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Related Concept Videos

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Glutathione, a tripeptide made up of glutamate, cysteine, and glycine, is a critical player in the detoxification of drugs and xenobiotics via a process known as glutathione conjugation or mercapturic acid formation. This phase II biotransformation reaction involves the covalent binding of glutathione to a drug or its metabolite, enhancing the compound's water solubility and enabling its excretion.
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Proteins are involved in several cellular processes and biochemical reactions. Analyzing a specific protein of interest requires it to be isolated from the other proteins in the cell. This is achieved by overexpressing the specific gene in a suitable host to produce large quantities of the target protein. A tag or label is recombined with the gene to produce a fusion protein containing the target protein and the tag. The tags on these fusion proteins can then be used for easy detection and...
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Phase II reactions are essential for the detoxification and elimination of drugs from the body. These reactions involve the conjugation of parent drugs or their phase I metabolites with endogenous molecules, resulting in more hydrophilic drug conjugates. The primary conjugation reactions in this phase are sulfation and glucuronidation. Both sulfation and glucuronidation typically produce biologically inactive metabolites. However, in some cases involving prodrugs, active metabolites may be...
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Simple proteins and protein complexes contain only amino acids. In contrast, many other proteins, called conjugated proteins, covalently bond with non-protein moieties.
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Related Experiment Video

Updated: Jan 5, 2026

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Transglutaminase-Mediated Conjugations.

Yasuaki Anami1, Kyoji Tsuchikama2

  • 1Texas Therapeutics Institute, The Brown Foundation Institute of Molecular Medicine, The University of Texas Health Science Center at Houston, Houston, TX, USA.

Methods in Molecular Biology (Clifton, N.J.)
|October 24, 2019
PubMed
Summary

Microbial transglutaminase (MTGase) enables precise antibody conjugation for homogeneous antibody-drug conjugates (ADCs). This cost-effective method allows flexible linker incorporation and payload installation for research and clinical applications.

Keywords:
AntibodiesAntibody–drug conjugatesCancerChemotherapyConjugationHomogeneousLinkerPayloadSite-specificTransglutaminase

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Area of Science:

  • Bioconjugation Chemistry
  • Protein Engineering
  • Immunology

Background:

  • Antibody-drug conjugates (ADCs) are crucial therapeutics requiring precise drug attachment for efficacy and safety.
  • Current ADC production methods often yield heterogeneous products, complicating analysis and potentially impacting therapeutic profiles.
  • Site-specific conjugation strategies are needed to improve ADC homogeneity and control drug-to-antibody ratios (DAR).

Purpose of the Study:

  • To present an optimized protocol for microbial transglutaminase (MTGase)-mediated linker incorporation into antibodies.
  • To demonstrate the facile conjugation of both linear and branched linkers for homogeneous ADC generation.
  • To enable cost-effective production of homogeneous ADCs with defined DARs for research and clinical use.

Main Methods:

  • Utilized microbial transglutaminase (MTGase) for site-specific transpeptidation between linkers and antibody glutamine residues.
  • Employed antibody engineering, including N297 mutation and peptide tag insertion, to facilitate MTGase conjugation.
  • Integrated click chemistry for subsequent payload installation onto the incorporated linkers.

Main Results:

  • Achieved homogeneous antibody-drug conjugates (ADCs) with defined drug-to-antibody ratios (DARs) using both small linear and bulky branched linkers.
  • Demonstrated successful linker incorporation into the Fc moiety of various antibody types.
  • Showcased the ability to analyze the homogeneous ADCs using standard single-quadrupole ESI mass spectrometry.

Conclusions:

  • The MTGase-mediated conjugation approach offers a versatile and efficient method for producing homogeneous ADCs.
  • This protocol facilitates flexible linker and payload integration, enabling tailored ADC design.
  • The cost-effectiveness and accessibility of the method support its application in both research and clinical settings for antibody conjugate development.