In-Vitro Evaluation of Biological Activity of New Series of 1, 3, 4-Oxadiazole Derivatives Against Bap Gene Expression in Acinetobacter baumannii Biofilm

Background: Acinetobacter baumannii is one of the most common opportunistic pathogens in health centers that is resistant to many antibiotics due to biofilm production. 1, 3, 4-oxadiazoles have a wide range of biological activities. Objectives: The aim of this research was to examine the impact of new 1, 3, 4-oxadiazole derivatives on the expression of biofilm-associated surface protein (Bap), playing an important role in promoting the biofilm formation ability of A. baumannii strains. Methods: Derivatives of 1, 3, 4-oxadiazole were synthesized through a one-step synthesis. Acinetobacter baumannii strains were identified and isolated in the laboratory. The antimicrobial properties of the synthesized materials against the isolated strains were investigated. DNA, RNA, and cDNA were extracted, and the relative expression of BAP gene in A. baumannii isolates was evaluated by real-time polymerase chain reaction. Results: The compound with methoxyphenyl functional group with MIC = 62.50 mg/mL had the best inhibitory performance among all derivatives. Also, the combination of 4i reduced the expression of the Bap gene by about 24 times, but it had no effect on the expression of the 16srRNA housekeeping gene. Conclusions: 1, 3, 4-oxadiazole derivatives, especially the methoxyphenyl functional group, act as an inhibitor of bacterial biofilm formation and have the potential to be used in the pharmaceutical and biological industries