Mrs2p Forms a High Conductance Mg2+ Selective Channel in Mitochondria

Members of the CorA-Mrs2-Alr1 superfamily of Mg2+ transporters are ubiquitous among pro- and eukaryotes. The crystal structure of a bacterial CorA protein has recently been solved, but the mode of ion transport of this protein family remained obscure. Using single channel patch clamping we unequivocally show here that the mitochondrial Mrs2 protein forms a Mg2+-selective channel of high conductance (155 pS). It has an open probability of ∼60% in the absence of Mg2+ at the matrix site, which decreases to ∼20% in its presence. With a lower conductance (∼45 pS) the Mrs2 channel is also permeable for Ni2+, whereas no permeability has been observed for either Ca2+, Mn2+, or Co2+. Mutational changes in key domains of Mrs2p are shown either to abolish its Mg2+ transport or to change its characteristics toward more open and partly deregulated states. We conclude that Mrs2p forms a high conductance Mg2+ selective channel that controls Mg2+ influx into mitochondria by an intrinsic negative feedback mechanism.

• Publication year

  2007

• Venue

  Biophysical Journal

• Publication date

  2007-09-07

• Fields of study

  Biology, Medicine, Chemistry

• Identifiers
  DOI 10.1529/biophysj.107.112318PMID 17827224PMCID 2099211
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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