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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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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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Dietary triglycerides from chyme in the duodenum are mixed with bile salts produced by the liver to emulsify fats. As a result, large droplets are broken down into smaller ones, increasing the surface area for enzymatic action. Once emulsified, pancreatic lipases hydrolyze the triglycerides into free fatty acids and monoglycerides.
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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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Membrane Fluidity01:26

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Membrane fluidity is explained by the fluid mosaic model of the cell membrane, which describes the plasma membrane structure as a mosaic of components—including phospholipids, cholesterol, proteins, and carbohydrates—that gives the membrane a fluid character.
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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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Lipid Droplet Isolation for Quantitative Mass Spectrometry Analysis
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Lipid Droplet Biogenesis.

Tobias C Walther1,2,3,4, Jeeyun Chung1,2, Robert V Farese1,2,3

  • 1Department of Genetics and Complex Diseases, Harvard T.H. Chan School of Public Health, Boston, Massachusetts 02115; email: twalther@hsph.harvard.edu , Robert@hsph.harvard.edu.

Annual Review of Cell and Developmental Biology
|August 11, 2017
PubMed
Summary
This summary is machine-generated.

Lipid droplets (LDs) are vital cell components storing energy. This review details their formation from the endoplasmic reticulum (ER), highlighting key proteins and identifying knowledge gaps in LD biology and disease.

Keywords:
biogenesisendoplasmic reticulumlipid dropletsneutral lipidsseipinsterol esterstriacylglyceroltriglycerides

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Area of Science:

  • Cell Biology
  • Biophysics
  • Metabolic Regulation

Background:

  • Lipid droplets (LDs) are essential organelles involved in neutral lipid storage and metabolic regulation.
  • Cells form LDs through a de novo process, creating an emulsion with LDs as the dispersed phase.
  • Understanding LD biogenesis is crucial for comprehending cellular energy homeostasis.

Purpose of the Study:

  • To review the current understanding of lipid droplet (LD) biogenesis.
  • To present a model of LD formation originating from the endoplasmic reticulum (ER).
  • To identify areas requiring further research in LD biology and its link to diseases.

Main Methods:

  • Literature review of existing research on lipid droplet formation.
  • Analysis of biophysical processes governing LD biogenesis.
  • Integration of knowledge on proteins involved in LD formation.

Main Results:

  • A step-by-step model for LD formation from the ER is proposed.
  • Key proteins regulating the biophysical aspects of LD biogenesis are highlighted.
  • Connections between LD biology, cellular physiology, and disease are discussed.

Conclusions:

  • Lipid droplet biogenesis is a complex, multi-step process originating from the ER.
  • Further research is needed to fully elucidate the mechanisms and regulatory proteins involved in LD formation.
  • Altered LD biology is implicated in various physiological conditions and diseases.