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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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Lipid Catabolism01:25

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Triglycerides serve as crucial long-term energy storage molecules in microorganisms, providing a dense source of metabolic energy. Their breakdown is mediated by lipases, which hydrolyze triglycerides into glycerol and free fatty acids. Each of these components follows distinct metabolic pathways, ultimately contributing to ATP synthesis and cellular energy homeostasis.Glycerol MetabolismGlycerol, released from triglyceride hydrolysis, is phosphorylated by glycerol kinase to form...
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Biosynthesis in bacteria is a fundamental anabolic process that generates essential macromolecules, including proteins, nucleic acids, lipids, and polysaccharides. These macromolecules are critical for cellular growth, replication, and function. The process is tightly regulated and energetically linked to catabolic pathways to ensure optimal resource utilization.Biosynthetic pathways begin with precursor metabolites such as pyruvate, acetyl-CoA, and glucose-6-phosphate derived from glycolysis,...
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Overview of Fatty Acid Metabolism01:28

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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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Amino acid biosynthesis is essential for cell growth, protein synthesis, and metabolic regulation. Cells generate essential and non-essential amino acids from metabolic intermediates to sustain vital biological functions. These intermediates originate from key metabolic pathways: glycolysis, the tricarboxylic acid (TCA) cycle, and the pentose phosphate pathway. Important precursors include α-ketoglutarate, pyruvate, oxaloacetate, phosphoenolpyruvate, and erythrose-4-phosphate, which...
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Formation of Lipopolysaccharides01:19

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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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Related Experiment Video

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Functional Complementation Analysis FCA: A Laboratory Exercise Designed and Implemented to Supplement the Teaching of Biochemical Pathways
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Deciphering and engineering the polyunsaturated fatty acid synthase pathway from eukaryotic microorganisms.

Pengfei Guo1,2, Liang Dong1,2, Fangzhong Wang1,2,3

  • 1Laboratory of Synthetic Microbiology, School of Chemical Engineering and Technology, Tianjin University, Tianjin, China.

Frontiers in Bioengineering and Biotechnology
|December 1, 2022
PubMed
Summary

Polyunsaturated fatty acids (PUFAs) are vital nutrients synthesized via distinct pathways in eukaryotes. This review details the PUFA synthase pathway, highlighting its potential for microbial production and future research needs.

Keywords:
PUFA synthaseeukaryotesfunctional domainiterative PKSpolyunsaturated fatty acidssynthesis mechanisms

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Metabolic Engineering

Background:

  • Polyunsaturated fatty acids (PUFAs) are essential nutrients for human health.
  • Eukaryotes synthesize PUFAs via desaturase/elongase or PUFA synthase pathways.
  • The PUFA synthase pathway offers advantages like fewer byproducts and reduced cofactor requirements.

Purpose of the Study:

  • To provide an updated overview of the eukaryotic PUFA synthase pathway.
  • To summarize domain functions and propose PUFA synthesis mechanisms.
  • To identify future research directions for pathway engineering.

Main Methods:

  • Literature review and synthesis of existing research on eukaryotic PUFA synthases.
  • Comparative analysis of eukaryotic and prokaryotic PUFA synthase pathways.
  • Identification of challenges and opportunities in PUFA production.

Main Results:

  • Eukaryotic PUFA synthases share domain types with prokaryotic counterparts but differ in arrangement and properties.
  • Understanding these differences is crucial for pathway optimization.
  • Challenges include incomplete mechanistic understanding and genetic manipulation difficulties in eukaryotes.

Conclusions:

  • The PUFA synthase pathway holds significant potential for microbial cell factories.
  • Further elucidation of synthesis mechanisms and host engineering are key to improving PUFA productivity.
  • Optimizing this pathway can maximize human health benefits.