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Silent Circuit Affects Metabolism in Escherichia coli K12

The bgl operon encodes proteins for the utilization of β‐glucoside sugars s such as salicin but is not expressed in wild‐type cells. Either the overexpression of LeuO or BglJ results in activation of bgl expression. However, both leuO and bglJ are silenced by the H‐NS protein as is the bgl operon. The retention of these genes provides a selective advantage against soil protozoa. In pathogenic bacteria, the bgl genes can be expressed but the activating signals are not known.