Creating a Selective Nanobody Against 3-Nitrotyrosine Containing Proteins

Area of Science:

• Biochemistry
• Molecular Biology
• Immunology

Background:

• Oxidative stress contributes to various pathologies.
• Identifying specific oxidized protein modifications is crucial for therapeutic development.
• Current methods for detecting oxidative post-translational modifications (oxPTMs) have limitations.

Purpose of the Study:

• To develop a technology for creating selective nanobodies (Nbs) against specific oxPTMs.
• To demonstrate the utility of genetic code expansion (GCE) in producing antigens for Nb selection.
• To generate an Nb that specifically recognizes a modified protein in the context of oxidative stress.

Main Methods:

• Utilized genetic code expansion (GCE) to synthesize site-specific 3-nitrotyrosine (nitroTyr) modified 14-3-3 protein.
• Employed the synthesized modified protein as an antigen for nanobody selection.
• Screened and characterized nanobodies for selective binding to the nitroTyr modification.

Main Results:

• Successfully generated a nanobody (Nb) with high selectivity for the 3-nitrotyrosine (nitroTyr) modified 14-3-3 protein.
• The developed Nb showed reduced recognition of nitroTyr modifications in other protein contexts.
• This proof-of-concept demonstrates the feasibility of GCE-assisted Nb development for oxPTMs.

Conclusions:

• Genetic code expansion (GCE) is an effective strategy for producing homogeneous, site-specific oxPTM-containing proteins required for nanobody development.
• This approach enables the creation of highly specific nanobodies targeting unique oxidative post-translational modifications.
• The developed anti-nitroTyr Nb and the GCE methodology pave the way for novel diagnostic and therapeutic strategies in oxidative stress-related diseases.