Journal of Bacteriology, November 1998, p. 5855-5859, Vol. 180, No. 22
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Department of Molecular Cell Physiology, Faculty of Biology, Free University, Amsterdam, The Netherlands,1 and Department of Microbiology, Technical University of Denmark, Lyngby, Denmark2
Received 1 June 1998/Accepted 5 September 1998
Escherichia coli atp mutants, which lack a functional
H+-ATPase complex, are capable of growth on glucose but not
on succinate or other C4-dicarboxylates (Suc
phenotype). Suc+ revertants of an atp deletion
strain were isolated which were capable of growth on succinate even
though they lack the entire H+-ATPase complex.
Complementation in trans with the yhiF gene
suppressed the growth of the Suc+ mutants on succinate,
which implicates the yhiF gene product in the regulation of
C4-dicarboxylate metabolism. Indeed, when the E. coli C4-dicarboxylate transporter (encoded by the
dctA gene) was expressed in trans, the
Suc
phenotype of the atp deletion strain
reverted to Suc+, which shows that the reason why the
E. coli atp mutant is unable to grow aerobically on
C4-dicarboxylates is insufficient transport capacity for
these substrates.
This paper is dedicated to the memory of Lars Boe.
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