Journal
BIOORGANIC & MEDICINAL CHEMISTRY
Volume 67, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.bmc.2022.116819
Keywords
Photoaffinity labeling; Salicylanilide compound; Peptidoglycan; Molecular docking; Antibacterial agent
Funding
- Academia Sinica [AS-SUMMIT-109]
- Ministry of Science and Technology [MOST 109-0210-01-18-02, MOST 109-2113-M-002-009]
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A benzophenone-containing salicylanilide compound was synthesized and used as a photoaffinity probe to identify the binding site of Acinetobacter baumannii penicillin-binding protein. Molecular docking experiments suggested that the binding site is a hydrophobic pocket that can disrupt the growth of peptidoglycan chain.
A series of salicylanilide compounds was previously identified as antibacterial agents that inhibit the peptidoglycan formation. To find the exact binding mode, we synthesized a benzophenone-containing salicylanilide compound (1) and used it as a photoaffinity probe to label Acinetobacter baumannii penicillin-binding protein (PBP1b). After incubation and photo-irradiation, the labeled protein was subjected to trypsin digestion, dialysis enrichment, LC-ESI-MS/MS analysis, and Mascot search to reveal an octadecapeptide sequence 364RQLRTEYQESDLTNQGLR381 that was labeled at E372. Our molecular docking experiments suggest a hydrophobic pocket surrounded by R367 and E372 is the binding site of salicylanilide 1. The pocket lies in between the transglycosylase and transpeptidase domains, thus binding of salicylanilide 1 can block the propagation pathway to disrupt the growth of peptidoglycan chain.
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