Journal
BIOTECHNOLOGY LETTERS
Volume 34, Issue 7, Pages 1275-1281Publisher
SPRINGER
DOI: 10.1007/s10529-012-0887-6
Keywords
Inducible heterologous expression; Lactobacillus brevis; Lactococcus lactis; S-layer protein
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Funding
- Universidad Nacional de Quilmes
- CAPES-SECyT [012-2006]
- Comision de Investigaciones Cientificas de la Provincia de Buenos Aires (CIC-BA)
- Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET)
- CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico)
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Prokaryotes commonly present outer cell wall structures composed of a crystalline array of proteinaceous subunits, known as surface layers (S-layers). The ORF encoding the S-layer protein (SlpA) of Lactobacillus brevis was cloned into Lactococcus lactis under the transcriptional control of the xylose-inducible expression system (XIES). SlpA was secreted into the extracellular medium, as determined by immunoblotting, and assays on the kinetics of SlpA production revealed that repression of the system with glucose did not require the depletion of xylose from the medium that allows transitory ORF expression. The successful use of XIES to express S-layer proteins in the versatile and generally recognized as safe species L. lactis opens new possibilities for an efficient production and isolation of SlpA S-layer protein for its various applications in biotechnology and importantly as an antigen-carrying vehicle.
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