To maximize a desired product, metabolic engineers typically express enzymes to high, constant levels. Yet, permanent pathway activation can have undesirable consequences including competition with essential pathways and accumulation of toxic intermediates. Faced with similar challenges, natural metabolic systems compartmentalize enzymes into organelles or post-translationally induce activity under certain conditions. Here we report that optogenetic control can be used to extend compartmentalization and dynamic control to engineered metabolisms in yeast. We describe a suite of optogenetic tools to trigger assembly and disassembly of metabolically active enzyme clusters. Using the deoxyviolacein biosynthesis pathway as a model system, we find that light-switchable clustering can enhance product formation six-fold and product specificity 18-fold by decreasing the concentration of intermediate metabolites and reducing flux through competing pathways. Inducible compartmentalization of enzymes into synthetic organelles can thus be used to control engineered metabolic pathways, limit intermediates and favor the formation of desired products.
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All plasmids, strains and raw data will be made available upon reasonable request to the corresponding authors.
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We thank all members of the Toettcher and Avalos laboratories for helpful comments. We also thank J. Dueber for kindly providing violacein enzyme plasmids. This work was supported by the Maeder Graduate Fellowship in Energy and the Environment (to E.M.Z.), NIH grant DP2EB024247 (to J.E.T.) and The Pew Charitable Trusts, the U.S. DOE Office of Biological and Environmental Research, Genomic Science Program Award DESC0019363, and NSF CAREER Award CBET-1751840 (to J.L.A.) and a Schmidt Transformative Technology grant (to J.E.T. and J.L.A).
Some of the authors are co-inventors on patent applications harnessing optogenetics for metabolic engineering (J.L.A., J.E.T. and E.M.Z.: patent application no. WO2017177147A1) and establishing optogenetic control of protein clustering (J.E.T.: patent application no. US20170355977A1).
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Supplementary Tables 1 and 2, Supplementary Figures 1–11, Supplementary Note 1
OptoDroplet formation and dissociation in S. cerevisiae.
OptoCluster formation and dissociation in S. cerevisiae.
PixELL formation and dissociation in S. cerevisiae.
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Zhao, E.M., Suek, N., Wilson, M.Z. et al. Light-based control of metabolic flux through assembly of synthetic organelles. Nat Chem Biol 15, 589–597 (2019). https://doi.org/10.1038/s41589-019-0284-8
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