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Tryptophan thiohydantoin derivatives (1–3) and tryptophan containing diketopeperazines (DKPs) (4–8) as substrates for CpaD. Schemes illustrating the regioselective prenylation of tryptophan thiohydantoins 1–3 (A) and tryptophan DKPs 4–8 by CpaD (B). HPLC assay demonstrating the conversion of tryptophan thiohydantoin 2 and Trp-Phe DKP 5 to the corresponding prenylated products by CpaD (C).
