Metabolic pathway optimization for biosynthesis of 1,2,4-butanetriol from xylose by engineered Escherichia coli
| Autor: | Jinbao Wang, Yang Zhang, Haijun Gao, Nannan Zhang |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
Butanols Bioengineering Xylose Biology medicine.disease_cause Applied Microbiology and Biotechnology Biochemistry 03 medical and health sciences chemistry.chemical_compound Biosynthesis Aldehyde Reductase medicine Escherichia coli Bioprocess Hydro-Lyases Escherichia coli Proteins Keto Acids Recombinant Proteins Biosynthetic Pathways Metabolic pathway 030104 developmental biology chemistry Metabolic Engineering Genes Bacterial 1 2 4-Butanetriol Xylonate dehydratase Oxidoreductases Biotechnology |
| Zdroj: | Enzyme and microbial technology. |
| ISSN: | 1879-0909 |
| Popis: | 1,2,4-Butanetriol (BT) and related derivatives have been widely used in many fields, especially in the military and in medicine. In this paper, we systematically optimized the BT biosynthetic pathway. We first investigated the activities of various NADH dependent aldehyde reductases (ALRs), which catalyze the fourth reaction in the four-step pathway for BT production from xylose in E. coli, and found that a combination of multiple endogenous enzymes catalyzed aldehyde reduction in the BT production bioprocess and that YqhD in E. coli was a main ALR for BT production. In addition, ADH2 from Saccharomyces cerevisiae can effectively catalyze 3,4-dihydroxybutanal to BT. Also, YjhG was identified as the major xylonate dehydratase and was co-overexpressed with YqhD, resulting in an improvement of BT production by 30%. Moreover, we identified and eliminated the competing branch pathway by inactivating 2-keto acid reductases (yiaE). Finally, the combination of these approaches led to BT production of 5.1g/L. In summary, our study provides insights into the biosynthetic pathway for BT production, demonstrates an effective strategy to enhance BT production, and paves the way toward in-depth research on BT biosynthesis. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect