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Related Concept Videos

Peptidoglycan Synthesis01:28

Peptidoglycan Synthesis

Structure of PeptidoglycanPeptidoglycan is a vital structural component of the bacterial cell wall, providing mechanical strength and shape to the cell. It consists of repeating units of two sugars—N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM)—linked by β-1,4 glycosidic bonds. These sugar chains are cross-linked by short peptide chains, forming a mesh-like polymer that surrounds the bacterial plasma membrane.Cytoplasmic Phase – Precursor SynthesisPeptidoglycan biosynthesis begins in...
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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, triggering...
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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 pathway, which...
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Archaeal cell walls are structurally and compositionally distinct from their bacterial counterparts, lacking the characteristic peptidoglycan layer found in most bacteria. Instead, archaeal cell walls exhibit remarkable diversity, utilizing materials such as pseudomurein, polysaccharides, and proteins to construct their protective outer layers. This structural flexibility is closely tied to archaea's ecological adaptability.S-Layers: The Common Archaeal Cell WallThe S-layer is the most...
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Functional Complementation Analysis (FCA): A Laboratory Exercise Designed and Implemented to Supplement the Teaching of Biochemical Pathways
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Functional and morphological adaptation to peptidoglycan precursor alteration in Lactococcus lactis.

Marie Deghorain1, Laetitia Fontaine, Blandine David

  • 1Biochimie et Génétique Moléculaire Bactérienne, Institut des Sciences de la Vie, Université Catholique de Louvain, Louvain-la-Neuve 1348, Belgium.

The Journal of Biological Chemistry
|June 8, 2010
PubMed
Summary

Altering bacterial cell wall precursors in Lactococcus lactis impacts cell shape and division. This study reveals how modifying peptidoglycan synthesis affects bacterial morphogenesis and vancomycin resistance mechanisms.

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Semi-Quantitative Analysis of Peptidoglycan by Liquid Chromatography Mass Spectrometry and Bioinformatics
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Semi-Quantitative Analysis of Peptidoglycan by Liquid Chromatography Mass Spectrometry and Bioinformatics
09:09

Semi-Quantitative Analysis of Peptidoglycan by Liquid Chromatography Mass Spectrometry and Bioinformatics

Published on: October 13, 2020

Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Bacterial cell wall peptidoglycan assembly is a complex, regulated process.
  • Multienzyme complexes coordinate cell wall synthesis.
  • Understanding this process is key to developing new antibiotics.

Purpose of the Study:

  • To investigate the role of peptidoglycan substrate transformations in coordinating cell wall synthesis.
  • To explore the impact of altered peptidoglycan precursors on bacterial morphology and vancomycin resistance.

Main Methods:

  • Generated Lactococcus lactis mutant strains by substituting peptidoglycan precursor biosynthesis genes with those from Lactobacillus plantarum.
  • Created strains with partially or totally replaced d-Ala-ended precursors with d-Lac-ended precursors.
  • Analyzed muropeptide structures to assess enzyme activity alterations.

Main Results:

  • Incorporation of altered d-Lac-ended precursors into the cell wall induced morphological changes, including defects in cell elongation and separation.
  • Structural analysis confirmed altered activity of multiple peptidoglycan synthesis enzymes.
  • Optimization of the altered pathway was required to enhance vancomycin resistance.

Conclusions:

  • Peptidoglycan substrate alterations are crucial for the spatial and temporal coordination of cell wall synthesis machinery.
  • Modified peptidoglycan precursors significantly impact bacterial cell morphogenesis.
  • These findings provide insights into the mechanisms of vancomycin resistance.