Biochemistry (Moscow)

, Volume 81, Issue 5, pp 481–490 | Cite as

Phylogenomic analysis identifies a sodium-translocating decarboxylating oxidoreductase in thermotogae

  • O. I. Klimchuk
  • D. V. Dibrova
  • A. Y. MulkidjanianEmail author


Bacterial sodium-dependent decarboxylases were the first enzymes exemplifying sodium-dependent bioenergetics. These enzyme complexes couple decarboxylation of organic acids with the export of sodium ions via a special membrane subunit. In 711 representative prokaryotic genomes, we have analyzed genomic neighborhoods of the genes that code the membrane subunit of sodium decarboxylases. In representatives of Thermotogae, the operons with the gene of this subunit lack the genes of subunits that perform non-oxidative decarboxylation. Instead, these operons contain the genes of alphaand delta-subunits of decarboxylating oxidoreductases of alpha-ketoacids. The genes of betaand gamma-subunits of the decarboxylating oxidoreductases were found within the genomes of respective Thermotogae species as separate, twogene operons. We suggest that the described two operons code together for sodium-translocating decarboxylating oxidoreductases capable of coupling oxidative decarboxylation of alpha-ketoacids with the export of sodium ions, which is a novel type of bioenergetic coupling.


sodium transport membrane bioenergetics comparative genomics phylogenetic analysis ferredoxin molecular evolution anaerobic bacteria 


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Copyright information

© Pleiades Publishing, Ltd. 2016

Authors and Affiliations

  • O. I. Klimchuk
    • 1
  • D. V. Dibrova
    • 2
  • A. Y. Mulkidjanian
    • 1
    • 2
    • 3
    Email author
  1. 1.School of Bioengineering and BioinformaticsLomonosov Moscow State UniversityMoscowRussia
  2. 2.Belozersky Institute of Physico-Chemical BiologyLomonosov Moscow State UniversityMoscowRussia
  3. 3.School of PhysicsOsnabrueck UniversityOsnabrueckGermany

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