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Development of a secretory expression system with high compatibility between expression elements and an optimized host for endoxylanase production in Corynebacterium glutamicum
- Source :
- Microbial Cell Factories, Microbial Cell Factories, Vol 18, Iss 1, Pp 1-10 (2019)
- Publication Year :
- 2019
- Publisher :
- BioMed Central, 2019.
-
Abstract
- Background In terms of protein production, the internal environment of the host influences the activity of expression elements, thus affecting the expression level of the target protein. Native expression elements from a specific strain always function well in the original host. In the present study, to enhance the endoxylanase (XynA) production level in Corynebacterium glutamicum CGMCC1.15647 with its native expression elements, approaches to reduce host expression obstacles and to promote expression were evaluated. Results We identified the signal peptide of CspB2 in C. glutamicum CGMCC1.15647 by MALDI-TOF and applied it along with its promoter for the production of endoxylanase (XynA) in this strain. The native cspB2 promoter and cspB2 signal peptide are superior to the well-used cspB1 promoter and cspA signal peptide for XynA expression in C. glutamicum CGMCC1.15647, and expression in this strain is superior to the expression in C. glutamicum ATCC13032. The highest XynA secretion efficiency level in deep 24-well plates level (2492.88 U/mL) was achieved by disruption of the cell wall protein CspB2 and the protease ClpS, chromosomal integration of xynA and coexisting plasmid expression, which increased expression 11.43- and 1.35-fold compared to that of chromosomal expression and pXMJ19-xynA-mediated expression in the original strain, respectively. In fed-batch cultivation, the highest XynA accumulation (1.77 g/L) was achieved in the culture supernatant after 44 h of cultivation. Conclusion Adaptation between the expression elements and the host is crucial for XynA production in C. glutamicum CGMCC1.15647. Strategies including host optimization, chromosomal integration, and coexistence of plasmids were useful for efficient protein production in C. glutamicum. Electronic supplementary material The online version of this article (10.1186/s12934-019-1116-y) contains supplementary material, which is available to authorized users.
- Subjects :
- 0106 biological sciences
Signal peptide
medicine.medical_treatment
lcsh:QR1-502
ClpS
Bioengineering
Protein Sorting Signals
01 natural sciences
Applied Microbiology and Biotechnology
lcsh:Microbiology
Corynebacterium glutamicum
03 medical and health sciences
Plasmid
Endoxylanase
Coexisting plasmids
Bacterial Proteins
010608 biotechnology
medicine
Protein biosynthesis
Chromosomal expression
Promoter Regions, Genetic
030304 developmental biology
0303 health sciences
Protease
Endo-1,4-beta Xylanases
Strain (chemistry)
Chemistry
Research
Cell biology
Metabolic Engineering
bacteria
Target protein
Function (biology)
Biotechnology
Plasmids
Subjects
Details
- Language :
- English
- ISSN :
- 14752859
- Volume :
- 18
- Database :
- OpenAIRE
- Journal :
- Microbial Cell Factories
- Accession number :
- edsair.doi.dedup.....ac253d83f2ee13913a6636f6197955db