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Title
Secretory production ofa betamannanase anda chitosanase using a Lactobacillus plantarum expression system
AuthorSak-Ubol, Suttipong ; Namvijitr, Peenida ; Pechsrichuang, Phornsiri ; Haltrich, Dietmar ; Nguyen, Thu-Ha ; Mathiesen, Geir ; Eijsink, Vincent G. H. ; Yamabhai, Montarop
Published in
Microbial Cell Factories, 2016, Vol. 15, page 81
Published2016
LanguageEnglish
Document typeJournal Article
Keywords (DE)nicht verfügbar
Keywords (EN)-Mannanase / Chitosanase / L. plantarum / pSIP / Alanine racemase / Secretion / Food-grade / Bacillus / Signal peptide / OmpA
URNurn:nbn:at:at-ubbw:3-2324 Persistent Identifier (URN)
DOI10.1186/s12934-016-0481-z 
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 The work is publicly available
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Secretory production ofa betamannanase anda chitosanase using a Lactobacillus plantarum expression system [2.78 mb]
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Abstract (German)

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Abstract (English)

Background:

Heterologous production of hydrolytic enzymes is important for green and white biotechnology since these enzymes serve as efficient biocatalysts for the conversion of a wide variety of raw materials into value-added products. Lactic acid bacteria are interesting cell factories for the expression of hydrolytic enzymes as many of them are generally recognized as safe and require only a simple cultivation process. We are studying a potentially foodgrade expression system for secretion of hydrolytic enzymes into the culture medium, since this enables easy harvesting and purification, while allowing direct use of the enzymes in food applications

Results:

We studied overexpression of a chitosanase (CsnA) and a -mannanase (ManB), from Bacillus licheniformis and Bacillus subtilis, respectively, in Lactobacillus plantarum, using the pSIP system for inducible expression. The enzymes were over-expressed in three forms: without a signal peptide, with their natural signal peptide and with the well-known OmpA signal peptide from Escherichia coli. The total production levels and secretion efficiencies of CsnA and ManB were highest when using the native signal peptides, and both were reduced considerably when using the OmpA signal. At 20 h after induction with 12.5 ng/mL of inducing peptide in MRS media containing 20 g/L glucose, the yields and secretion efficiencies of the proteins with their native signal peptides were 50 kU/L and 84 % for ManB, and 79 kU/L and 56 % for CsnA, respectively. In addition, to avoid using antibiotics, the erythromycin resistance gene was replaced on the expression plasmid with the alanine racemase (alr) gene, which led to comparable levels of protein production and secretion efficiency in a suitable, alr-deficient L. plantarum host.

Conclusions:

ManB and CsnA were efficiently produced and secreted in L. plantarum using pSIP-based expression vectors containing either an erythromycin resistance or the alr gene as selection marker.

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CC-BY-License (4.0)Creative Commons Attribution 4.0 International License