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Article Abstract
We have developed a generally applicable methodology for cysteine mutagenesis of nanobody (Nb) framework region serine residues. This strategy allows for subsequent labeling with thiol-reactive compounds without disrupting Nb antigen binding. We provide a protocol for production, labeling, and affinity determination of cysteine-engineered Nbs (cys-Nbs) with Alexa Fluor 488-maleimide and the mercury compound para-chloromercuribenzoic acid (PCMB). Alexa Fluor 488- and PCMB-labeled cys-Nbs can be used for immunofluorescence microscopy and experimental phasing in crystallography, respectively.
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