Anaerobic growth of Escherichia coli on D-tartrate depends on the fumarate carrier DcuB and fumarase, rather than the L-tartrate carrier TtdT and L-tartrate dehydratase

Ok Bin Kim, Sebastian Lux, Gottfried Unden

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

Escherichia coli is able to grow under anaerobic conditions on d-tartrate when glycerol is supplied as an electron donor (d-tartrate fermentation). d-Tartrate was converted to succinate. Growth was lost in strains deficient for DcuB, the fumarate/succinate antiporter of fumarate respiration. The l-tartrate/succinate antiporter TtdT of l-tartrate fermentation, or the C 4-dicarboxylate carriers DcuA and DcuC, were not able to support d-tartrate transport and fermentation. Deletion of fumB demonstrated, that fumarase B is required for growth on d-tartrate. The mutant lost most (about 79%) of d-tartrate dehydratase activity. l-Tartrate dehydratase (TtdAB), and fumarase A or C, showed no or only a small contribution to d-tartrate dehydratase activity. Therefore d-tartrate is metabolised by a sequence of reactions analogous to that from l-tartrate fermentation, including dehydration to oxaloacetate, which is then converted to malate, fumarate and succinate. The stereoisomer specific carrier TtdT and dehydratase TtdAB of l-tartrate fermentation are substituted by enzymes from general anaerobic fumarate metabolism, the antiporter DcuB and fumarase B, which have a broader substrate specificity. No d-tartrate specific carriers and enzymes are involved in the pathway.

Original languageEnglish
Pages (from-to)583-589
Number of pages7
JournalArchives of Microbiology
Volume188
Issue number6
DOIs
StatePublished - Dec 2007

Keywords

  • D-Tartrate fermentation
  • DcuB
  • Fumarase
  • Fumarate respiration
  • L-Tartrate fermentation
  • Tartrate carrier
  • Tartrate dehydratase

Fingerprint

Dive into the research topics of 'Anaerobic growth of Escherichia coli on D-tartrate depends on the fumarate carrier DcuB and fumarase, rather than the L-tartrate carrier TtdT and L-tartrate dehydratase'. Together they form a unique fingerprint.

Cite this