Corynebacterium glutamicum as a platform strain for the production of a broad variety of terpenoids

Conference Dates

July 14-18, 2019


Corynebacterium glutamicum is a natural carotenoid producing bacterium used in the million-ton-scale amino acid biotechnology that has been engineered for isoprenoid production1. The native membrane-bound carotenoid decaprenoxanthin is a rare C50 carotenoid. Volatile terpenoids such as valencene2 and patchoulol3 could be produced upon deletion of the first step of the specific carotenoid pathway and heterologous expression of the FPP synthase gene ispA from E. coli and terpene synthases from plant origin. However, these strains produced a yet unidentified carotenoid and only when all carotenoid biosynthetic genes were deleted, a colorless strain resulted. Expressing a codon optimized ADS from Artemisia annua in the white strain, amorphadiene, the volatile precursor for artemisinin was produced. For production of volatile terpenoids a dodecane overlay was used, a condition in which C. glutamicum benefits from its robust myco-membrane. Recently, we showed production of membrane-bound carotenoids with different length and/or cyclization status: bicyclic C50 sarcinaxanthin4, bicyclic C40 astaxanthin5, the linear lycopene6 and the linear C50 bisanhydrobacterioruberin7. This indicated that the C. glutamicum myco-membrane accepts these linear and bicyclic carotenoids.

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