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Stringent regulation of stably integrated chloramphenicol acetyl transferase genes by E. coli lac repressor in monkey cells.

Abstract：

:Monkey cell lines that constitutively synthesize 38.6 kd lac repressor protein and bear stably integrated chloramphenicol acetyl transferase (CAT) genes linked to a lac operator-containing SV40 early promoter-enhancer were generated. When grown in medium containing isopropyl beta-D-thiogalactoside (IPTG), these cells acquired a CAT+ phenotype. In contrast, when grown in parallel in medium lacking IPTG, the cells remained CAT-. Maximum induction of CAT activity occurred after 4 days of IPTG exposure. Three days after removal of IPTG, induced cells had reverted to CAT-. Specific CAT activity increased up to 60-fold after induction, while background activity in uninduced cells was similar to or only slightly above that of parental, CAT- cells. CAT activity increased stepwise over a wide range of IPTG concentrations. Thus lac repressor-operator complexes can form on primate chromosomes and stringently block transcription from an adjoining promoter.

journal_name

Cell

journal_title

Cell

authors

Figge J,Wright C,Collins CJ,Roberts TM,Livingston DM

doi

10.1016/0092-8674(88)90409-6

subject

Has Abstract

pub_date

1988-03-11 00:00:00

pages

713-22

issue

5

eissn

0092-8674

issn

1097-4172

pii

0092-8674(88)90409-6

journal_volume

52

pub_type

杂志文章

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