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Related Experiment Video

Updated: Dec 23, 2025

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Glycosphingolipids Recognized by Acinetobacter baumannii.

Miralda Madar Johansson1, Mehjar Azzouz1, Beatrice Häggendal1

  • 1Institute of Biomedicine, Department of Medical Biochemistry and Cell Biology, Sahlgrenska Academy, University of Gothenburg, SE40530 Göteborg, Sweden.

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|April 29, 2020
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Summary

Acinetobacter baumannii binds to specific glycosphingolipids, identifying neolactotetraosylceramide on human skin as a potential receptor. This finding advances understanding of hospital-acquired infections and bacterial adhesion mechanisms.

Keywords:
Acinetobacter baumanniiglycosphingolipid structurehuman skin glycosphingolipidsmass spectrometrymicrobial adhesion

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Area of Science:

  • Microbiology
  • Glycobiology
  • Infectious Diseases

Background:

  • Acinetobacter baumannii is a significant cause of hospital-acquired infections.
  • Bacterial adhesion to host cells is critical for colonization and infection.
  • Host cell surface carbohydrates, particularly glycosphingolipids, can act as microbial receptors.

Purpose of the Study:

  • To identify potential glycosphingolipid receptors for Acinetobacter baumannii.
  • To investigate the role of specific carbohydrate structures in bacterial adhesion.

Main Methods:

  • Binding assays using 35S-labeled Acinetobacter baumannii and glycosphingolipids on thin-layer chromatograms.
  • Isolation and identification of binding-active glycosphingolipids using mass spectrometry.
  • Characterization of glycosphingolipids from human skin.

Main Results:

  • Acinetobacter baumannii selectively bound to neolactotetraosylceramide and lactotetraosylceramide from human and rabbit small intestine.
  • N-acetylglucosamine (GlcNAc) was identified as the basic recognized element.
  • Neolactotetraosylceramide was detected in human skin, a known target tissue for A. baumannii.

Conclusions:

  • Neolactotetraosylceramide and lactotetraosylceramide are potential glycosphingolipid receptors for Acinetobacter baumannii.
  • The N-acetylglucosamine moiety is crucial for A. baumannii recognition.
  • The presence of neolactotetraosylceramide on human skin suggests its role in A. baumannii colonization and infection.