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Engineering an oleic acid-induced system for Halomonas, E. coli and Pseudomonas.
- Source :
-
Metabolic Engineering . Jul2022, Vol. 72, p325-336. 12p. - Publication Year :
- 2022
-
Abstract
- Ligand-induced system plays an important role for microbial engineering due to its tunable gene expression control over timings and levels. An oleic acid (OA)-induced system was recently constructed based on protein FadR, a transcriptional regulator involved in fatty acids metabolism, for metabolic control in Escherichia coli. In this study, we constructed a synthetic FadR-based OA-induced systems in Halomonas bluephagenesis by hybridizing the porin promoter core region and FadR-binding operator (fadO). The dynamic control range was optimized over 150-fold, and expression leakage was significantly reduced by tuning FadR expression and positioning fadO , forming a series of OA-induced systems with various expression strengths, respectively. Additionally, ligand orthogonality and cross-species portability were also studied and showed highly linear correlation among Halomonas spp. , Escherichia coli and Pseudomonas spp. Finally, OA-induced systems with medium- and small-dynamic control ranges were employed to dynamically control the expression levels of morphology associated gene minCD , and monomer precursor 4-hydroxybutyrate-CoA (4HB-CoA) synthesis pathway for polyhydroxyalkanoates (PHA), respectively, in the presence of oleic acid as an inducer. As a result, over 10 g/L of poly-3-hydroxybutyrate (PHB) accumulated by elongated cell sizes, and 6 g/L of P(3HB- co -9.57 mol% 4HB) were obtained by controlling the dose and induction time of oleic acid only. This study provides a systematic approach for ligand-induced system engineering, and demonstrates an alternative genetic tool for dynamic control of industrial biotechnology. • Transcriptional factor FadR-based oleic acid-induced system was firstly constructed in Halomonas bluephagenesis. • Series of oleic acid-induced systems with various dynamic control ranges and species portability were achieved. • The oleic acid-induced systems were employed in cell morphology engineering and P34HB synthesis dynamic control. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10967176
- Volume :
- 72
- Database :
- Academic Search Index
- Journal :
- Metabolic Engineering
- Publication Type :
- Academic Journal
- Accession number :
- 157330162
- Full Text :
- https://doi.org/10.1016/j.ymben.2022.04.003