Fermentative production and direct extraction of (-)-?-bisabolol in metabolically engineered Escherichia coli.

ABSTRACT: (-)-?-Bisabolol, also known as levomenol, is an unsaturated sesquiterpene alcohol that has mainly been used in pharmaceutical and cosmetic products due to its anti-inflammatory and skin-soothing properties. (-)-?-Bisabolol is currently manufactured mainly by steam-distillation of the essential oils extracted from the Brazilian candeia tree that is under threat because its natural habitat is constantly shrinking. Therefore, microbial production of (-)-?-bisabolol plays a key role in the development of its sustainable production from renewable feedstock.Here, we created an Escherichia coli strain producing (-)-?-bisabolol at high titer and developed an in situ extraction method of (-)-?-bisabolol, using natural vegetable oils. We expressed a recently identified (-)-?-bisabolol synthase isolated from German chamomile (Matricaria recutita) (titer: 3 mg/L), converted the acetyl-CoA to mevalonate, using the biosynthetic mevalonate pathway (12.8 mg/L), and overexpressed farnesyl diphosphate synthase to efficiently supply the (-)-?-bisabolol precursor farnesyl diphosphate. Combinatorial expression of the exogenous mevalonate pathway and farnesyl diphosphate synthase enabled a dramatic increase in (-)-?-bisabolol production in the shake flask culture (80 mg/L) and 5 L bioreactor culture (342 mg/L) of engineered E. coli harboring (-)-?-bisabolol synthase. Fed-batch fermentation using a 50 L fermenter was conducted after optimizing culture conditions, resulting in efficient (-)-?-bisabolol production with a titer of 9.1 g/L. Moreover, a green, downstream extraction process using vegetable oils was developed for in situ extraction of (-)-?-bisabolol during fermentation and showed high yield recovery (>98%).The engineered E. coli strains and economically viable extraction process developed in this study will serve as promising platforms for further development of microbial production of (-)-?-bisabolol at large scale.

SUBMITTER: Han GH 

PROVIDER: S-EPMC5101696 | biostudies-literature | 2016 Nov

REPOSITORIES: biostudies-literature