In vitro production of cysteine from glucose
| العنوان: | In vitro production of cysteine from glucose |
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| المؤلفون: | Hironori Taniguchi, Makoto Imura, Yoshihiro Toya, Ryo Iwakiri, Kohsuke Honda, Kenji Okano, Yohei Hanatani |
| المصدر: | Applied Microbiology and Biotechnology. 103:8009-8019 |
| بيانات النشر: | Springer Science and Business Media LLC, 2019. |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | Applied Microbiology and Biotechnology, Cofactor, 03 medical and health sciences, Cysteine, 030304 developmental biology, chemistry.chemical_classification, 0303 health sciences, Cell-Free System, biology, 030306 microbiology, Thermophile, General Medicine, Recombinant Proteins, In vitro, Biosynthetic Pathways, Enzymes, Amino acid, Glucose, Enzyme, Biochemistry, chemistry, Yield (chemistry), biology.protein, Intracellular, Biotechnology |
| الوصف: | Cysteine is a commercially valuable amino acid with an increasing demand in the food, cosmetic, and pharmaceutical industries. Although cysteine is conventionally manufactured by extraction from animal proteins, this method has several problems, such as troublesome waste-water treatment and incompatibility with some dietary restrictions. Fermentative production of cysteine from plant-derived substrates is a promising alternative for the industrial production of cysteine. However, it often suffers from low product yield as living organisms are equipped with various regulatory systems to control the intracellular cysteine concentration at a moderate level. In this study, we constructed an in vitro cysteine biosynthetic pathway by assembling 11 thermophilic enzymes. The in vitro pathway was designed to be insensitive to the feedback regulation by cysteine and to balance the intra-pathway consumption and regeneration of cofactors. A kinetic model for the in vitro pathway was built using rate equations of individual enzymes and used to optimize the loading ratio of each enzyme. Consequently, 10.5 mM cysteine could be produced from 20 mM glucose through the optimized pathway. However, the observed yield and production rate of the assay were considerably lower than those predicted by the model. Determination of cofactor concentrations in the reaction mixture indicated that the inconsistency between the model and experimental assay could be attributed to the depletion of ATP and ADP, likely due to host-derived, thermo-stable enzyme(s). Based on these observations, possible approaches to improve the feasibility of cysteine production through an in vitro pathway have been discussed. |
| تدمد: | 1432-0614 0175-7598 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::57f451330306828b98d99a34e9b72f22 https://doi.org/10.1007/s00253-019-10061-4 |
| حقوق: | CLOSED |
| رقم الأكسشن: | edsair.doi.dedup.....57f451330306828b98d99a34e9b72f22 |
| قاعدة البيانات: | OpenAIRE |
Find this article in full text from Springer Verlag. | تدمد: | 14320614 01757598 |
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