Mechanistic Investigation of Oxidative Decarboxylation Catalyzed by Two Iron(II)- and 2‑Oxoglutarate-Dependent Enzymes
Two non-heme iron enzymes, IsnB and AmbI3, catalyze a novel decarboxylation-assisted olefination to produce indole vinyl isonitrile, an important building block for many natural products. Compared to other reactions catalyzed by this enzyme family, decarboxylation-assisted olefination represents an...
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Veröffentlicht in: | Biochemistry (Easton) 2018-03, Vol.57 (12), p.1838-1841 |
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Hauptverfasser: | , , , , , , , |
Format: | Artikel |
Sprache: | eng |
Online-Zugang: | Volltext |
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Zusammenfassung: | Two non-heme iron enzymes, IsnB and AmbI3, catalyze a novel decarboxylation-assisted olefination to produce indole vinyl isonitrile, an important building block for many natural products. Compared to other reactions catalyzed by this enzyme family, decarboxylation-assisted olefination represents an attractive biosynthetic route and a mechanistically unexplored pathway in constructing a CC bond. Using mechanistic probes, transient state kinetics, reactive intermediate trapping, spectroscopic characterizations, and product analysis, we propose that both IsnB and AmbI3 initiate stereoselective olefination via a benzylic C–H bond activation by an Fe(IV)–oxo intermediate, and the reaction likely proceeds through a radical- or carbocation-induced decarboxylation to complete CC bond installation. |
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ISSN: | 0006-2960 1520-4995 |
DOI: | 10.1021/acs.biochem.8b00115 |