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Related Concept Videos

Phase II Reactions: Methylation Reactions01:17

Phase II Reactions: Methylation Reactions

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Methylation is a phase II biotransformation process involving the attachment of a methyl group to a substrate. Enzymes known as methyltransferases orchestrate this reaction.
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A rapid and selective methionine oxidative modification strategy.

Meng-Qian Zhang1, Pei-Yang He1, Jin-Jian Hu1

  • 1Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology, Department of Chemistry, Tsinghua University, Beijing, China.

Journal of Peptide Science : an Official Publication of the European Peptide Society
|October 1, 2022
PubMed
Summary
This summary is machine-generated.

Chemists developed a fast, selective method to modify methionine, an oxidation-sensitive amino acid. This new technique efficiently creates sulfoximine-modified peptides, expanding peptide functionalization options.

Keywords:
chemical modificationmethioninepeptidessulfoximination

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Area of Science:

  • Biochemistry
  • Organic Chemistry
  • Chemical Biology

Background:

  • Site-selective late-stage diversification of peptides and proteins is a significant challenge.
  • Strategies for modifying low-abundance natural amino acids require further development.
  • Methionine, an oxidation-sensitive and low-abundance amino acid, presents a promising target for selective modification.

Purpose of the Study:

  • To develop an efficient and highly selective method for modifying methionine residues in peptides.
  • To expand the toolbox for methionine-based peptide functionalization.

Main Methods:

  • A one-pot O- and N-transfer reaction was employed for peptide modification.
  • The reaction targets methionine residues for chemo- and site-selective modification.
  • Various peptide substrates were used to demonstrate the protocol's generality and tolerance.

Main Results:

  • Near-perfect conversion of methionine residues to sulfoximine-modified peptides was achieved within 10 minutes.
  • The reaction demonstrated high tolerance to other natural amino acids present in the peptide substrates.
  • Natural peptides were successfully modified, yielding sulfoximination products with high conversion rates.

Conclusions:

  • A novel, efficient, and highly selective method for sulfoximination of methionine residues in peptides has been established.
  • This methodology offers a valuable new strategy for peptide functionalization.
  • The developed protocol expands the capabilities for modifying peptides at specific sites, particularly targeting methionine.