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Submitted: 16 Nov 2020
Accepted: 28 Feb 2021
ePublished: 30 Mar 2021
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Avicenna J Clin Microbiol Infect. 2021;8(1): 27-33.
doi: 10.34172/ajcmi.2021.06
  Abstract View: 157
  PDF Download: 114

Original Article

Evaluation of the Antibacterial and Investigation of the Molecular Docking of New Derivatives of 1, 3, 4-Oxadiazole as Inhibitors of Quorum Sensing System in the Human Pathogen Pseudomonas Aeruginosa

Sepideh Ghameshlouei 1 ORCID logo, Nakisa Zarrabi Ahrabi 1 ORCID logo, Ali Souldozi 2 ORCID logo, Yasin SarveAhrabi 1* ORCID logo

1 Department of Biology, Central Tehran Branch, Islamic Azad University, Tehran, Iran
2 Department of chemistry, Urmia Branch, Islamic Azad University, Urmia, Iran
*Corresponding author: Yasin SarveAhrabi, PhD in Microbiology, Department of Biology, Central Tehran Branch, Islamic Azad University, Tehran, Iran, Tel: +989141483263, Email: yasin.ahrabi2016@ gmail.com

Abstract

Background: Oxadiazoles are a group of anti-inflammatory compounds that have a wide range of activity due to their higher efficacy. Pseudomonas aeruginosa is an opportunistic pathogen and a major pathogen of nosocomial infections. This study aimed to evaluate the antibacterial and investigation of the molecular docking of new derivatives of 1, 3, 4-oxadiazole against P. aeruginosa, in vitro & in silico.

Materials and Methods: Four new derivatives were synthesized and added to our previous synthetic derivatives of 1, 3, 4-oxadiazole. The antibacterial activity of all derivatives was measured based on three standard species of P. aeruginosa using inhibition zone (IZ) and minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) methods. Then, employing the computational design of the drug by the molecular docking method, the inhibitory effect of synthetic compounds on the LasR regulatory protein of P. aeruginosa quorum sensing system was investigated, which plays an important role in regulating the expression of pathogenic genes in bacteria.

Results: The chemical structures of new compounds were characterized by IR spectra and 1H-NMR. A variety of inhibitory effects were observed by the synthesized compounds – compound 4d and 4g, in particular. Also, the inhibitory effect of these two compounds on the LasR regulatory protein under the control of the quorum sensing system in P. aeruginosa was demonstrated by molecular docking.

Conclusions: The results of this study showed that the two compounds containing the functional group of naphthalene and fluorophenyl have a significant effect on the inhibition of P. aeruginosa, as well as on the LasR protein of this bacterium.

Keywords: Oxadiazoles, Antibacterial, Molecular docking, Fluorophenyl, Naphthalene
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