Genetically engineered biosynthetic pathways for nonnatural C60 carotenoids using C5 -elongases and C50 -cyclases in Escherichia coli

Scientific Reports
Ling LiDaisuke Umeno

Abstract

While the majority of the natural carotenoid pigments are based on 40-carbon (C40) skeleton, some carotenoids from bacteria have larger C50 skeleton, biosynthesized by attaching two isoprene units (C5) to both sides of the C40 carotenoid pigment lycopene. Subsequent cyclization reactions result in the production of C50 carotenoids with diverse and unique skeletal structures. To produce even larger nonnatural novel carotenoids with C50 + C5 + C5 = C60 skeletons, we systematically coexpressed natural C50 carotenoid biosynthetic enzymes (lycopene C5-elongases and C50-cyclases) from various bacterial sources together with the laboratory-engineered nonnatural C50-lycopene pathway in Escherichia coli. Among the tested enzymes, the elongases and cyclases from Micrococcus luteus exhibited significant activity toward C50-lycopene, and yielded the novel carotenoids C60-flavuxanthin and C60-sarcinaxanthin. Moreover, coexpression of M. luteus elongase with Corynebacterium cyclase resulted in the production of C60-sarcinaxanthin, C60-sarprenoxanthin, and C60-decaprenoxanthin.

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Citations

Jan 8, 2020·Metabolic Engineering Communications·Cheng LiAnthony J Sinskey

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Methods Mentioned

BETA
PCR
nuclear magnetic resonance
NMR

Software Mentioned

RBS calculator

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