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Targeting Cysteine Thiols for in Vitro Site-specific Glycosylation of Recombinant Proteins
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Evaluation of nanobodies engineered with extra-cysteines for site-specific functionalization
Huyen Thuc Tran Luong1, Urša Štrancar2, Xinyu Hu2
1National Cytometry Platform, Translational Medicine Operations Hub, Luxembourg Institute of Health, Esch-sur-Alzette, Luxembourg; Faculty of Science, Technology and Medicine, University of Luxembourg, Esch-sur-Alzette, Luxembourg.
Journal of Biotechnology
|April 1, 2026
Summary
Adding a single cysteine to nanobodies enhances labeling without compromising functionality. Introducing multiple cysteines, however, reduces reagent efficiency and sensitivity in flow and mass cytometry applications.
Area of Science:
- Bioconjugation Chemistry
- Protein Engineering
- Immunoreagent Development
Background:
- Antibody labeling is crucial for creating specific immunoreagents.
- Current methods can lead to heterogeneous samples and affect binder functionality.
- Site-specific labeling, like cysteine addition, is preferred.
Purpose of the Study:
- To evaluate the impact of introducing single or multiple cysteines into nanobodies for improved labeling.
- To assess the homogeneity and performance of cysteine-modified nanobodies in flow and mass cytometry.
Main Methods:
- Engineered nanobodies with single or multiple cysteine residues.
- Assessed nanobody yield and functionality post-modification.
- Evaluated labeling homogeneity and reagent performance in flow and mass cytometry.
Main Results:
- A single added cysteine did not impede nanobody yield or natural disulfide bonds.
- Multiple cysteines led to nanobody dimerization and varied functionalization degrees.
- Nanobodies with multiple cysteines showed significantly lower efficiency compared to single-cysteine variants.
Conclusions:
- Single cysteine addition is a viable strategy for site-specific nanobody labeling.
- Multiple cysteine introductions can negatively impact nanobody homogeneity and overall reagent efficiency.
- Optimizing cysteine placement is key for developing sensitive and functional nanobody-based reagents.
