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Protein Modification via Bioorthogonal HS-BCN Ligation
1Department of Chemistry, State University of New York at Buffalo, Buffalo, NY, 14260-3000, USA.
The hydrazonyl sultone (HS)-bicyclo[6.1.0]non-4-yne (BCN) ligation enables precise protein modification. This bioorthogonal reaction is effective for labeling nanobodies and G protein-coupled receptors (GPCRs) in vitro and in live cells.
Area of Science:
- Biochemistry
- Chemical Biology
- Molecular Biology
Background:
- Bioorthogonal reactions are crucial for site-specific biomolecule labeling in living systems.
- The hydrazonyl sultone (HS)-bicyclo[6.1.0]non-4-yne (BCN) ligation offers rapid kinetics and stable aqueous performance.
Purpose of the Study:
- To detail experimental protocols for utilizing HS-BCN ligation.
- To demonstrate site-specific modification of a recombinant nanobody and a cell-surface G protein-coupled receptor (GPCR).
Main Methods:
- Genetic encoding of BCN-lysine (BCNK) into target proteins.
- Performing bioorthogonal modification on BCNK-encoded proteins.
- Characterizing reaction kinetics and selectivity.
Main Results:
- Successful site-specific modification of a nanobody in vitro.
- Effective labeling of GPCRs on live mammalian cell surfaces.
- Demonstrated robustness of BCN genetic encoding in proteins.
Conclusions:
- The HS-BCN ligation facilitates efficient protein modification with high selectivity.
- This method expands bioorthogonal chemistry applications for diagnostics and live-cell receptor studies.
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