fis
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For other uses, see Fis (disambiguation).
fis is the E. coli gene encoding FIS protein. The regulation of this gene is more complex than most other genes in the E. coli genome, as FIS is an important protein which regulates expression of other genes. It is supposed that fis is regulated by H-NS, IHF (protein) and CRP. It also regulates its own expression (autoregulation).
FIS buffers decrease of negative supercoiling in tyrT and rrnA expression. The upstream FIS binding site of rrnA is required for this and it's probable that FIS enables local DNA curvature. See Travers and Muskhelishvili 2005 for more detail.
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