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Neubauer, P. R.; Pienkny, S.; Wessjohann, L. A.; Wessjohann, L.; Brandt, W.; Sewald, N.; Predicting the substrate scope of the flavin‐dependent halogenase BrvH ChemBioChem 21 3282–3288 (2020) DOI: 10.1002/cbic.202000444
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The recently described flavin‐dependent halogenase BrvH is able to catalyze both bromination and chlorination of indole, but shows significantly higher bromination activity. BrvH was annotated as a tryptophan halogenase, but does not accept tryptophan as a substrate. Its native substrate remains unknown. A predictive model with the data available for BrvH was analysed. A training set of compounds tested in vitro was docked into the active site of a complete protein model based on the X‐ray structure of BrvH. The atoms not resolved experimentally have been modelled using molecular mechanics force fields to obtain this protein model. Furthermore, docking poses for the substrates and known non‐substrates have been calculated. Parameters like distance, partial charge, and hybridization state have been analysed to derive rules for prediction of activity. With this model for activity of the BrvH, a virtual screening suggested several structures for potential substrates. Some of the thus preselected compounds were tested in vitro and several could be verified as convertible substrates. Based on information on halogenated natural products, a new dataset was created to specifically search for natural products as substrates/products, and virtual screening in this database yielded further hits.

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Sheludko, Y. V.; Volk, J.; Brandt, W.; Warzecha, H.; Expanding the diversity of plant monoterpenoid indole alkaloids employing human cytochrome P450 3A4 ChemBioChem 21 1976-1980 (2020) DOI: 10.1002/cbic.202000020
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Human drug‐metabolizing cytochrome P450 monooxygenases (CYPs) have enormous substrate promiscuity; this makes them promising tools for the expansion of natural product diversity. Here, we used CYP3A4 for the targeted diversification of a plant biosynthetic route leading to monoterpenoid indole alkaloids. In silico, in vitro and in planta studies proved that CYP3A4 was able to convert the indole alkaloid vinorine into vomilenine, the former being one of the central intermediates in the ajmaline pathway in the medicinal plant Rauvolfia serpentina (L.) Benth. ex Kurz. However, to a much larger extent, the investigated conversion yielded vinorine (19R ,20R)‐epoxide, a new metabolite with an epoxide functional group that is rare for indole alkaloids. The described work represents a successful example of combinatorial biosynthesis towards an increase in biodiversity of natural metabolites. Moreover, characterisation of the products of the in vitro and in planta transformation of potential pharmaceuticals with human CYPs might be indicative of the route of their conversion in the human organism.

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