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. 1991 Jun 15;88(12):5072–5076. doi: 10.1073/pnas.88.12.5072

A chimeric mammalian transactivator based on the lac repressor that is regulated by temperature and isopropyl beta-D-thiogalactopyranoside.

S B Baim 1, M A Labow 1, A J Levine 1, T Shenk 1
PMCID: PMC51813  PMID: 2052587

Abstract

LAP267 is a lacI activator protein (LAP) containing an insertion of the transcriptional activation domain of the herpes simplex virus virion protein 16 within the inducer-binding and dimerization domain of the lac repressor protein. LAP267 strongly induces expression in a conditional manner from a minimal simian virus 40 early promoter linked to lac operator sequences. LAP267 is temperature-sensitive, activating expression at 32 degrees C but not at 39.5 degrees C. It is allosterically regulated in a manner opposite that of wild-type lac repressor, in that LAP267 activity is rescued at the nonpermissive temperature by isopropyl beta-D-thiogalactopyranoside (IPTG). Stable mouse cell lines containing both the LAP267 gene and a LAP-inducible chloramphenicol acetyltransferase (CAT) reporter gene were readily established and exhibited up to a 1200-fold increase in CAT activity within 24 hr upon addition of IPTG. Thus, LAP267 is a powerful inducible switch in mammalian cells, imparting a regulatory stringency similar to that observed with lac repressor in Escherichia coli.

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Selected References

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