2. Academic Validation
  3. Phenyl urea based adjuvants for β-lactam antibiotics against methicillin resistant Staphylococcus aureus

Phenyl urea based adjuvants for β-lactam antibiotics against methicillin resistant Staphylococcus aureus

  • Bioorg Med Chem Lett. 2025 Jun 1:121:130164. doi: 10.1016/j.bmcl.2025.130164.
Hailey S Butman 1,  Monica A Stefaniak 1,  Danica J Walsh 1,  Vijay S Gondil 2,  Mikaeel Young 2,  Andrew H Crow 1,  Ansley M Nemeth 1,  Roberta J Melander 1,  Paul M Dunman 3,  Christian Melander 4
Affiliations

Affiliations

  • 1 Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN, 46556, United States.
  • 2 Department of Microbiology and Immunology, University of Rochester Medical Center, Rochester, New York 14642, United States.
  • 3 Department of Microbiology and Immunology, University of Rochester Medical Center, Rochester, New York 14642, United States. Electronic address: paul_dunman@urmc.rochester.edu.
  • 4 Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN, 46556, United States. Electronic address: cmelande@nd.edu.
PMID: 40043820 DOI: 10.1016/j.bmcl.2025.130164
Abstract

Penicillin binding protein 4 (PBP4) is essential for Staphylococcus aureus cortical bone osteocyte lacuno-canalicular network (OLCN) invasion, which causes osteomyelitis and serves as a Bacterial niche for recurring bone Infection. Moreover, PBP4 is also a key determinant of S. aureus resistance to fifth-generation cephalosporins (ceftobiprole and ceftaroline). From these perspectives, the development of S. aureus PBP4 inhibitors may represent dual functional therapeutics that prevent osteomyelitis, and reverse PBP4-mediated β-lactam resistance. A high-throughput screen for small molecules that inhibit S. aureus PBP4 function identified compound 1. We recently described a preliminary structure activity relationship (SAR) study on 1, identifying several compounds with increased PBP4 inhibitory activity, some of which also inhibit PBP2a. Herein, we expand our exploration of phenyl ureas as Antibiotic adjuvants, investigating their activity with penicillins and additional cephalosporins against PBP2a-mediated methicillin-resistant S. aureus (MRSA). We screened the previously reported pilot library, and prepared an additional series of phenyl ureas based on compound 1. Lead compounds potentiate multiple β-lactam Antibiotics, lowering minimum inhibitory concentrations (MICs) below susceptibility breakpoints, with up to 64-fold reductions in MIC.

Keywords

Adjuvant; Antibiotic resistance; Methicillin-resistant Staphylococcus aureus; Phenyl urea; β-Lactam.

Figures
Products