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- W2082830529 abstract "Caulobacter crescentus flagellar (fla, flb, or flg) genes are periodically expressed in the cell cycle and they are organized in a regulatory hierarchy. We have analyzed the genetic interactions required for fla gene expression by determining the effect of mutations in 30 known fla genes on transcription from four operons in the hook gene cluster. These results show that the flaO (transcription unit III) and flbF (transcription unit IV) operons are located at or near the top of the hierarchy. They also reveal an extensive network of negative transcriptional controls that are superimposed on the positive regulatory cascade described previously. The strong negative autoregulation observed for the flaN (transcription unit I), flbG (transcription unit II), and flaO (transcription unit III) promoters provides one possible mechanism for turning off fla gene expression at the end of the respective synthetic periods. We suggest that these positive and negative transcriptional interactions are components of genetic switches that determine the sequence in which fla genes are turned on and off in the C. crescentus cell cycle." @default.
- W2082830529 created "2016-06-24" @default.
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- W2082830529 date "1989-09-01" @default.
- W2082830529 modified "2023-09-27" @default.
- W2082830529 title "Genetic switching in the flagellar gene hierarchy of Caulobacter requires negative as well as positive regulation of transcription." @default.
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- W2082830529 doi "https://doi.org/10.1073/pnas.86.17.6651" @default.
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