FEMS Microbiol Lett. 2017 Feb 21. doi: 10.1093/femsle/fnx044. [Epub ahead of print]

A tetracycline inducible integrative expression system for Streptococcus pneumoniae.

Meiers M1, Laux A1, Eichinger D1, Sexauer A1, Marx P1, Bertram R2,3, Brückner R1.

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Abstract

Inducible gene expression systems are very useful to analyze cellular processes. The ability to switch the expression state of genes of interest may even be crucial if essential traits or genetic instability are involved. An integrative plasmid, pTEX2, was designed using the (anhydro)tetracycline-inducible promoter Pxyl/tet from staphylococcal plasmid pRAB11 to control gene expression in Streptococcus pneumoniae. The system was evaluated by expressing genes of the two-component regulatory system ciaRH of S. pneumoniae. With full induction of Pxyl/tet, wild type levels of the response regulator CiaR were obtained, while the uninduced basal expression was low. Hyperactive variants of the kinase gene ciaH normally causing pronounced genetic instability could be handled without any problems upon cloning into pTEX2. Therefore, the expression system is well suited to express physiological levels of proteins in S. pneumoniae and also to aid regulatory studies.

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KEYWORDS:

Streptococcus pneumoniae; integrative plasmid; tetracycline inducible expression; two-component regulatory system CiaRH

PMID: 28333198 DOI: 10.1093/femsle/fnx044