Canna~Fangled Abstracts

Δ9-Tetrahydrocannabinolic acid synthase: the application of a plant secondary metabolite enzyme in biocatalytic chemical synthesis.

By June 28, 2016 No Comments
2016 Jun 28. pii: S0168-1656(16)31365-7. doi: 10.1016/j.jbiotec.2016.06.022. [Epub ahead of print]

Abstract

PM 1aΔ9-Tetrahydrocannabinolic acid synthase (THCAS) from the secondary metabolism of Cannabis sativa L. catalyzes the oxidative formation of an intramolecular C-C bond in cannabigerolic acid (CBGA) to synthesize Δ9-tetrahydrocannabinolic acid (THCA), which is the direct precursor of Δ9-tetrahydrocannabinol (Δ9-THC). Aiming on a biotechnological production of cannabinoids, we investigated the potential of the heterologously produced plant oxidase in a cell-free system on preparative scale. THCAS was characterized in an aqueous/organic two-liquid phase setup in order to solubilize the hydrophobic substrate and to allow in situ product removal. Compared to the single phase aqueous setup the specific activity decreased by a factor of approximately 2 pointing to a substrate limitation of CBGA in the two-liquid phase system. However, the specific activity remained stable for at least 3h illustrating the benefit of the two-liquid phase setup. In a repeated-batch setup, THCAS showed only a minor loss of specific activity in the third batch pointing to a high intrinsic stability and high solvent tolerance of the enzyme. Maximal space-time-yields of 0.121g L-1 h-1 were reached proving the two-liquid phase concept suitable for biotechnological production of cannabinoids.
Copyright © 2016. Published by Elsevier B.V.

KEYWORDS:

biocatalysis; cannabinoids; natural product synthesis; oxidase; two liquid phase setup

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