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Synthesis and Biological Evaluation of C6-O-Glycosylated α-Mangostin Derivatives Against Methicillin-Resistant

Wenchong Ye1, Chuangchuang Fan1, Tiantian Zhou1

  • 1Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, China.

Chemmedchem
|July 6, 2026
PubMed

Insights

Researchers developed new glycosylated compounds derived from alpha-mangostin to combat MRSA infections. One derivative, Y-3, shows potent antibacterial activity and improved safety, demonstrating promise for topical MRSA treatments.

Area of Science:

  • Medicinal Chemistry
  • Antimicrobial Drug Discovery
  • Natural Product Derivatives

Background:

  • Methicillin-resistant Staphylococcus aureus (MRSA) is a significant global health concern, necessitating novel antibacterial agents.
  • Natural xanthone alpha-mangostin (α-MG) exhibits potent anti-MRSA activity but is limited by hydrophobicity and hemolytic toxicity.
  • Developing derivatives with improved selectivity and reduced host toxicity is crucial for therapeutic application.

Purpose of the Study:

  • To design and synthesize C6-O-glycosylated α-MG derivatives to enhance amphiphilicity and bacterial-versus-host selectivity.
  • To evaluate the antibacterial efficacy, hemolytic activity, and mechanism of action of these novel compounds against MRSA.
  • To assess the therapeutic potential of the lead compound in a preclinical MRSA wound infection model.

Main Methods:

  • Synthesis of a focused series of C6-O-glycosylated α-MG derivatives (Y-1-Y-15) with diverse saccharides.
  • Determination of minimum inhibitory concentrations (MIC) against S. aureus and MRSA, and hemolytic concentrations (HC50).
  • Mechanistic studies involving membrane permeabilization, depolarization assays, and phospholipid antagonism experiments.
  • In vivo efficacy testing in a murine MRSA wound infection model.

Main Results:

  • The L-gulose conjugate Y-3 demonstrated potent activity against both methicillin-susceptible S. aureus and MRSA (MIC = 2 μg/mL).
  • Y-3 exhibited significantly reduced red blood cell lysis (HC50 = 48.20 μg/mL) and an improved selectivity index (SI = 24.10) compared to α-MG.
  • Mechanistic studies indicated Y-3 rapidly permeabilizes and depolarizes bacterial membranes, with preferential interaction towards anionic bacterial lipids.
  • Topical application of Y-3 in a murine MRSA wound model accelerated healing and reduced bacterial burden.

Conclusions:

  • C6 glycosylation is an effective strategy to decouple the potent antibacterial activity of α-MG from host membrane toxicity.
  • The derivative Y-3 shows promising characteristics as a lead compound for the development of topical anti-MRSA therapeutics.
  • Further investigation into Y-3 is warranted for its potential in combating challenging MRSA infections.
Keywords:
cardiolipinglycosylationmembrane disruptionmethicillin‐resistant Staphylococcus aureusα‐mangostin

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