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Acid Halides to Ketones: Gilman Reagent

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Copper-Mediated Cross-Coupling Selective for Pyroglutamate Post-Translational Modifications.

Yuxuan Ding¹, Yuecheng Jiang¹, Nicolas Lorenzo Serrat¹

¹Department of Chemistry, Rice University, Houston, Texas 77005, United States.

Journal of the American Chemical Society

|November 26, 2024

Summary

This summary is machine-generated.

Researchers developed a new method to modify pyroglutamate residues in peptides. This copper-catalyzed reaction allows for selective labeling and better understanding of pyroglutamate’s biological roles.

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Genetically-encoded Molecular Probes to Study G Protein-coupled Receptors

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Published on: September 13, 2013

Area of Science:

Biochemistry
Organic Chemistry
Chemical Biology

Background:

Pyroglutamate is a common N-terminal modification in proteins and peptide hormones.
The biological significance and prevalence of pyroglutamate remain poorly understood due to limited analytical and manipulative tools.
Existing methods struggle to selectively identify, quantify, or modify the pyrrolidinone structure of pyroglutamate.

Purpose of the Study:

To develop a novel chemical method for the selective modification of pyroglutamate residues in peptides.
To enable the study of pyroglutamate’s biological functions through targeted labeling and diversification.
To create tools for late-stage functionalization of pyroglutamate-containing biomolecules.

Main Methods:

A copper-catalyzed N-H cross-coupling reaction was employed for unprotected peptides.
The reaction conditions were optimized for mildness and compatibility with canonical amino acid residues.
Mechanistic investigations explored the role of copper binding and polypeptide structure in reactivity.

Main Results:

The developed method selectively targets N-terminal pyroglutamate residues.
The reaction proceeds under mild, operationally simple conditions and tolerates all standard amino acids.
Successful direct labeling and identification of a pyroglutamate hormone in porcine intestinal extracts were achieved.

Conclusions:

A new, selective copper-catalyzed cross-coupling reaction for N-terminal pyroglutamate modification has been established.
This method provides a valuable tool for studying pyroglutamate's biological roles and for peptide functionalization.
The reaction facilitates the analysis of pyroglutamate-modified peptides in complex biological samples.