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Related Concept Videos

Formation of Lipopolysaccharides01:19

Formation of Lipopolysaccharides

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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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In the plasma membrane, the lipids forming the bilayer can also act as an anchor to tether proteins to the membrane. The three main types of lipid anchors found in eukaryotes are – prenyl groups, fatty acyl groups, and glycosylphosphatidylinositol or GPI groups. Prenyl and fatty acyl groups act as anchors on the cytosolic surface of the membrane, whereas GPI anchors proteins on the extracellular side.
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Fats and lipids are crucial components in the human body. Some lipid-derived compounds, such as fat-soluble vitamins, eicosanoids, lipoproteins, and glycolipids, also play unique roles to support various  biological processes .
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Lipids also are sources of energy that power cellular processes. Like carbohydrates, lipids are composed of carbon, hydrogen, and oxygen, but these atoms are arranged differently. Most lipids are nonpolar and hydrophobic. Major types include fats and oils, waxes, phospholipids, and steroids.
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Isolation and Chemical Characterization of Lipid A from Gram-negative Bacteria
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Structure and function of lipid A-modifying enzymes.

Anandhi Anandan1, Alice Vrielink1

  • 1School of Molecular Sciences, University of Western Australia, Perth, Western Australia, Australia.

Annals of the New York Academy of Sciences
|September 26, 2019
PubMed
Summary
This summary is machine-generated.

Gram-negative bacteria modify lipopolysaccharides (LPS) using enzymes to evade immune responses. Understanding the structures of these enzymes, like PagP and ArnT, is key to developing new antibiotics against resistant bacteria.

Keywords:
ArnTPagLPagPantibioticsbacterialipid A modificationmultidrug resistancepEtN transferasestructure-function

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Enrichment of Bacterial Lipoproteins and Preparation of N-terminal Lipopeptides for Structural Determination by Mass Spectrometry
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Area of Science:

  • Microbiology
  • Structural Biology
  • Immunology

Background:

  • Lipopolysaccharides (LPS) are critical components of Gram-negative bacterial outer membranes, acting as endotoxins and interacting with host immune systems.
  • Bacteria evolve enzymatic modifications of LPS, particularly the lipid A region, to evade host immune detection and promote survival.
  • Enzymatic modifications include adding charged sugars (e.g., N-Ara4N) and phosphoethanolamine (pEtN), alongside lipid A acylation/deacylation.

Purpose of the Study:

  • To review two-component regulatory mechanisms controlling LPS-modifying enzymes.
  • To detail the structures of four key enzymes (PagP, PagL, pEtN transferases, ArnT) involved in lipid A modification.
  • To elucidate structure-function relationships for these enzymes to inform therapeutic development.

Main Methods:

  • Review of existing literature on LPS modification enzymes and their regulation.
  • Analysis of three-dimensional structures of PagP, PagL, pEtN transferases, and ArnT.
  • Structure-function analysis to understand substrate binding and catalytic mechanisms.

Main Results:

  • Detailed structural insights into four enzymes modifying the lipid A component of LPS.
  • Understanding of how enzyme structures dictate substrate specificity and catalytic activity.
  • Identification of potential targets for therapeutic intervention.

Conclusions:

  • A structure-function understanding of LPS-modifying enzymes is crucial for deciphering bacterial immune evasion strategies.
  • These enzymes represent promising targets for developing novel therapeutics to combat antibiotic resistance.
  • Further structural and functional studies can accelerate the design of new antimicrobial agents.