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Structure and function of lipopolysaccharide binding protein.

R R Schumann1, S R Leong, G W Flaggs

  • 1Department of Immunology, Research Institute of Scripps Clinic, La Jolla, CA 92037.

Science (New York, N.Y.)
|September 21, 1990
PubMed
Summary

Lipopolysaccharide binding protein (LBP) structure was determined, revealing its role in binding bacterial lipopolysaccharides (LPS). This finding may lead to new treatments for sepsis and endotoxemia.

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Area of Science:

  • Biochemistry
  • Immunology
  • Molecular Biology

Background:

  • Lipopolysaccharide binding protein (LBP) is a plasma protein that interacts with bacterial lipopolysaccharides (LPS).
  • LPS are key components of Gram-negative bacteria, triggering immune responses.
  • Understanding LBP's structure and function is crucial for studying LPS-mediated inflammation.

Purpose of the Study:

  • To determine the primary structure of lipopolysaccharide binding protein (LBP).
  • To elucidate the molecular interactions between LBP and lipopolysaccharides (LPS).
  • To identify potential therapeutic targets for LPS-related diseases.

Main Methods:

  • Complementary DNA (cDNA) sequencing was employed to deduce the primary structure of LBP.
  • Sequence homology analysis was performed to compare LBP with related proteins.

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Main Results:

  • The primary structure of LBP was successfully determined through cDNA sequencing.
  • LBP exhibits sequence identity with bactericidal/permeability-increasing protein and cholesterol ester transport protein.
  • LBP forms high-affinity complexes with LPS, influencing monocyte and macrophage activation.

Conclusions:

  • The determined structure of LBP provides insights into its LPS-binding capabilities.
  • LBP plays a significant role in modulating the host response to LPS.
  • Targeting the LBP-LPS interaction pathway may offer therapeutic strategies for Gram-negative sepsis and endotoxemia.