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submitted on 30.10.2019 and posted on 05.11.2019by Sabine Duewel, Luca Schmermund, Tabea Faber, Klaus Harms, Vasundara Srinivasan, Eric Meggers, Sabrina Hoebenreich
By using structure-guided directed evolution, the substrate scope of the FeII and a‑ketoglutarate dependent halogenase Wi‑WelO15 from Westiella intricata HT-29-1 was engineered to enable chemo-, regio- and diastereoselective chlorination of unactivated C(sp3)-H bonds using NaCl as chlorine source. While FeII dependent enzymes are often oxygen sensitive, variants of this halogenase could be screened in lysates under aerobic conditions. The new biocatalysts offer a sustainable approach for mild, late-stage chlorination on mg-scale of non-natural hapalindoles containing a ketone instead of an isonitrile functionality, thereby unlocking them for preparative biocatalysis.