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. 2023 Jan 12;169(1):001283. doi: 10.1099/mic.0.001283

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© 2023 The Authors

This is an open-access article distributed under the terms of the Creative Commons Attribution License. This article was made open access via a Publish and Read agreement between the Microbiology Society and the corresponding author’s institution.

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Fig. 7. — The Fis binding regions in fimS and in the bacteriophage λ prophage. (a) A summary of the DNA sequences of the LRP-1 and LRP-2 binding sites (blue) in fimS, showing that the LRP-2 (blue italics) site is nested completely within the Fis binding site (red/crimson). (b) The three binding sites for the λ Xis excisionase, X1, X1.5 and X2 (blue) are shown. The Fis site (red/crimson) overlaps the X2 site completely. Despite the superficial similarity of the nested relationships of the LRP-2 and Fis sites in fimS, and the X2 and Fis sites in λ, the interactions between the proteins in each system differ: in fimS, Fis competes with Lrp for access to the Fis binding site, whereas Fis and Xis bind cooperatively to the phage DNA in the λ prophage.