Journal
BIOTECHNOLOGY AND BIOENGINEERING
Volume 111, Issue 11, Pages 2280-2289Publisher
WILEY
DOI: 10.1002/bit.25297
Keywords
glycerol; tryptophan; C-13 flux; L-arabinose; natural product; deoxyviolacein
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Funding
- German Academic Exchange Service [A/08/71658]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
- Max-Buchner Foundation of the DECHEMA [KZ2924]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico - CNPq, Brazil
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Deoxyviolacein is a microbial drug with biological activity against tumors, gram-positive bacteria, and fungal plant pathogens. Here, we describe an Escherichia coli strain for heterologous production of this high-value drug from glycerol. Plasmid-based expression of the deoxyviolacein cluster vioABCE was controlled by the araBAD promoter and induction by L-arabinose. Through elimination of L-arabinose catabolism in E. coli, the pentose sugar could be fully directed to induction of deoxyviolacein biosynthesis and was no longer metabolized, as verified by C-13 isotope experiments. Deletion of the araBAD genes beneficially complemented with previously described (i) engineering of the pentose phosphate pathway, (ii) chorismate biosynthesis, (iii) tryptophan biosynthesis, (iv) improved supply of L-serine, (v) elimination of tryptophan repression, and (vi) of tryptophan catabolism. Subsequent screening of the created next-generation producer E. coli dVio-8 identified glycerol as optimum carbon source and a level of 100 mg L-1 of L-arabinose as optimum for induction. Transferred to a glycerol-based fed-batch process, E. coli dVio-8 surpassed the gram scale and produced 1.6 g L-1 deoxyviolacein. With straightforward extraction from culture broth and purification by flash chromatography, deoxyviolacein was obtained at >99.5% purity. (C) 2014 Wiley Periodicals, Inc.
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