Screening of anti-Acinetobacter baumannii phytochemicals, based on the potential inhibitory effect on OmpA and OmpW...

Area of Science:

• Microbiology
• Computational Chemistry
• Pharmacology

Background:

• Multi-drug-resistant *Acinetobacter baumannii* poses a significant therapeutic challenge, with current antibiotics proving ineffective.
• Outer membrane proteins A (OmpA) and W (OmpW) are crucial for bacterial function and represent potential drug targets.
• Natural compounds offer a promising avenue for discovering novel antibacterial agents.

Purpose of the Study:

• To screen a library of 384 phytochemicals for drug-like properties and inhibitory potential against *A. baumannii* OmpA and OmpW.
• To identify natural compounds capable of blocking the function of OmpA and OmpW to attenuate bacterial growth.
• To evaluate the binding affinity and stability of selected phytochemicals with OmpA and OmpW.

Main Methods:

• Phytochemical library screening based on ADMET (absorption, distribution, metabolism, excretion, and toxicity) properties.
• Molecular docking calculations against predicted 3D structures of *A. baumannii* OmpA and OmpW.
• Molecular dynamics simulations to confirm the stability of phytochemical-protein complexes.

Main Results:

• Three phytochemicals, isosakuranetin, aloe-emodin, and pinocembrin, exhibited significant binding affinity to OmpA and OmpW.
• Molecular dynamics simulations validated the stability of the identified phytochemical-protein complexes.
• Isosakuranetin emerged as the most promising compound for further investigation.

Conclusions:

• Phytochemicals can be effectively screened for their potential to inhibit essential bacterial proteins like OmpA and OmpW.
• Isosakuranetin demonstrates significant potential as a lead compound for developing new therapies against *Acinetobacter baumannii*.
• Further *in vitro* and *in vivo* studies are warranted to validate the therapeutic efficacy of isosakuranetin.