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• W2003453431 abstract "The histone-like dimeric HU protein of Escherichia coli is encoded by two closely related genes, hupA and hupB. We show here that expression from the single hupA promoter and from the three hupB promoters varies during growth phase. The weak hupB-P4 promoter is active immediately after dilution. Transcription of the hupA gene is activated early in logarithmic phase. A little later, at mid to late exponential phase, RNA originating at the hupB-P2 promoter is detected. The hupB-P3 promoter is activated last when the cells enter stationary phase. Although the hup mRNAs are unstable, the HU protein is very stable so that the variations in the mRNAs synthesis are reflected in the level of the two HU subunits and in the composition of HU dimers. Cells growing exponentially contain a mixture of homodimeric α2 and heterodimeric αβ but no β2 is detected. In stationary cells, the predominant form is the heterodimer αβ. The presence of the heterodimeric form is required for optimal survival of E. coli after prolonged starvation. The three forms of HU are not equivalent, since β2 is incapable of promoting formation of DNA supercoiling like αβ and α2 do. The putative roles of each form of HU are discussed." @default.
• W2003453431 created "2016-06-24" @default.
• W2003453431 creator A5065804693 @default.
• W2003453431 creator A5075150979 @default.
• W2003453431 date "1997-10-01" @default.
• W2003453431 modified "2023-10-10" @default.
• W2003453431 title "Variation in HU composition during growth of Escherichia coli: the heterodimer is required for long term survival" @default.
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• W2003453431 doi "https://doi.org/10.1006/jmbi.1997.1310" @default.
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