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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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Biological membranes show uneven distribution of different types of lipids in the inner and outer layers, resulting in transverse asymmetric membranes. The treatment of the erythrocyte membrane with the enzyme phospholipase confirmed the asymmetric nature of the lipid bilayer. The enzyme hydrolyzes lipids into fatty acids and hydrophilic groups. The phospholipase acts only on the outer layer of the membrane, while the inner layer remains intact. The phospholipase treatment resulted in 80%...
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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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Martini 3 as a Transferable Force Field for Lipopolysaccharide Parametrization.

Gvantsa Gutishvili1, Diane L Lynch1, James C Gumbart1,2

  • 1School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.

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Summary

We developed new coarse-grained (CG) models for lipopolysaccharides (LPS) from key Gram-negative bacteria. These models enable more efficient simulations of bacterial outer membranes (OMs) at larger scales and longer time scales.

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Area of Science:

  • Biophysics
  • Computational Biology
  • Microbiology

Background:

  • Lipopolysaccharides (LPS) are crucial outer membrane components of Gram-negative bacteria.
  • All-atom molecular dynamics (AA-MD) simulations offer high resolution but are computationally expensive for long timescales.
  • Coarse-grained (CG) models like Martini 3 provide computational efficiency but require accurate LPS parametrization.

Purpose of the Study:

  • To develop and validate transferable coarse-grained (CG) parameters for lipopolysaccharides (LPS).
  • To enable efficient simulation of Gram-negative bacterial outer membranes (OMs) at biologically relevant scales.
  • To address the limited availability of CG models for LPS in computational studies.

Main Methods:

  • Parametrization of 57 unique disaccharide units using the automated Bartender tool for CG-to-AA mapping.
  • Combination and manual refinement of parameters to model complete LPS molecules.
  • Extensive AA and CG simulations of asymmetric bilayers mimicking bacterial OMs.

Main Results:

  • Developed and validated CG parameters for LPS from *Escherichia coli*, *Salmonella enterica*, *Klebsiella pneumoniae*, and *Pseudomonas aeruginosa*.
  • CG simulations closely agreed with AA simulations for key structural and dynamic properties.
  • Demonstrated the accuracy and robustness of the transferable parameter set.

Conclusions:

  • The developed transferable CG parameter set is a valuable tool for simulating Gram-negative bacterial OMs.
  • Enables larger-scale and longer-timescale simulations compared to AA-MD.
  • Facilitates deeper understanding of bacterial outer membrane structure and dynamics.