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. 1992 Jul 1;89(13):5892–5896. doi: 10.1073/pnas.89.13.5892

Fumarase C, the stable fumarase of Escherichia coli, is controlled by the soxRS regulon.

S I Liochev 1, I Fridovich 1
PMCID: PMC49403  PMID: 1631070

Abstract

Fumarase C was strongly induced by paraquat in a parental strain of Escherichia coli but was not induced in a strain lacking the soxRS response. Moreover, a strain that constitutively expresses the soxRS regulon contained more fumarase C than did the parental strain. The Mn-containing superoxide dismutase and glucose-6-phosphate dehydrogenase, members of the soxRS regulon, were similarly induced by paraquat. Mutational defects in glucose-6-phosphate dehydrogenase increased the induction of fumarase C by paraquat. For Mn-containing superoxide dismutase, responsiveness to paraquat was also enhanced in the glucose-6-phosphate dehydrogenase-defective strains. Overproduction of the Mn-containing superoxide dismutase, elicited by isopropyl beta-D-thiogalactoside in a tac-sodA fusion strain, did not diminish induction of fumarase C or of glucose-6-phosphate dehydrogenase by paraquat, and induction of these enzymes was more sensitive to paraquat when the cells were growing on succinate rather than on LB medium. These results indicate that fumarase C is a member of the soxRS regulon and that this regulon does not respond to changes in O2- concentration but perhaps does respond to some consequence of a decrease in the ratio of NADPH to NADP+.

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Selected References

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