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- W3215459857 abstract "Cyclodipeptide synthases (CDPSs) are a growing family of enzymes capable of producing a large variety of cyclodipetide products using aminoacylated tRNA. Histidine-containing cyclic dipeptides have important biological activities as anticancer and neuroprotective molecules. Out of the 120 experimentally validated CDPS members, only two are known to accept histidine as a substrate. Here, we studied the activities of both Para-CDPS from Parabacteroides sp. 20_3 and Parcu-CDPS from Parcubacteria bacterium RAAC4_OD1_1 which synthesise cyclo(His-Phe) and cyclo(His-Pro) respectively. Both enzymes accepted canonical and non-canonical amino acids as substrates to generate a library of novel molecules. In order to understand the substrate selectivity of these CDPSs, the crystal structure of Parcu-CDPS was solved (alongside a number of mutants) and the role of residues important for catalysis and histidine recognition were probed using mutagenesis. Three successive generations of mutants containing both single and double residue substitutions were generated leading to a change in substrate selectivity from histidine to phenylalanine and leucine. The research detailed herein is the first instance of successful engineering of a CDPS to yield different products, paving the way to direct the promiscuity of these enzymes to produce molecules of our choosing." @default.
- W3215459857 created "2021-12-06" @default.
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- W3215459857 date "2021-11-30" @default.
- W3215459857 modified "2023-09-30" @default.
- W3215459857 title "Structural-based engineering expands the substrate scope of a cyclodipeptide synthase" @default.
- W3215459857 doi "https://doi.org/10.26434/chemrxiv-2021-8rm54" @default.
- W3215459857 hasPublicationYear "2021" @default.
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