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Updated: Jan 23, 2026
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Sequence-specific Labeling of Nucleic Acids and Proteins with Methyltransferases and Cofactor Analogues
Published on: November 22, 2014
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Site-Specific Antibody Labeling Using Phosphopantetheinyl Transferase-Catalyzed Ligation
Jan Grünewald1, Ansgar Brock2, Bernhard H Geierstanger2
1Biotherapeutics, Genomics Institute of the Novartis Research Foundation, San Diego, CA, USA. jgrunewald@gnf.org.
Methods in Molecular Biology (Clifton, N.J.)
|June 5, 2019
Summary
4'-Phosphopantetheinyl transferases (PPTases) are versatile biocatalysts for creating homogeneous antibody-drug conjugates (ADCs). These enzymes enable efficient site-specific protein modification for novel anticancer drug development.
Area of Science:
- Biochemistry
- Chemical Biology
- Protein Engineering
Background:
- Antibody-drug conjugates (ADCs) are advanced therapeutics for cancer treatment.
- Site-specific protein modification is crucial for developing homogeneous ADCs.
- 4 -Phosphopantetheinyl transferases (PPTases) are enzymes with broad substrate specificity.
Purpose of the Study:
- To detail the use of PPTases for synthesizing homogeneous antibody-drug conjugates (ADCs).
- To provide protocols for both one-step and two-step conjugation strategies.
- To guide researchers on enzyme and substrate preparation for ADC production.
Main Methods:
- Utilizing the broad substrate tolerance of PPTases for protein labeling.
- Implementing one-step conjugation: direct antibody-drug coupling.
- Implementing two-step conjugation: antibody labeling with a bioorthogonal handle followed by drug attachment.
Main Results:
- Demonstrated PPTase versatility for site-specific modification of proteins.
- Established efficient one-step and two-step conjugation strategies for ADC synthesis.
- Provided detailed protocols and guidance for enzyme and substrate preparation.
Conclusions:
- PPTases are powerful biocatalysts for producing homogeneous ADCs.
- The described methods offer flexibility and efficiency in ADC development.
- These protocols facilitate the advancement of innovative anticancer therapeutics.
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