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Related Concept Videos

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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,...
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Microbial membranes exhibit remarkable diversity in lipid composition, reflecting evolutionary adaptations to various environmental conditions. The three domains of life—Bacteria, Archaea, and Eukarya—synthesize membrane lipids through distinct biosynthetic pathways, leading to fundamental structural differences that impact membrane stability, function, and adaptability.Fatty Acid-Based Lipids in Bacteria and EukaryaBacteria and eukaryotes share a common fatty acid biosynthesis...
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Lipids include a diverse group of compounds that are largely nonpolar in nature. This is because they are hydrocarbons that include mostly nonpolar carbon-carbon or carbon-hydrogen bonds. Non-polar molecules are hydrophobic (“water fearing”), or insoluble in water. Lipids perform many different functions in a cell. Cells store energy for long-term use in the form of fats. Lipids also provide insulation from the environment for plants and animals. For example, they help keep aquatic...
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Related Experiment Video

Updated: Sep 23, 2025

Isolation and Chemical Characterization of Lipid A from Gram-negative Bacteria
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Lipid A Structural Determination from a Single Colony.

Hyojik Yang1, Richard D Smith1,2, Courtney E Chandler1

  • 1Department of Microbial Pathogenesis, School of Dentistry, University of Maryland, Baltimore, Maryland 21201, United States.

Analytical Chemistry
|May 16, 2022
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Summary
This summary is machine-generated.

A new method, FLATn, enables rapid lipid A structure analysis from single bacterial colonies or clinical samples in about an hour. This technique aids in identifying novel lipid A structures and antibiotic resistance genes.

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Area of Science:

  • Analytical Chemistry
  • Microbiology
  • Mass Spectrometry

Background:

  • Lipid A structure analysis is crucial for understanding Gram-negative bacteria.
  • Conventional methods are time-consuming and require extensive sample preparation.
  • Fast Lipid Analysis Technique (FLAT) offers a rapid approach.

Purpose of the Study:

  • To introduce FLATn, a tandem MS variant of FLAT for direct lipid A structure analysis.
  • To demonstrate the efficiency and comprehensive data generation of FLATn.
  • To showcase FLATn's applicability to clinical samples without prior cultivation.

Main Methods:

  • Utilized FLATn for MALDI tandem mass spectrometry analysis.
  • Applied the technique directly to single Gram-negative bacterial colonies.
  • Analyzed lipid A structures from a complex clinical urine sample.

Main Results:

  • FLATn generated comprehensive lipid A fragment data, including ester-bonded acyl chains, cross-ring, and glycosidic cleavages.
  • The method successfully identified an *E. coli* isolate from a urine sample.
  • FLATn detected the mobile colistin resistance-1 (*mcr-1*) gene and identified a structural isomer of lipid A.

Conclusions:

  • FLATn significantly reduces analysis time for lipid A structure determination.
  • The technique provides detailed structural information for novel or known lipid A.
  • FLATn is effective for direct analysis of clinical samples, aiding in rapid pathogen identification and characterization of resistance mechanisms.