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Rhodomyrtone (Rom) is a membrane-active compound.

Jongkon Saising1, Minh-Thu Nguyen2, Thomas Härtner3

  • 1Microbial Genetics, Interfaculty Institute of Microbiology and Infection Medicine Tübingen (IMIT), University of Tübingen, Tübingen, Germany; School of Health Science, Mae Fah Luang University, Muang, Chiang Rai 57100, Thailand.

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Rhodomyrtone (Rom), a plant-derived antibiotic, disrupts bacterial membranes, not classical targets. It causes damage and cell death in Gram-positive bacteria and human red blood cells, offering new insights into membrane function.

Keywords:
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Area of Science:

  • Microbiology
  • Biochemistry
  • Pharmacology

Background:

  • Medicinal plants are vital in Asian traditional medicine for treating infections.
  • Rhodomyrtone (Rom), from Rhodomyrtus tomentosa, exhibits potent antimicrobial properties.
  • The precise mechanism of action for Rom remains largely unknown.

Purpose of the Study:

  • To elucidate the mode of action of rhodomyrtone (Rom) against bacteria.
  • To investigate Rom's effects on bacterial and eukaryotic cell membranes.
  • To explore Rom's potential as a tool for studying membrane physiology.

Main Methods:

  • Reporter gene assays and proteomic profiling in Bacillus subtilis.
  • Analysis of membrane potential, ATP release, and protein excretion in Staphylococcus aureus.
  • Lipid staining and studies on human erythrocytes to assess membrane damage and eryptosis.

Main Results:

  • Rom targets the cytoplasmic membrane, not traditional antibiotic pathways.
  • It rapidly reduces membrane potential, induces ATP release, and causes local membrane damage in bacteria.
  • Rom induces eryptosis in human erythrocytes, characterized by cell shrinkage and membrane scrambling.
  • Antimicrobial activity is antagonized by specific saturated fatty acids (C15:0, C16:0, C18:0).
  • Gram-negative bacteria show resistance, likely due to outer membrane barriers and LPS.

Conclusions:

  • Rhodomyrtone's primary antimicrobial mechanism involves direct damage to the cytoplasmic membrane.
  • Its effects on membrane integrity and potential make it a valuable research tool.
  • Rom's cytotoxicity and membrane-disrupting properties warrant further investigation for therapeutic and research applications.