Abstract
Capitalizing on the generic design principle of the tetracycline-responsive expression systems (1,2), many various transgene control modalities responsive to streptogramins (3), macrolides (4), and butyrolactones (5) have been constructed. All of these gene-regulation systems could be arranged in small-molecule-repressible off-type and small-molecule-inducible on-type configurations. Off-type systems consist of a transactivator and transactivator-dependent promoter. The transactivator is a fusion protein between a bacterial small-molecule-responsive transcription regulator and mammalian transactivation domain, e.g., Herpes simplex-derived VP16 (6). The transactivator-dependent promoter consists of transactivator-specific (tandem) operator modules placed upstream of a minimal eukaryotic promoter, e.g., the minimal version of the human cytomegalovirus immediate early promoter (PhCVMmin). Transactivator binding to cognate operators in the absence of regulating small molecules initiates promoter-dependent transcription, whereas promoter-transactivator interaction is abolished in the presence of adjusting molecules, as is transgene expression (Fig. 1 A). On-type systems harbor the same prokaryotic response regulator that operates as a transrepressor on cognate chimeric promoters in its native form or optionally fused to a eukaryotic repression domain, such as the Kruppel-associated box (KRAB) domain of the human kox-1 gene (7). Transrepressor-dependent promoters consist of transrepressor-specific (tandem) operators cloned downstream of desired constitutive promoters. In the absence of regulating molecules, transrepressor-operator binding blocks/silences promoter-driven transgene expression, whereas small molecules interfering with transrepressor-operator interaction induce promoter-specific transcription (Fig. 1 B).
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Kramer, B.P., Fussenegger, M. (2005). Transgene Control Engineering in Mammalian Cells. In: Smales, C.M., James, D.C. (eds) Therapeutic Proteins. Methods in Molecular Biology™, vol 308. Humana Press. https://doi.org/10.1385/1-59259-922-2:123
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DOI: https://doi.org/10.1385/1-59259-922-2:123
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