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Oligosaccharide Assembly01:24

Oligosaccharide Assembly

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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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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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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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Peptidoglycan Synthesis01:28

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Structure of PeptidoglycanPeptidoglycan is a vital structural component of the bacterial cell wall, providing mechanical strength and shape to the cell. It consists of repeating units of two sugars—N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM)—linked by β-1,4 glycosidic bonds. These sugar chains are cross-linked by short peptide chains, forming a mesh-like polymer that surrounds the bacterial plasma membrane.Cytoplasmic Phase – Precursor SynthesisPeptidoglycan...
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Glycosylation, the most common post-translational modification for proteins, serves diverse functions. Adding sugars to proteins makes the proteins more resistant to proteolytic digestion. Glycosylated proteins can act as markers and receptors to promote cell-cell adhesion. Additionally, they have many essential quality control functions in the cell, such as correct protein folding and facilitating transport of misfolded proteins to the cytosol, which can be degraded.
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Related Experiment Video

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High-throughput Synthesis of Carbohydrates and Functionalization of Polyanhydride Nanoparticles
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Principles of modern solid-phase oligosaccharide synthesis.

Clay S Bennett1

  • 1Department of Chemistry, Tufts University, 62 Talbot Ave., Medford, MA, USA. clay.bennett@tufts.edu.

Organic & Biomolecular Chemistry
|February 6, 2014
PubMed
Summary

Solid-phase synthesis offers an automated approach for creating complex oligosaccharides, crucial for understanding their biological roles. This perspective outlines key principles and future directions for this important chemical synthesis technique.

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Area of Science:

  • Carbohydrate Chemistry
  • Organic Synthesis
  • Biotechnology

Background:

  • Oligosaccharides play vital roles in numerous biological processes.
  • Chemical synthesis is essential for accessing these complex molecules for study.
  • Solid-phase synthesis (SPOS) presents an advantageous method for oligosaccharide construction.

Purpose of the Study:

  • To provide an overview of principles for planning solid-phase oligosaccharide synthesis.
  • To highlight recent advancements in SPOS.
  • To identify areas requiring further research and development in the field.

Main Methods:

  • Principles of solid-phase synthesis applied to oligosaccharides.
  • Review of current methodologies and strategies in SPOS.
  • Discussion of automation potential in oligosaccharide synthesis.

Main Results:

  • Solid-phase synthesis enables efficient and automated construction of oligosaccharides.
  • Recent achievements demonstrate the feasibility and versatility of SPOS.
  • Challenges remain in specific areas, necessitating further innovation.

Conclusions:

  • Solid-phase oligosaccharide synthesis is a powerful tool for biological research.
  • Continued development is needed to overcome existing limitations in SPOS.
  • Automation through SPOS will accelerate the discovery of novel carbohydrate functions.