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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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Outer Layers of the Cell Envelope01:18

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The outermost layers of prokaryotic cells play a critical role in their survival, virulence, and interaction with the environment. These layers, often composed of polysaccharides, polypeptides, or proteins, form protective and adhesive structures that vary in organization and function.Capsules and Slime LayersCapsules are highly organized, tightly bound layers that firmly attach to the bacterial cell wall. Capsules are usually made of polysaccharides, though some are made of polypeptides. These...
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Peptidoglycan Synthesis01:28

Peptidoglycan Synthesis

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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...
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Porin Insertion in the Outer Mitochondrial Membrane01:12

Porin Insertion in the Outer Mitochondrial Membrane

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Porins are beta-barrel proteins translocated to the mitochondrial outer membrane through the TOM complex into the intermembrane space. Porin precursors bind TIM chaperones within the intermembrane space and are guided to the Sorting and Assembly Machinery complex or SAM complex on the outer mitochondrial membrane.
Three models describe the assembly of porins by the SAM complex and their insertion into the outer membrane. Model 1 suggests that porins are assembled outside the SAM channel as the...
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Gram-negative Bacterial Protein Secretion Systems01:17

Gram-negative Bacterial Protein Secretion Systems

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Gram-negative bacteria utilize sophisticated protein secretion systems to transport proteins across their double-membrane envelope into the extracellular environment or host cells. Based on their mechanism of action, these systems are classified into one-step and two-step pathways.One-Step Secretion Systems (Types I, III, IV, and VI)One-step secretion systems bypass the periplasm entirely, forming a continuous channel that spans both the inner and outer membranes:Type I Secretion System (T1SS):...
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Lipids as Anchors01:32

Lipids as Anchors

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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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Related Experiment Video

Updated: Apr 27, 2026

Separation of the Cell Envelope for Gram-negative Bacteria into Inner and Outer Membrane Fractions with Technical Adjustments for Acinetobacter baumannii
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Separation of the Cell Envelope for Gram-negative Bacteria into Inner and Outer Membrane Fractions with Technical Adjustments for Acinetobacter baumannii

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Structural basis for outer membrane lipopolysaccharide insertion.

Haohao Dong1, Quanju Xiang2, Yinghong Gu3

  • 11] Biomedical Research Centre, Norwich Medical School, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, UK [2] Biomedical Sciences Research Complex, School of Chemistry, University of St Andrews, North Haugh, St Andrews KY16 9ST, UK.

Nature
|July 4, 2014
PubMed
Summary
This summary is machine-generated.

Researchers revealed the structure of the lipopolysaccharide (LPS) transport complex (LptD-LptE) in Gram-negative bacteria. This discovery clarifies bacterial outer membrane biogenesis and offers new avenues for combating antibiotic-resistant pathogens.

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Purification and Visualization of Lipopolysaccharide from Gram-negative Bacteria by Hot Aqueous-phenol Extraction
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Isolation and Chemical Characterization of Lipid A from Gram-negative Bacteria
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Isolation and Chemical Characterization of Lipid A from Gram-negative Bacteria

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Area of Science:

  • Microbiology
  • Structural Biology
  • Biochemistry

Background:

  • Lipopolysaccharide (LPS) is vital for Gram-negative bacteria, providing protection against environmental stressors and antibiotics.
  • The seven-protein LPS transport complex (LptA-LptG) moves LPS from the inner to the outer membrane, but its mechanism remains unclear.

Purpose of the Study:

  • To elucidate the structural mechanism of LPS transport across the bacterial envelope.
  • To determine the structure of the integral membrane LPS translocon complex, LptD-LptE.

Main Methods:

  • X-ray crystallography to determine the LptD-LptE complex structure.
  • Molecular dynamics simulations to analyze LPS transport dynamics.
  • Functional assays to validate the proposed transport mechanism.

Main Results:

  • The first crystal structure of the LptD-LptE complex, revealing a unique 'barrel and plug' architecture.
  • LptD forms a large 26-stranded β-barrel, the largest reported to date.
  • LptE, a roll-like structure, sits within the LptD barrel, suggesting a novel transport pathway for LPS components.

Conclusions:

  • The LptD-LptE structure provides critical insights into bacterial outer membrane biogenesis.
  • The proposed LPS transport mechanism involves passage through the LptD barrel and insertion into the outer membrane via a lateral opening.
  • Findings hold potential for developing new drugs targeting multi-drug resistant bacteria.