Respiratory complex i from Escherichia coli does not transport Na+ in the absence of its NuoL subunit

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Abstract

We investigated H+ and Na+ transport by complex I from Escherichia coli devoid of the NuoL subunit, which is probably part of the ion translocating machinery. We observed that complex I devoid of the NuoL subunit still translocates H+, although to a smaller extension than the complete version of complex I, but does not transport Na+. Our results unequivocally reinforce the observation that E. coli complex I transports Na+ in the opposite direction to that of the H+ and show that NuoL subunit is involved in the translocation of both ions by complex I.

Original languageEnglish
Pages (from-to)4520-4525
Number of pages6
JournalFEBS Letters
Volume588
Issue number23
DOIs
Publication statusPublished - 28 Nov 2014

Keywords

  • Hydrogenases
  • Ion translocation
  • Membrane proteins
  • Na/H antiporter
  • Respiratory chains

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