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Originally published as Biophys J. BioFAST on September 7, 2007.
doi:10.1529/biophysj.107.112318
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Biophysical Journal 93:3872-3883 (2007)
© 2007 The Biophysical Society

This is an Open Access article distributed under the terms of the Creative Commons-Attribution Noncommercial License (http://creativecommons.org/licenses/by-nc/2.0/), which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Mrs2p Forms a High Conductance Mg2+ Selective Channel in Mitochondria

Rainer Schindl *, Julian Weghuber {dagger}, Christoph Romanin * and Rudolf J. Schweyen {dagger}

* Institute for Biophysics, University of Linz, Linz, Austria; and {dagger} Max F. Perutz Laboratories, Department of Genetics, University of Vienna, Vienna, Austria

Correspondence: Address reprint requests to Christoph Romanin, University of Linz, Linz, Austria. Tel.: 4373224689272; E-mail: christoph.romanin{at}jku.at; or to Rudolf J. Schweyen, MFPL, University of Vienna, Vienna, Austria. Tel.: 431427754604; E-mail: rudolf.schweyen{at}univie.ac.at.

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.




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J. Payandeh, C. Li, M. Ramjeesingh, E. Poduch, C. E. Bear, and E. F. Pai
Probing Structure-Function Relationships and Gating Mechanisms in the CorA Mg2+ Transport System
J. Biol. Chem., April 25, 2008; 283(17): 11721 - 11733.
[Abstract] [Full Text] [PDF]


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