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Biosynthesis of Lipids01:29

Biosynthesis of Lipids

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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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Synthesis of Phosphatidylcholine in the ER Membrane01:27

Synthesis of Phosphatidylcholine in the ER Membrane

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The ER synthesizes lipids for building cell membranes and performing cellular functions such as energy storage and signaling. The lipid synthesis machinery embedded in the ER membrane primarily collects all reactants from the cytosol. Following synthesis, the secretory pathway and the ER contact sites distribute these lipids to other cellular organelles. Additionally, the energy-rich triacylglycerides are transported from the ER via lipid droplets.
The major components of all eukaryotic cell...
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Membrane Lipids01:32

Membrane Lipids

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Lipids are an essential component of all biological membranes. The average lipid content in mammalian membranes is 50%, though it can be as low as 20% in the inner mitochondrial membrane or as high as 80% in the myelin sheath present around the nerve cells.
Phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and sphingomyelin are the most common phospholipids present in mammalian membranes. At physiological pH, phosphatidylserine is negatively charged, while the other three...
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Membrane Lipids01:32

Membrane Lipids

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Asymmetric Lipid Bilayer01:35

Asymmetric Lipid Bilayer

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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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Assembly of the Lipid Bilayer in the ER01:28

Assembly of the Lipid Bilayer in the ER

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Biological membranes are more than just a barrier separating cell cytoplasm from the outside environment. They are highly dynamic and help maintain the integrity and physiological stability of the cells as well as membrane-bound organelles. Membranes also play vital roles in cell-to-cell and intracellular communication.
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Diverse unsaturated fatty acids bypass loss of FabH-catalysed initiation of fatty acid synthesis in <i>Enterococcus faecalis</i>.

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A Single-Nucleotide Substitution Generates a de Novo Promoter That Activates a Latent Metabolic Bypass in Escherichia coli.

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Related Experiment Video

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Author Spotlight: Advancing Cell Membrane Biophysics - Exploring Interactions and Challenges Through Experimental and Computational Approaches
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Biosynthesis of Membrane Lipids.

John E Cronan, Charles O Rock

    Ecosal Plus
    |October 8, 2015
    PubMed
    Summary

    Bacterial lipid synthesis pathways in E. coli and S. enterica are well-studied but show diversity. New tools enable antimicrobial discovery targeting these pathways and reveal novel fatty acid roles beyond membrane structure.

    Area of Science:

    • Microbiology
    • Biochemistry
    • Molecular Biology

    Background:

    • The lipid synthetic pathways in Escherichia coli and Salmonella enterica are foundational models for bacterial lipid synthesis.
    • While the structural biology of fatty acid synthesis proteins is largely complete, membrane-bound phospholipid synthesis enzymes remain challenging for structural analysis.
    • Recent genetic and technological advancements are providing deeper insights into bacterial lipid metabolism.

    Purpose of the Study:

    • To summarize recent advances in understanding bacterial lipid synthesis pathways.
    • To highlight the utility of Escherichia coli and Salmonella enterica as model organisms in this field.
    • To discuss the implications of these advances for antimicrobial discovery and understanding fatty acid functions.

    Main Methods:

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    • Utilizing advances in genetic technology to rigorously test essential lipid synthesis genes.
    • Employing mass spectrometry for detailed lipid composition analysis and protein interaction studies.
    • Leveraging genetic constructs to analyze heterologous gene functions.

    Main Results:

    • Most lipid synthesis genes are essential under standard growth conditions, with conditionally lethal mutants available for physiological studies.
    • Mass spectrometry enables accurate lipid profiling and detection of protein-protein interactions within and outside the lipid pathway.
    • These combined advances facilitate the discovery of new antimicrobials targeting lipid synthesis and elucidate the mechanisms of existing ones.

    Conclusions:

    • Bacterial lipid synthesis is a rich area for antimicrobial drug discovery, with E. coli and S. enterica serving as key model systems.
    • Fatty acids have roles beyond structural membrane components, including the synthesis of essential enzyme cofactors like biotin and lipoic acid.
    • Sophisticated genetic tools allow for the study of novel fatty acid-derived molecules, such as quorum-sensing signals, even in non-native contexts.