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Crystal structure of a light-driven sodium pump. 2015
Ivan Gushchin, and
Vitaly Shevchenko, and
Vitaly Polovinkin, and
Kirill Kovalev, and
Alexey Alekseev, and
Ekaterina Round, and
Valentin Borshchevskiy, and
Taras Balandin, and
Alexander Popov, and
Thomas Gensch, and
Christoph Fahlke, and
Christian Bamann, and
Dieter Willbold, and
Georg Büldt, and
Ernst Bamberg, and
Valentin Gordeliy
1] Institut de Biologie Structurale, Université Grenoble Alpes, Grenoble, France. [2] Institut de Biologie Structurale, Centre National de la Recherche Scientifique, Grenoble, France. [3] Institut de Biologie Structurale, Commissariat à l'Énergie Atomique (CEA), Grenoble, France. [4] Laboratory for Advanced Studies of Membrane Proteins, Moscow Institute of Physics and Technology, Dolgoprudniy, Russia. [5] Institute of Complex Systems (ICS), ICS-6, Structural Biochemistry, Research Center Jülich, Jülich, Germany.
Recently, the first known light-driven sodium pumps, from the microbial rhodopsin family, were discovered. We have solved the structure of one of them, Krokinobacter eikastus rhodopsin 2 (KR2), in the monomeric blue state and in two pentameric red states, at resolutions of 1.45 Å and 2.2 and 2.8 Å, respectively. The structures reveal the ion-translocation pathway and show that the sodium ion is bound outside the protein at the oligomerization interface, that the ion-release cavity is capped by a unique N-terminal α-helix and that the ion-uptake cavity is unexpectedly large and open to the surface. Obstruction of the cavity with the mutation G263F imparts KR2 with the ability to pump potassium. These results pave the way for the understanding and rational design of cation pumps with new specific properties valuable for optogenetics.
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Nature,
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Georg Büldt, and
Ernst Bamberg, and
Valentin Gordeliy
May 2009,
Nature,
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Kirill Kovalev, and
Alexey Alekseev, and
Ekaterina Round, and
Valentin Borshchevskiy, and
Taras Balandin, and
Alexander Popov, and
Thomas Gensch, and
Christoph Fahlke, and
Christian Bamann, and
Dieter Willbold, and
Georg Büldt, and
Ernst Bamberg, and
Valentin Gordeliy
December 1979,
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