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Volume 160, Issue 7

A Na-coupled C-dicarboxylate transporter (Asuc_0304) and aerobic growth of on C-dicarboxylates Free

Abstract

, which is known to produce large amounts of succinate during fermentation of hexoses, was able to grow on C-dicarboxylates such as fumarate under aerobic and anaerobic conditions. Anaerobic growth on fumarate was stimulated by glycerol and the major product was succinate, indicating the involvement of fumarate respiration similar to succinate production from glucose. The aerobic growth on C-dicarboxylates and the transport proteins involved were studied. Fumarate was oxidized to acetate. The genome of encodes six proteins with similarity to secondary C-dicarboxylate transporters, including transporters of the Dcu (C-dicarboxylate uptake), DcuC (C-dicarboxylate uptake C), DASS (divalent anion : sodium symporter) and TDT (tellurite resistance dicarboxylate transporter) family. From the cloned genes, Asuc_0304 of the DASS family protein was able to restore aerobic growth on C-dicarboxylates in a C-dicarboxylate-transport-negative strain. The strain regained succinate or fumarate uptake, which was dependent on the electrochemical proton potential and the presence of Na. The transport had an optimum pH ~7, indicating transport of the dianionic C-dicarboxylates. Transport competition experiments suggested substrate specificity for fumarate and succinate. The transport characteristics for C-dicarboxylate uptake by cells of aerobically grown were similar to those of Asuc_0304 expressed in , suggesting that Asuc_0304 has an important role in aerobic fumarate uptake in . Asuc_0304 has sequence similarity to bacterial Na-dicarboxylate cotransporters and contains the carboxylate-binding signature. Asuc_0304 was named SdcA (odium-coupled C-iarboxylate transporter from . ).

  • Received:
  • Accepted:
  • Published Online:
Funding
This study was supported by the:
  • National Research Foundation of Korea (Award NRF-2010-0025404)
  • Deutsche Forschungsgemeinschaft (Award UN49/12-2)
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2014-07-01
2024-04-19
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A Na+-coupled C4-dicarboxylate transporter (Asuc_0304) and aerobic growth of Actinobacillus succinogenes on C4-dicarboxylates
Microbiology 160, 1533 (2014); https://doi.org/10.1099/mic.0.076786-0
/content/journal/micro/10.1099/mic.0.076786-0
/content/journal/micro/10.1099/mic.0.076786-0
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