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From Tryptophan to Toxin: Nature's Convergent Biosynthetic Strategy to Aetokthonotoxin.
- Source :
-
Journal of the American Chemical Society [J Am Chem Soc] 2022 Feb 23; Vol. 144 (7), pp. 2861-2866. Date of Electronic Publication: 2022 Feb 10. - Publication Year :
- 2022
-
Abstract
- Aetokthonotoxin (AETX) is a cyanobacterial neurotoxin that causes vacuolar myelinopathy, a neurological disease that is particularly deadly to bald eagles in the United States. The recently characterized AETX is structurally unique among cyanotoxins and is composed of a pentabrominated biindole nitrile. Herein we report the discovery of an efficient, five-enzyme biosynthetic pathway that the freshwater cyanobacterium Aetokthonos hydrillicola uses to convert two molecules of tryptophan to AETX. We demonstrate that the biosynthetic pathway follows a convergent route in which two functionalized indole monomers are assembled and then reunited by biaryl coupling catalyzed by the cytochrome P450 AetB. Our results revealed enzymes with novel biochemical functions, including the single-component flavin-dependent tryptophan halogenase AetF and the iron-dependent nitrile synthase AetD.
Details
- Language :
- English
- ISSN :
- 1520-5126
- Volume :
- 144
- Issue :
- 7
- Database :
- MEDLINE
- Journal :
- Journal of the American Chemical Society
- Publication Type :
- Academic Journal
- Accession number :
- 35142504
- Full Text :
- https://doi.org/10.1021/jacs.1c12778