The Gene yjfQ Encodes the Repressor of the yjfR-X Regulon ( ula ), Which Is Involved in l -Ascorbate Metabolism in Escherichia coli

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Abstract
Mutations in yjfQ allowed us to identify this gene as the regulator of the operon yjfS-X ( ula operon), reported to be involved in l -ascorbate metabolism. Inactivation of this gene renders constitutive the expression of the ula operon, indicating that YjfQ acts as a repressor. We also demonstrate that this repressor regulates the nearby yjfR gene, which in this way constitutes a regulon with the ula operon.