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Related Concept Videos

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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The plasma membrane is an essential cellular structure responsible for maintaining cellular integrity and regulating the selective transport of molecules. While bacteria and archaea share the fundamental function of plasma membranes, their structural and molecular differences reflect adaptations to distinct ecological and physiological challenges.Bacterial Plasma MembranesBacterial plasma membranes are predominantly composed of phospholipids with fatty acid chains ester-linked to a glycerol...
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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.
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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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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.
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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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Archaeal phospholipids: Structural properties and biosynthesis.

Antonella Caforio1, Arnold J M Driessen1

  • 1Department of Molecular Microbiology, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Nijenborgh 7, 9747 AG, Groningen, The Netherlands; The Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 7, 9747 AG, Groningen, The Netherlands.

Biochimica Et Biophysica Acta. Molecular and Cell Biology of Lipids
|December 24, 2016
PubMed
Summary

Archaeal ether-linked phospholipids, distinct from bacterial ester-linked ones, provide stability in extreme environments. Recent advances illuminate their biosynthesis and evolutionary significance, marking a key phylogenetic divide.

Keywords:
Archaeal lipidsBiosynthesisLipid chemical structuresLipid divideMembrane properties

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Area of Science:

  • Biochemistry
  • Microbiology
  • Evolutionary Biology

Background:

  • Cellular membranes are crucial for all life, with phospholipids forming lipid bilayers.
  • Archaeal and bacterial membrane phospholipids exhibit significant chemical differences.
  • Archaeal lipids, ether-linked and isoprenoid-based, confer stability under extreme conditions.

Purpose of the Study:

  • To detail the chemical and physical properties of archaeal lipids and membranes.
  • To summarize current knowledge on the enzymology of archaeal lipid biosynthesis.
  • To discuss evolutionary theories behind the bacterial-archaeal 'Lipid Divide'.

Main Methods:

  • Review of existing literature on archaeal lipid properties and biosynthesis.
  • In vitro reconstitution of archaeal lipid biosynthesis pathways.
  • Comparative analysis of archaeal and bacterial lipid structures and evolutionary origins.

Main Results:

  • Characterization of key steps in archaeal lipid biosynthesis.
  • Demonstration of archaeal lipid stability in extreme environments.
  • Identification of ether-linked phospholipids as a phylogenetic marker for Archaea.

Conclusions:

  • Archaeal ether-linked lipids are phylogenetically distinct and crucial for survival in extreme environments.
  • Understanding archaeal lipid biosynthesis provides insights into early life evolution.
  • The 'Lipid Divide' highlights fundamental differences between Archaea and Bacteria.