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- W2000624819 abstract "Transcription termination at the ilvB attenuator of Escherichia coli K-12 has been quantitated by measuring the in vivo rate of synthesis and degradation of mRNA segments proximal and distal to the attenuator. This analysis demonstrates that a 4-fold deattenuation results in vivo when the growth of cells is limited by the availability of valine or leucine. The result suggests that attenuation is the major mechanism by which this operon is regulated by these end-product amino acids. On the basis of possible secondary structures of ilvB leader RNA, we predicted that attenuation of this operon should also be affected by growth of cells in limiting amounts of alanine or threonine. We report here that the ilvB operon is deattenuated when cells are starved for either of these amino acids. A rationale for the regulation of this operon by these four amino acids, which represent both the substrates and the products of the ilvB gene product, and by catabolite repression is presented." @default.
- W2000624819 created "2016-06-24" @default.
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- W2000624819 date "1984-01-01" @default.
- W2000624819 modified "2023-09-23" @default.
- W2000624819 title "Attenuation of the ilvB operon by amino acids reflecting substrates or products of the ilvB gene product." @default.
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- W2000624819 doi "https://doi.org/10.1073/pnas.81.1.76" @default.
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