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Antibacterial membrane attack by a pore-forming intestinal C-type lectin.

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Area of Science:

  • Microbiology
  • Immunology
  • Structural Biology

Background:

  • Epithelial surfaces host bacterial communities, necessitating defense by antibacterial proteins.
  • RegIII C-type lectins are crucial for intestinal homeostasis, preventing direct bacterial contact with the epithelium.
  • The precise bactericidal mechanism of RegIII lectins remained unelucidated.

Purpose of the Study:

  • To elucidate the molecular mechanism underlying the bactericidal activity of RegIII lectins.
  • To investigate the structural basis of RegIII pore formation and bacterial killing.

Main Methods:

  • Utilized structural biology techniques, including X-ray crystallography and cryo-electron microscopy.
  • Developed a three-dimensional model of the RegIIIα pore complex.
  • Performed experiments to validate the functional properties of the RegIIIα pore.

Main Results:

  • Human RegIIIα (HIP/PAP) kills bacteria by forming a hexameric, membrane-permeabilizing pore.
  • The RegIIIα pore targets bacterial membrane phospholipids.
  • Lipopolysaccharide (LPS) inhibits RegIIIα pore formation, explaining its specificity for Gram-positive bacteria.

Conclusions:

  • RegIII C-type lectins function as membrane attack complexes in the mucosal immune system.
  • The pore-forming mechanism of RegIIIα provides insight into host-microbiota mutualism.
  • Understanding this antibacterial mechanism is key to mucosal immunity research.