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. 2023:2676:21-40.
doi: 10.1007/978-1-0716-3251-2_2.

Engineering Homogeneous Photoactive Antibody Fragments

Thomas Bridge  1 , Amit Sachdeva  2
Affiliations

Engineering Homogeneous Photoactive Antibody Fragments

Thomas Bridge et al. Methods Mol Biol. 2023.

Abstract

Genetically encoded site-specifically incorporated noncanonical amino acids (ncAAs) have been used to modulate properties of several proteins. Here, we describe a procedure for engineering photoactive antibody fragments that bind to their target antigen only after irradiation with 365 nm light. The procedure starts with identification of tyrosine residues in antibody fragments that are important for antibody-antigen binding and thus targets for replacement with photocaged tyrosine (pcY). This is followed by cloning of plasmids and expression of pcY-containing antibody fragments in E. coli. Finally, we describe a cost-effective and biologically-relevant method for measuring the binding affinity of photoactive antibody fragments to antigens expressed on the surface of live cancer cells.

Keywords: Antibodies; Cancer; Genetic code expansion; Light-activated biotherapeutics; Noncanonical amino acids; Photocaged amino acids; Synthetic biology.

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