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ThedcuC gene ofEscherichia coli encodes an alternative C4 -dicarboxylate carrier (DcuC) with low transport activity. The expression ofdcuC was investigated.dcuC was expressed only under anaerobic conditions; nitrate and fumarate caused slight repression and stimulation of expression, respectively. Anaerobic induction depended mainly on the transcriptional regulator FNR. Fumarate stimulation was independent of the fumarate response regulator DcuR. The expression ofdcuC was not significantly inhibited by glucose, assigning a role to DcuC during glucose fermentation. The inactivation ofdcuC increased fumarate-succinate exchange and fumarate uptake by DcuA and DcuB, suggesting a preferential function of DcuC in succinate efflux during glucose fermentation. Upon overexpression in adcuC promoter mutant (dcuC *), DcuC was able to compensate for DcuA and DcuB in fumarate-succinate exchange and fumarate uptake.

Functioning of DcuC as the C 4 -Dicarboxylate Carrier during Glucose Fermentation by Escherichia coli

Functioning of DcuC as the C ₄ -Dicarboxylate Carrier during Glucose Fermentation by Escherichia coli