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Related Experiment Video

Updated: Nov 15, 2025

Synthesis of Protein Bioconjugates via Cysteine-maleimide Chemistry
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A reactive peptide interface for site-selective cysteine bioconjugation.

Suan Tuang1, Diomedes Dieppa-Matos, Chi Zhang

  • 1Massachusetts Institute of Technology, Department of Chemistry, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.

Chemical Communications (Cambridge, England)
|March 1, 2021
PubMed
Summary

This study introduces a rapid, catalyst-free method for site-selective protein modification using a nine-residue peptide interface. This cysteine-based approach achieves near-quantitative antibody labeling in cell lysate.

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Area of Science:

  • Biochemistry
  • Chemical Biology
  • Proteomics

Background:

  • Site-selective protein modification is crucial for biochemical and biomedical applications.
  • Existing methods often require catalysts, harsh conditions, or lack efficiency.

Purpose of the Study:

  • To develop a novel, efficient, and catalyst-free method for site-selective protein modification in aqueous conditions.
  • To demonstrate the utility of a reactive peptide interface for protein labeling.

Main Methods:

  • A nine-residue peptide interface was designed for reactive and site-selective protein modification.
  • The method utilizes a cysteine-based reaction mechanism.
  • Protein labeling was performed in aqueous buffer and cell lysate.

Main Results:

  • The developed peptide interface demonstrated the fastest reported catalyst-free, cysteine-based protein modification to date (152 M-1 s-1).
  • Near-quantitative labeling of antibodies was achieved in cell lysate.
  • The method operates under mild, aqueous conditions.

Conclusions:

  • The novel peptide interface provides a highly efficient and versatile tool for site-selective protein modification.
  • This method offers a significant advancement for antibody labeling and other proteomic applications.