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Covalently Linked Protein Regulators02:04

Covalently Linked Protein Regulators

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Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
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Protein Glycosylation

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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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Modification of secretory and transmembrane proteins entering the rough ER begins in the ER lumen. These modifications aid in protein folding and stabilize the acquired tertiary structure. Protein modifications in the rough ER co-occur at different stages of protein folding.
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In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
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Phase II reactions are essential for the detoxification and elimination of drugs from the body. These reactions involve the conjugation of parent drugs or their phase I metabolites with endogenous molecules, resulting in more hydrophilic drug conjugates. The primary conjugation reactions in this phase are sulfation and glucuronidation. Both sulfation and glucuronidation typically produce biologically inactive metabolites. However, in some cases involving prodrugs, active metabolites may be...
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Extraction and Purification of Polyphenols from Freeze-dried Berry Powder for the Treatment of Vascular Smooth Muscle Cells In Vitro
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Molecular modification of proanthocyanidins.

Qing Huo1,2, Xiangye Kong1, Xiaofang Yang1

  • 1a Biochemical Engineering College of Beijing Union University , Beijing , China.

Bioengineered
|July 27, 2016
PubMed
Summary

Enzymatic acylation enhances proanthocyanidin solubility in oils and improves oxidation resistance. This study optimized conditions using Novozym435 lipase, achieving a 60.9% esterification yield.

Keywords:
Novozym435esterificationlipase-catalyzedperoxide valueproanthocyanidins

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Biosynthesis of a Flavonol from a Flavanone by Establishing a One-pot Bienzymatic Cascade
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Biosynthesis of a Flavonol from a Flavanone by Establishing a One-pot Bienzymatic Cascade
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Area of Science:

  • Biocatalysis
  • Organic Chemistry
  • Food Science

Background:

  • Proanthocyanidins (PAs) are potent antioxidants with limited oil solubility.
  • Improving PA solubility and stability is crucial for their application in food and cosmetic industries.

Purpose of the Study:

  • To develop a regioselective enzymatic acylation method for PAs.
  • To enhance PA solubility in oil phases and improve their oxidation resistance.

Main Methods:

  • Enzymatic acylation of PAs using Novozym435 lipase and lauric acid.
  • Optimization of reaction conditions including solvent (butanol), substrate ratio (4:1 lauric acid:PAs), and addition of molecular sieve.
  • Product separation and analysis using Thin Layer Chromatography (TLC).

Main Results:

  • Butanol was identified as the optimal solvent for the enzymatic acylation.
  • Addition of molecular sieve at 5 hours increased esterification conversion.
  • Optimal TLC solvent system (ethyl acetate: petroleum ether: acetic acid = 2:3:0.5) achieved effective separation.
  • A maximum esterification yield of 60.9% was obtained.

Conclusions:

  • Regioselective enzymatic acylation is a viable method to enhance PA oil solubility and stability.
  • Optimized reaction and separation conditions provide a high yield of esterified PAs.
  • This approach offers a promising strategy for incorporating PAs into oil-based products.