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Related Concept Videos

Formation of Lipopolysaccharides01:19

Formation of Lipopolysaccharides

Lipopolysaccharides (LPS) are crucial components of the outer membrane of Gram-negative bacteria, serving both structural and functional roles. It contributes to membrane stability and protects bacteria from host immune responses. LPS is composed of three major regions—lipid A, a core oligosaccharide, and an O antigen. The biosynthesis and assembly of LPS involve a highly coordinated set of enzymatic reactions and transport mechanisms. Additionally, LPS is recognized as an endotoxin, triggering...
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Bacterial toxins are sophisticated virulence factors that enable pathogenic bacteria to interact with, invade, and damage host tissues. These toxins fall broadly into two types: protein exotoxins, which are secreted into the environment and target specific host receptors, and lipopolysaccharide endotoxins, which are structural components of the bacterial outer membrane released primarily during bacterial lysis or membrane shedding. Exotoxins generally act more selectively, binding to cell...
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Updated: Jun 11, 2026

Isolation and Chemical Characterization of Lipid A from Gram-negative Bacteria
12:57

Isolation and Chemical Characterization of Lipid A from Gram-negative Bacteria

Published on: September 16, 2013

Development of small-molecule endotoxin sequestering agents.

Sunil A David1, Diptesh Sil

  • 1Department of Medicinal Chemistry, University of Kansas, Multidisciplinary Research Building, Room 320D, 2030 Becker Drive, Lawrence, KS 66047, USA. sdavid@ku.edu

Sub-Cellular Biochemistry
|July 2, 2010
PubMed
Summary
This summary is machine-generated.

Researchers designed a novel small molecule, DS-96, to neutralize endotoxin (lipopolysaccharide) and combat Gram-negative bacterial sepsis. This non-peptidic compound effectively neutralizes endotoxin and protects against sepsis in preclinical models.

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Isolation and Chemical Characterization of Lipid A from Gram-negative Bacteria
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Area of Science:

  • Medicinal Chemistry
  • Pharmacology
  • Microbiology

Background:

  • Sepsis is a life-threatening condition driven by Gram-negative bacteria, with endotoxin (lipopolysaccharide) as a key trigger.
  • Lipid A, the active component of endotoxin, possesses a unique structure enabling interaction with ligands like polymyxin B.
  • Polymyxin B neutralizes endotoxin but exhibits toxicity, necessitating the development of safer alternatives.

Purpose of the Study:

  • To rationally design non-peptidic, small-molecule inhibitors of lipopolysaccharide (LPS) for sepsis treatment.
  • To identify and characterize novel LPS-neutralizing agents with improved safety profiles compared to polymyxin B.

Main Methods:

  • Determined the structural basis for polymyxin B's interaction with lipid A.
  • Defined the essential pharmacophore for LPS recognition and neutralization in small molecules.
  • Synthesized and evaluated novel lipopolyamine compounds, including the lead candidate DS-96.

Main Results:

  • Identified DS-96, a novel lipopolyamine, as a potent LPS-neutralizing agent.
  • DS-96 demonstrated efficacy comparable to polymyxin B in in vitro assays.
  • DS-96 provided significant protection against endotoxicosis in animal models.

Conclusions:

  • DS-96 represents a promising non-peptidic, small-molecule therapeutic candidate for Gram-negative bacterial sepsis.
  • The study highlights successful structure-based drug design for developing safer endotoxin sequestrants.
  • Further preclinical assessment and toxicity studies are warranted for DS-96 development.