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Production of Tyrian purple indigoid dye from tryptophan in Escherichia coli

Authors
Lee, JeongchanKim, JoonwonSong, Ji EunSong, Won-SukKim, Eun-JungKim, Yun-GonJeong, Hee-JinKim, Hye RimChoi, Kwon-YoungKim, Byung-Gee
Issue Date
Jan-2021
Publisher
Nature Research
Citation
NATURE CHEMICAL BIOLOGY, v.17, no.1, pp.104 - 112
Journal Title
NATURE CHEMICAL BIOLOGY
Volume
17
Number
1
Start Page
104
End Page
112
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/2428
DOI
10.1038/s41589-020-00684-4
ISSN
1552-4450
Abstract
Tyrian purple, mainly composed of 6,6'-dibromoindigo (6BrIG), is an ancient dye extracted from sea snails and was recently demonstrated as a biocompatible semiconductor material. However, its synthesis remains limited due to uncharacterized biosynthetic pathways and the difficulty of regiospecific bromination. Here, we introduce an effective 6BrIG production strategy in Escherichia coli using tryptophan 6-halogenase SttH, tryptophanase TnaA and flavin-containing monooxygenase MaFMO. Since tryptophan halogenases are expressed in highly insoluble forms in E. coli, a flavin reductase (Fre) that regenerates FADH(2) for the halogenase reaction was used as an N-terminal soluble tag of SttH. A consecutive two-cell reaction system was designed to overproduce regiospecifically brominated precursors of 6BrIG by spatiotemporal separation of bromination and bromotryptophan degradation. These approaches led to 315.0 mg l(-1) 6BrIG production from tryptophan and successful synthesis of regiospecifically dihalogenated indigos. Furthermore, it was demonstrated that 6BrIG overproducing cells can be directly used as a bacterial dye.
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생활과학대학 (의류학과)
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