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Biosynthesis of Polysaccharides01:26

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Polysaccharides such as glycogen and starch are synthesized from nucleoside diphosphate sugars, primarily uridine diphosphate glucose (UDPG) and adenosine diphosphate glucose (ADPG). These activated glucose donors act as key intermediates in carbohydrate metabolism and biosynthesis. UDPG primarily involves glycogen synthesis in animals and many bacteria, while ADPG plays a fundamental role in starch synthesis in plants and certain bacteria.UDPG is formed when glucose-1-phosphate reacts with...
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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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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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Carbohydrates, proteins, and fats are the primary macronutrients in the human diet. However, carbohydrates are the most favored source of energy in the body. They can be found in a wide variety of foods, including whole grains, fruit, and vegetables, in various forms, such as sugars, starch, and dietary fiber. Based on their structure, carbohydrates are classified into three main classes— monosaccharides, disaccharides, and polysaccharides. The body's cells can only utilize simple...
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Protein glycosylation starts in the ER lumen and continues in the Golgi apparatus. Glycosyltransferases catalyze the addition of sugar molecules or glycosylation of proteins. Usually, these enzymes add sugars to the hydroxyl groups of selected serine or threonine residues to form O-linked glycans or the amino groups of asparagine residues to form N-linked glycans. Different positions on the same polypeptide chain can contain differently linked glycans.
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Polysaccharide Utilization Loci: Fueling Microbial Communities.

Julie M Grondin1, Kazune Tamura2, Guillaume Déjean2

  • 1Agriculture and Agri-Food Canada, Lethbridge Research and Development Centre, Lethbridge, Alberta, Canada.

Journal of Bacteriology
|February 1, 2017
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Summary
This summary is machine-generated.

Polysaccharide Utilization Loci (PULs) in Bacteroidetes bacteria break down complex carbohydrates. This review details a shift towards systems-based analyses to understand PUL function and ecological roles in various environments.

Keywords:
Bacteroidetescarbohydratecarbohydrate-active enzymes (CAZymes)metabolismmicrobiomepolysaccharide utilization loci (PULs)polysaccharidessymbiosis

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Area of Science:

  • Microbiology
  • Biochemistry
  • Genomics

Background:

  • Complex carbohydrates in biomass are vital nutrient sources for microbes.
  • Enzymatic breakdown of these carbohydrates fuels diverse microbial communities.
  • Carbohydrate-active enzymes and transporters are crucial for microbial competition.

Purpose of the Study:

  • To review historical perspectives and key findings on Polysaccharide Utilization Loci (PULs).
  • To highlight the evolution from sequence-based discovery to systems-based PUL analyses.
  • To explore the ecological implications and distribution of PULs.

Main Methods:

  • Review of existing literature.
  • Shift towards systems-based analyses integrating reverse genetics, biochemistry, enzymology, and structural biology.
  • Analysis of genomic data for PUL discovery and characterization.

Main Results:

  • Polysaccharide Utilization Loci (PULs) are key gene clusters in Bacteroidetes for complex carbohydrate saccharification.
  • Systems-based approaches provide precise insights into PUL molecular mechanisms.
  • Dynamic PUL deployment is observed in the human gut and other environments.

Conclusions:

  • PULs are critical for microbial nutrient acquisition and adaptation.
  • Systems-based analyses are essential for understanding PUL function and regulation.
  • PULs play significant ecological roles across marine, soil, and gut environments.