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Eugenol targeting CrtM inhibits the biosynthesis of staphyloxanthin in Staphylococcus aureus

Jiang Changa, Bo Chena, Zeqian Dub, Bowen Zhaob, Jiahui Lia, Ziyi Lia, Kannappan Arunachalama, Ting Shib, Dongqing Weib, Chunlei Shia()
MOST-USDA Joint Research Center for Food Safety, School of Agriculture and Biology, State Key Laboratory of Microbial Metabolism, Shanghai Jiao Tong University, Shanghai 200240, China
School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China

Peer review under responsibility of Tsinghua University Press.

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Highlights

• Virtual screening was an effective measure to screen staphyloxanthin inhibitor.

• Eugenol inhibited staphyloxanthin biosynthesis without affecting S. aureus growth.

• The resistance of S. aureus to ROS decreased significantly under eugenol treatment.

• Eugenol might mainly target CrtM to block staphyloxanthin production.

Abstract

Staphylococcus aureus is a serious foodborne pathogen threatening food safety and public health. Especially the emergence of methicillin-resistant Staphylococcus aureus (MRSA) increased the diff iculty of S. aureus treatment. Staphyloxanthin is a crucial virulence factor of S. aureus. Blocking staphyloxanthin production could help the host immune system counteract the invading S. aureus cells. In this study, we first screened for staphyloxanthin inhibitors using a virtual screening method. The outcome of the virtual screening method resulted in the identification of eugenol (300 μg/mL), which significantly inhibits the staphyloxanthin production in S. aureus ATCC 29213, S. aureus Newman, MRSA ATCC 43300 and MRSA ATCC BAA1717 by 84.2%, 63.5%, 68.1%, and 79.5%, respectively. The outcome of the growth curve assay, f ield-emission scanning electron, and confocal laser scanning microscopy analyses confirmed that eugenol at the test concentration did not affect the morphology and growth of S. aureus. Moreover, the survival rate of S. aureus ATCC 29213 and MRSA ATCC 43300 under H2O2 pressure decreased to 51.9% and 45.5% in the presence of eugenol, respectively. The quantitative RT-PCR and molecular simulation studies revealed that eugenol targets staphyloxanthin biosynthesis by downregulating the transcription of the crtM gene and inhibiting the activity of the CrtM enzyme. Taken together, we first determined that eugenol was a prominent compound for staphyloxanthin inhibitor to combat S. aureus especially MRSA infections.

Keywords

Staphylococcus aureusStaphyloxanthinEugenolVirtual screening4,4’-Diapophytoene synthase (CrtM)

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Food Science and Human Wellness
Volume 13 Issue 3,
May 2024
Pages 1368-1377
DOI: 10.26599/FSHW.2022.9250115
Cite this article:
Chang J, Chen B, Du Z, et al. Eugenol targeting CrtM inhibits the biosynthesis of staphyloxanthin in Staphylococcus aureus. Food Science and Human Wellness, 2024, 13(3): 1368-1377. https://doi.org/10.26599/FSHW.2022.9250115
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