Terpenes have many applications and are widely found in
nature, but recent progress in synthetic biology has enabled
the use of microorganisms as chassis cells for the synthesis
of these compounds. Candida glycerinogenes (C. glycerinogenes)
is an industrial strain that may be developed as a chassis
for the synthesis of terpenes since it has a tolerance to hyperosmolality
and high sugar, and has a complete mevalonate
(MVA) pathway. However, monoterpenes such as pinene are
highly toxic, and the tolerance of C. glycerinogenes to pinene
was investigated. We also measured the content of mevalonate
and squalene to evaluate the strength of the MVA pathway.
To determine terpene synthesis capacity, a pathway for the synthesis
of pinene was constructed in C. glycerinogenes. Pinene
production was improved by overexpression, gene knockdown
and antisense RNA inhibition. Pinene production was mainly
enhanced by strengthening the upstream MVA pathway and
inhibiting the production of by-products from the downstream
pathway. With these strategies, yield could be increased
by almost 16 times, to 6.0 mg/L. Overall, we successfully constructed
a pinene synthesis pathway in C. glycerinogenes and
enhanced pinene production through metabolic modification.
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