Some pathogens make fimbriae to attach to cells lining the g…
Some pathogens make fimbriae to attach to cells lining the gut of their host. However, it would be a waste of resources to make fimbriae when not in the gut. In some bacteria, fimbrial gene transcription is initiated when the cell detects leucine, which would likely be abundant in a nutrient‐rich environment like a gut. The fimbriae (fim) genes are under positive control, wherein a regulatory protein (FRP) binds to an activator‐binding site when leucine is present In which scenario does transcription occur?
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