Biosynthesis of ambiguine indole alkaloids in cyanobacterium Fischerella ambigua.
ACS Chem Biol
; 9(2): 372-7, 2014 Feb 21.
Article
en En
| MEDLINE
| ID: mdl-24180436
ABSTRACT
Ambiguines belong to a family of hapalindole-type indole alkaloid natural products, with many of the members possessing up to eight consecutive carbon stereocenters in a fused pentacyclic 6-6-6-5-7 ring scaffold. Here, we report the identification of a 42 kbp ambiguine (amb) biosynthetic gene cluster that harbors 32 protein-coding genes in its native producer Fischerella ambigua UTEX1903. Association of the amb cluster with ambiguine biosynthesis was confirmed by both bioinformatic analysis and in vitro characterizations of enzymes responsible for 3-((Z)-2'-isocyanoethenyl) indole and geranyl pyrophosphate biosynthesis and a C-2 indole dimethylallyltransferase that regiospecifically tailors hapalindole G to ambiguine A. The presence of five nonheme iron-dependent oxygenase coding genes (including four Rieske-type oxygenases) within the amb cluster suggests late-stage C-H activations are likely responsible for the structural diversities of ambiguines by regio- and stereospecific chlorination, hydroxylation, epoxidation, and sp(2)-sp(3) C-C bond formation.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Cianobacterias
/
Alcaloides Indólicos
Idioma:
En
Revista:
ACS Chem Biol
Año:
2014
Tipo del documento:
Article
País de afiliación:
Estados Unidos