IUBMB Enzyme Nomenclature


Accepted name: 3-[(Z)-2-isocyanoethenyl]-1H-indole synthase

Reaction: (2S)-3-(1H-indol-3-yl)-2-isocyanopropanoate + 2-oxoglutarate + O2 = 3-[(Z)-2-isocyanoethenyl]-1H-indole + succinate + 2 CO2 + H2O

For diagram of reaction click here.

Glossary: (2S)-3-(1H-indol-3-yl)-2-isocyanopropanoate = L-tryptophan isonitrile

Other name(s): ambI3 (gene name); famH3 (gene name); L-tryptophan isonitrile desaturase/decarboxylase (3-[(Z)-2-isocyanoethenyl]-1H-indole-forming)

Systematic name: (2S)-3-(1H-indol-3-yl)-2-isocyanopropanoate,2-oxoglutarate:oxygen oxidoreductase (decarboxylating, 3-[(Z)-2-isocyanoethenyl]-1H-indole-forming)

Comments: The enzyme, characterized from the cyanobacterium Fischerella ambigua UTEX 1903, participates in the biosynthesis of hapalindole-type alkaloids. The enzyme catalyses an Fe2+, 2-oxoglutarate-dependent monooxygenation at C-3, which is followed by decarboxylation and dehydration, resulting in the generation of a cis C-C double bond. cf. EC, 3-[(E)-2-isocyanoethenyl]-1H-indole synthase.

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:


1. Hillwig, M.L., Zhu, Q. and Liu, X. Biosynthesis of ambiguine indole alkaloids in cyanobacterium Fischerella ambigua. ACS Chem. Biol. 9 (2014) 372-377. [PMID: 24180436]

2. Chang, W.C., Sanyal, D., Huang, J.L., Ittiamornkul, K., Zhu, Q. and Liu, X. In vitro stepwise reconstitution of amino acid derived vinyl isocyanide biosynthesis: detection of an elusive intermediate. Org. Lett. 19 (2017) 1208-1211. [PMID: 28212039]

[EC created 2018]

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