The LsrA promoter can be blocked by Lsrr protein, so they are not expressed in normal condition. Only when the signal molecule AI-2 exists can it bind to lsrr and change its conformation so that gene expression is no longer suppressed and can function normally.
All the genes linked to the T7 promoter could be expressed under suitable conditions .What’s more, the intensity of gene expression increases can be higher.
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