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Phase II Reactions: Sulfation and Conjugation with α-Amino Acids01:19

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Sulfation and α-amino acid conjugation are two critical biotransformation reactions in drug metabolism. Sulfation, a phase II biotransformation reaction, involves adding a polar sulfate group to a drug, enhancing its water solubility and promoting excretion. This process can either co-occur with or occur independently of glucuronidation. Nonmicrosomal sulfotransferase enzymes catalyze the process. The reaction involves 3'-phosphoadenosine-5'-phosphosulfate or PAPS coenzyme...
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A peptide bond covalently attaches amino acids through a dehydration reaction. One amino acid's carboxyl group and another amino acid's amino group combine, releasing a water molecule. The resulting bond is the peptide bond. The products that such linkages form are peptides. As more amino acids join this growing chain, the resulting chain is a polypeptide. Each polypeptide has a free amino group at one end. This end has the N-terminal, or the amino-terminal, and the other end has a free...
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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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Acetylation, a phase II biotransformation reaction, introduces an acetyl group to drugs or their metabolites. Acetyltransferase enzymes facilitate this reaction, which resembles α-amino acid conjugation due to the addition of a functional group to the drug molecule.
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Decarboxylative Couplings for Late-Stage Peptide Modifications.

Meng Yao Zhang1, Lara R Malins2

  • 1Research School of Chemistry, Australian National University, Canberra, ACT, Australia.

Methods in Molecular Biology (Clifton, N.J.)
|December 28, 2019
PubMed
Summary

This study introduces a novel method for modifying peptides by functionalizing amino acid carboxylic acids. This approach enables the creation of custom peptides for diverse applications in medicinal chemistry and materials science.

Keywords:
Cross-couplingDecarboxylationNickel catalysisPeptide coupling reagentsPeptide modificationSolid-phase peptide synthesis

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Area of Science:

  • Medicinal Chemistry
  • Chemical Biology
  • Materials Science
  • Synthetic Organic Chemistry

Background:

  • Designer peptides are crucial in medicinal chemistry, chemical biology, and materials science.
  • Direct modification of amino acid functional groups in peptides is highly desirable.
  • Existing peptide synthesis methods are robust but offer limited diversification of native residues.

Purpose of the Study:

  • To present a novel synthetic strategy for peptide modification.
  • To enable late-stage diversification of peptide structures.
  • To facilitate the synthesis of custom designer peptides.

Main Methods:

  • Decarboxylative functionalization of peptidic carboxylic acids.
  • Activation of carboxylic acids using conventional strategies.
  • Nickel-catalyzed cross-coupling chemistry for C-C bond formation.
  • Application to unprotected peptide substrates.

Main Results:

  • Successful alkylation of a model peptide substrate via decarboxylation.
  • Demonstration of a new route for introducing synthetic handles onto peptides.
  • Highlighting the broad utility of the method for peptide synthesis.

Conclusions:

  • The described nickel-catalyzed decarboxylative alkylation is a powerful tool for peptide modification.
  • This strategy expands the synthetic toolkit for creating designer peptides.
  • The method offers efficient late-stage functionalization of peptides.