
• The findings support Staphylococcus aureus ClpX as a viable target for developing new antibiotics.
• This study presents a promising strategy for the rational design of specific SaClpX modulators.