Abstract
To engineer the substrate specificities of nonribosomal peptide synthetases (NRPS), we developed a method to display NRPS modules on M13 phages and select catalytically active adenylation (A) domains that would load azide functionalized substrate analogs to the neighboring peptidyl carrier protein (PCP) domains. Biotin conjugated difluorinated cyclooctyne was used for copper free cycloaddition with an azide substituted substrate attached to PCP. Biotin-labeled phages were selected by binding to streptavidin.
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