Abstract
Escherichia coli, a well-known prokaryotic organism, has been widely employed as a versatile host for heterologous overexpression of proteins/biocatalysts and the production of pharmaceutically important intermediates/small molecules. However, some E. coli endogenous enzymes showing substrate promiscuity may disturb the heterologous metabolic flux, which will result in the reduction of substrates, intermediates, and target products. Here we reported an unexpected E. coli-catalyzed regioselective O-acetylation of various glucosides. The regioselectively O-acetylated products, 6′-O-acetyl-loganin and 6′-O-acetyl-loganic acid, were obtained and characterized from the enzymatic reaction in which the supernatants of E. coli expressing either CaCYP72A565 and CaCPR, the key enzymes involved in camptothecin biosynthesis, or empty vector were used as catalyst and loganin and loganic acid as independent substrate. An alkaloidal glucoside strictosamide was converted into the regioselectively O-acetylated product 6′-O-acetyl-strictosamide, implying substrate promiscuity of the E. coli-catalyzed O-acetylation reaction. Furthermore, 8 glucosides, including 5 iridoid glucosides and 3 flavonoid glucosides, were successfully converted into the regioselectively O-acetylated products by E. coli, indicating the wide substrate range for the unexpected E. coli-catalyzed O-acetylation. E. coli maltose O-acetyltransferase was demonstrated to be responsible for the mentioned regioselective O-acetylation at the 6-OH of the glucopyranosyl group of multiple classes of natural product glucosides through candidate acetyltransferase-encoding gene analysis, gene knock-out, gene complementation, and the relevant enzymatic reaction activity assays. The present study not only provides an efficient biocatalyst for regioselective O-acetylation but also notifies cautions for metabolic engineering and synthetic biology applications in E. coli.
Graphical abstract
Key points
• 6-OH of glucosyl of multiple glucosides was regioselectively O-acetylated by E. coli.
• Endogenous EcMAT is responsible for the regioselective O-acetylation reaction.
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Data availability
The authors declare that the data supporting the findings of this study are available within the paper and its Supplementary Data files. Should any raw data files be needed in another format they are available from the corresponding author upon reasonable request.
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Funding
This work was supported in part by the National Natural Science Foundation of China (22177112), the Natural Science Foundation of Sichuan Province (2022NSFC0616), the Biological Resources Programme, the Chinese Academy of Sciences (KFJ-BRP-008), and the CAS Key Laboratory of Environmental and Applied Microbiology & Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences (KLEAMCAS202301).
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YL conceived and designed research. YLi, XW, ZL, YY, LJ, ZL, XQ, and XP conducted the experiments. YLi, YY, XP, and YL analyzed the data. YLi, YY, and YL wrote the manuscript. All authors read and approved the manuscript.
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Li, Y., Wang, X., Liu, Z. et al. Regioselective O-acetylation of various glucosides catalyzed by Escherichia coli maltose O-acetyltransferase. Appl Microbiol Biotechnol 107, 7031–7042 (2023). https://doi.org/10.1007/s00253-023-12790-z
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DOI: https://doi.org/10.1007/s00253-023-12790-z