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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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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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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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Polymers02:34

Polymers

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Carboxylic Acid Derivatives: Overview01:15

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Carboxylic acid derivatives are formed by replacing the hydroxyl group of carboxylic acids with a different functional group. The most common carboxylic acid derivatives are:
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Activation and Conjugation of Soluble Polysaccharides using 1-Cyano-4-Dimethylaminopyridine Tetrafluoroborate CDAP
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Progress in Polysaccharide Derivatization and Properties.

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Summary

Polysaccharide derivatives offer industrial applications due to unique biochemical functions like immune support and antioxidant properties. Molecular modification enhances their bioavailability and biological activities for various uses.

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Area of Science:

  • Biochemistry and Materials Science
  • Focus on the biochemical functions and industrial applications of polysaccharides.

Background:

  • Polysaccharides exhibit valuable properties including immune modulation, antioxidant, and anticoagulant effects.
  • These properties contribute to health benefits such as enhancing physique and combating aging.
  • Molecular modification is crucial for understanding structure-activity relationships.

Purpose of the Study:

  • To explore the potential of polysaccharides and their derivatives in various industrial fields.
  • To investigate how molecular modification influences the biological activities of polysaccharides.
  • To enhance the bioavailability and application scope of polysaccharide derivatives.

Main Methods:

  • Chemical modification techniques such as carboxymethylation, sulfonylation, phosphorylation, acetylation, and hydroxypropylation.
  • Synthesis of cationic and other polysaccharide derivatives.
  • Analysis of structure-activity relationships through molecular modification.

Main Results:

  • Molecular modification yields diverse polysaccharide derivatives with varied structures.
  • Modified polysaccharides exhibit improved bioavailability.
  • Different derivatives display distinct biological activities, including immune, inhibitory, antioxidant, and anticoagulant properties.

Conclusions:

  • Polysaccharide derivatives present significant opportunities for industrial applications.
  • Chemical modification is a key strategy to tailor polysaccharide properties for specific biological systems.
  • Further research into structure-activity relationships will unlock novel applications.