Metal-citrate complex transport in Kineococcus radiotolerans

Brian P. Huta, Nigel H. Miller, Eleanor L. Robertson, Robert P. Doyle

Research output: Contribution to journalArticlepeer-review


The growth of an organism is highly dependent on the acquisition of carbon and metals, and availability of these nutrients in the environment affects its survival. Organisms can obtain both nutrients simultaneously through proteins of the CitMHS superfamily. Bioinformatic studies suggested a CitMHS gene (Accession number ABS03965.1) in Kineococcus radiotolerans. Radio flux assays following 14-C radiolabelled citrate, either free or complexed to a variety of metal ions, in K. radiotolerans demonstrated internalization of the citrate when bound to select metal ions only, primarily in the form of calcium-citrate. A pH response was also observed, consistent with a permease (ATP independent) mechanism as noted for other CitMHS family members, with greater uptake at pH 7 compared to pH 10. These results confirm the ability of K. radiotolerans to transport complexed citrate.

Original languageEnglish (US)
Pages (from-to)209-216
Number of pages8
JournalJournal of Basic Microbiology
Issue number3
StatePublished - Mar 2018


  • CitMHS
  • metal-citrate complex
  • symport

ASJC Scopus subject areas

  • Applied Microbiology and Biotechnology


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