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We report a high-throughput phage selection method to identify mutants of Sfp phosphopantetheinyl transferase with altered substrate specificities from a large library of the Sfp enzyme. In this method, Sfp and its peptide substrates are co-displayed on the M13 phage surface as fusions to the phage capsid protein pIII. Phage-displayed Sfp mutants that are active with biotin-conjugated coenzyme A (CoA)...