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Glucuronidation, a pivotal phase II biotransformation process, involves the coupling of glucuronic acid to a drug or xenobiotic. Given its widespread occurrence and critical role in drug metabolism, it's considered the most crucial phase II reaction. It enhances the water solubility of substances, aiding their expulsion from the body. The driving force behind these reactions is a group of enzymes known as UDP-glucuronosyltransferases (UGTs). UGTs facilitate the transfer of a glucuronic acid...
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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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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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Acetoacetic ester synthesis is a method to obtain ketones from alkyl halides and β-keto esters. The reaction occurs in the presence of an alkoxide base that abstracts the acidic proton of the β-keto esters. The step results in an enolate ion which is doubly stabilized. The enolate then reacts with an alkyl halide via the SN2 process to produce an alkylated ester intermediate with a new C–C bond. The hydrolysis of the intermediate, followed by acidification, results in an...
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Glucuronoyl esterases are active on the polymeric substrate methyl esterified glucuronoxylan.

Peter Biely1, Anna Malovíková1, Iveta Uhliariková1

  • 1Institute of Chemistry, Slovak Academy of Sciences, 84538 Bratislava, Slovakia.

FEBS Letters
|July 29, 2015
PubMed
Summary

Microbial glucuronoyl esterases act on beechwood glucuronoxylan methyl ester, a polymeric substrate mimicking plant cell walls. This study demonstrates enzymatic deesterification using (1)H NMR spectroscopy for the first time.

Keywords:
4-O-methyl-d-glucuronic acidGlucuronoxylanGlucuronoxylan methyl esterGlucuronoyl esteraseNMR

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Area of Science:

  • Biochemistry
  • Enzymology
  • Plant Cell Wall Structure

Background:

  • Glucuronoxylan is a major hemicellulose in plant secondary cell walls.
  • Glucuronoyl esterases (GEs) are enzymes capable of de-esterifying glucuronoxylan.
  • Understanding GE activity is crucial for biomass degradation and modification.

Purpose of the Study:

  • To investigate the activity of microbial GEs on a polymeric glucuronoxylan methyl ester substrate.
  • To compare the action of GEs on a natural-like substrate versus artificial substrates.
  • To characterize the deesterification process using advanced spectroscopic techniques.

Main Methods:

  • Preparation of alkali extracted beechwood glucuronoxylan methyl ester.
  • Enzymatic assays using GEs from Ruminococcus flavefaciens, Schizophyllum commune, and Trichoderma reesei.
  • (1)H Nuclear Magnetic Resonance ((1)H NMR) spectroscopy for monitoring deesterification.

Main Results:

  • Beechwood glucuronoxylan methyl ester serves as an effective substrate for microbial GEs.
  • Enzymatic deesterification was successfully monitored and quantified by (1)H NMR.
  • The study provides the first evidence of GEs acting on a polymeric substrate closely resembling natural plant cell wall structures.

Conclusions:

  • Microbial GEs can effectively de-esterify polymeric glucuronoxylan methyl ester.
  • This polymeric substrate offers a more biologically relevant model for studying GE activity.
  • The findings advance our understanding of enzymatic modifications of plant biomass.