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• W456191 startingPage "973" @default.
• W456191 abstract "We tested the effect of systematic destruction of all three lac operators of the chromosomal lac operon of Escherichia coli on repression by Lac repressor. Absence of just one 'pseudo-operator' O2 or O3 decreases repression by wild-type tetrameric Lac repressor approximately 2- to 3-fold; absence of both 'pseudo-operators' decreases repression greater than 50-fold. O1 alone represses under these conditions only approximately 20-fold. Dimeric active Lac repressor (iadi) represses the wild-type lac operon to about the same low extent. This indicates that cooperative interaction between lac operators is due to DNA loop formation mediated by tetrameric Lac repressor. Under conditions where loop formation is impossible, occupation of O3 but not of O2 may lead to weak repression. This suggests that under these conditions CAP activation may be inhibited and that stopping transcription at O2 does not significantly contribute to repression." @default.
• W456191 created "2016-06-24" @default.
• W456191 creator A5000339271 @default.
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• W456191 date "1990-04-01" @default.
• W456191 modified "2023-10-18" @default.
• W456191 title "The three operators of the lac operon cooperate in repression." @default.
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• W456191 doi "https://doi.org/10.1002/j.1460-2075.1990.tb08199.x" @default.
• W456191 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/551766" @default.
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