Transcription of the uropathogenic Escherichia coli vat gene is driven by multiple promoters whose activity is modulated by the cyclic AMP receptor protein.

In UPEC Escherichia coli CFT073, CRP binding to the vat regulatory region drives a complex, multi-promoter control where P1 is CRP-activated but P2 and P3 are CRP-suppressed.

• Why it matters: UPEC must regulate virulence gene transcription to infect and persist despite host defenses, yet how global regulators like CRP tune vat expression is unclear.
• What they did: The study mapped CRP binding and promoter architecture in the vat regulatory region using in vivo and in vitro analyses, identifying functional -10 and -35 elements for P2 and transcript-start effects for P3.
• The result: Net vat promoter activity is not dependent on CRP because CRP blocks P2’s -35 element and suppresses P3 expression by binding over the transcript start site.

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