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Proc Natl Acad Sci U S A. 2002 Oct 15;99(21):13413-8. Epub 2002 Oct 7.

Structure and function in rhodopsin: a tetracycline-inducible system in stable mammalian cell lines for high-level expression of opsin mutants.

Author information

1
Departments of Biology and Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.

Abstract

Tetracycline-inducible HEK293S stable cell lines have been prepared that express high levels (up to 10 mg/liter) of WT opsin and its mutants only in response to the addition of tetracycline and sodium butyrate. The cell lines were prepared by stable transfection of HEK293S-TetR cells with expression plasmids that contained the opsin gene downstream of a cytomegalovirus promoter containing tetO sequences as well as the neomycin resistance gene under control of the weak H(2)L(d) promoter. The inducible system is particularly suited for overcoming problems with toxicity either due to the addition of toxic compounds, for example, tunicamycin, to the growth medium or due to the expressed protein products. By optimization of cell growth conditions in a bioreactor, WT opsin, a constitutively active opsin mutant, E113Q/E134Q/M257Y, presumed to be toxic to the cells, and nonglycosylated WT opsin obtained by growth in the presence of tunicamycin have been prepared in amounts of several milligrams per liter of culture medium.

PMID:
12370422
PMCID:
PMC129687
DOI:
10.1073/pnas.212519199
[Indexed for MEDLINE]
Free PMC Article

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