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Synthesis of Protein Bioconjugates via Cysteine-maleimide Chemistry
Published on: July 20, 2016
MccB-catalyzed C-terminal Thioesterification for Protein Bioconjugation.
1Department of Biochemistry, University of Wisconsin-Madison, Madison, WI, USA.
Current Protocols
|June 11, 2026
Summary
A new enzymatic system using MccB and a TeCH tag enables C-terminal protein thioesterification. This method expands protein bioconjugation strategies, including expressed protein ligation, for biological studies.
Area of Science:
- Biochemistry
- Molecular Biology
- Chemical Biology
Background:
- Protein bioconjugation is crucial for adding non-encoded functionalities to proteins.
- C-terminal protein α-thioesters are key intermediates for protein functionalization.
- Existing methods for thioester synthesis include chemical and intein-mediated approaches.
Purpose of the Study:
- To outline the application of the MccB/TeCH tag system for protein C-terminal thioesterification.
- To demonstrate the utility of MccB-generated thioesters in bioconjugation methods.
- To expand the versatility of protein functionalization techniques.
Main Methods:
- Utilizing an ATP-driven, MccB-catalyzed enzymatic system for thioester synthesis.
- Modifying target proteins with a thioesterification C-terminal handle (TeCH tag).
- Integrating MccB-generated thioesters with expressed protein ligation (EPL) and enzyme-catalyzed EPL.
Main Results:
- Successful C-terminal thioesterification of proteins using the MccB/TeCH tag system.
- Demonstrated compatibility of MccB-generated thioesters with EPL and enzyme-catalyzed EPL.
- Expanded scope and versatility in protein bioconjugation.
Conclusions:
- The MccB/TeCH tag system provides an efficient enzymatic route for protein C-terminal thioesterification.
- This system complements existing methods, offering enhanced flexibility for protein functionalization.
- The generated thioesters are valuable for advanced bioconjugation applications.
