Abstract
The formation of C–C bonds in an enantioselective fashion to create complex polycyclic scaffolds in the hapalindole- and fischerindole- type alkaloids from Stigonematales cyanobacteria represents a compelling and urgent challenge in adapting microbial biosynthesis as a catalytic platform in drug development. Here we determine the biochemical basis for tri- and tetracyclic core formation in these secondary metabolites, involving a new class of cyclases that catalyze a complex cyclization cascade.
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Acknowledgements
The authors thank the National Science Foundation under the CCI Center for Selective C-H Functionalization (CHE-1205646), the National Institutes of Health (CA70375 to R.M.W. and D.H.S.), and the Hans W. Vahlteich Professorship (to D.H.S.) for financial support. We are grateful to S. Carmeli and A. Raveh (Tel Aviv University) for Fischerella sp. IL-199-3-1, and J. Orjala (University of Illinois at Chicago) for Fischerella sp. SAG 46.79.
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S.L. and D.H.S. designed the research. S.L. performed all experiments. A.N.L. synthesized the indole isonitrile. S.L., S.A.N., A.N.L. and D.H.S. conducted data analysis and interpretation. F.Y. performed bioinformatics analyses. S.L., A.N.L., D.H.S., and R.M.W. contributed to manuscript preparation.
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Supplementary information
Supplementary Text and Figures
Supplementary Results, Supplementary Tables 1–7 and Supplementary Figures 1–6 (PDF 1896 kb)
Dataset 1
Identity value table of Stig cyclases annotated from this study and public database, related to Supplementary Information_Figure 2 (PDF 1356 kb)
Supplementary Note
NMR Spectra (PDF 1564 kb)
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Li, S., Lowell, A., Newmister, S. et al. Decoding cyclase-dependent assembly of hapalindole and fischerindole alkaloids. Nat Chem Biol 13, 467–469 (2017). https://doi.org/10.1038/nchembio.2327
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DOI: https://doi.org/10.1038/nchembio.2327
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