Cascading Old Yellow Enzyme, Alcohol Dehydrogenase and Glucose Dehydrogenase for Selective Reduction of (E/Z)-Citral to (S)-Citronellol

نویسندگان

چکیده

Citronellol is a kind of unsaturated alcohol with rose-like smell and its (S)-enantiomer serves as an important intermediate for organic synthesis (-)-cis-rose oxide. Chemical methods are commonly used the citronellol (S)-enantiomer, which suffers from severe reaction conditions poor selectivity. Here, first one-pot double reduction (E/Z)-citral to (S)-citronellol was achieved in multi-enzymatic cascade system: N-ethylmaleimide reductase Providencia stuartii (NemR-PS) selected catalyze selective (S)-citronellal, dehydrogenase Yokenella sp. WZY002 (YsADH) performed further (S)-citronellal (S)-citronellol, meanwhile variant glucose Bacillus megaterium (BmGDHM6), together glucose, drove efficient NADPH regeneration. The Escherichia coli strain co-expressing NemR-PS, YsADH, BmGDHM6 successfully constructed whole-cell catalyst. Various factors were investigated achieving high conversion reducing accumulation by-products. 0.4 mM NADP+ essential maintaining catalytic activity, while feeding cells expressing effectively eliminated by-products shortened time. Under optimized conditions, bio-transformation 400 citral caused nearly complete (>99.5%) enantio-pure within 36 h, demonstrating promise industrial application.

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ژورنال

عنوان ژورنال: Catalysts

سال: 2021

ISSN: ['2073-4344']

DOI: https://doi.org/10.3390/catal11080931