Volume 56, Issue 12 pp. 3369-3373
Communication

Solid-state NMR and EPR Spectroscopy of Mn2+-Substituted ATP-Fueled Protein Engines

Dr. Thomas Wiegand

Dr. Thomas Wiegand

Physical Chemistry, ETH Zurich, 8093 Zurich, Switzerland

These authors contributed equally to this work.

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Denis Lacabanne

Denis Lacabanne

Molecular Microbiology and Structural Biochemistry, Labex Ecofect, UMR 5086 CNRS/Université de Lyon, 69367 Lyon, France

These authors contributed equally to this work.

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Katharina Keller

Katharina Keller

Physical Chemistry, ETH Zurich, 8093 Zurich, Switzerland

These authors contributed equally to this work.

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Riccardo Cadalbert

Riccardo Cadalbert

Physical Chemistry, ETH Zurich, 8093 Zurich, Switzerland

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Dr. Lauriane Lecoq

Dr. Lauriane Lecoq

Molecular Microbiology and Structural Biochemistry, Labex Ecofect, UMR 5086 CNRS/Université de Lyon, 69367 Lyon, France

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Dr. Maxim Yulikov

Dr. Maxim Yulikov

Physical Chemistry, ETH Zurich, 8093 Zurich, Switzerland

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Dr. Laurent Terradot

Corresponding Author

Dr. Laurent Terradot

Molecular Microbiology and Structural Biochemistry, Labex Ecofect, UMR 5086 CNRS/Université de Lyon, 69367 Lyon, France

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Prof. Gunnar Jeschke

Corresponding Author

Prof. Gunnar Jeschke

Physical Chemistry, ETH Zurich, 8093 Zurich, Switzerland

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Prof. Beat H. Meier

Corresponding Author

Prof. Beat H. Meier

Physical Chemistry, ETH Zurich, 8093 Zurich, Switzerland

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Dr. Anja Böckmann

Corresponding Author

Dr. Anja Böckmann

Molecular Microbiology and Structural Biochemistry, Labex Ecofect, UMR 5086 CNRS/Université de Lyon, 69367 Lyon, France

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First published: 13 February 2017
Citations: 49

Graphical Abstract

Metal location: Both EPR and solid-state NMR spectra change on the substitution of Mg2+ by Mn2+ in two different ATP:Mg2+ fueled protein engines. While EPR spectra report metal binding and metal-center geometry, NMR paramagnetic relaxation enhancements localize residues at the binding site. Both techniques indicate the location of paramagnetic ions in proteins.

Abstract

Paramagnetic metal ions deliver structural information both in EPR and solid-state NMR experiments, offering a profitable synergetic approach to study bio-macromolecules. We demonstrate the spectral consequences of Mg2+/ Mn2+ substitution and the resulting information contents for two different ATP:Mg2+-fueled protein engines, a DnaB helicase from Helicobacter pylori active in the bacterial replisome, and the ABC transporter BmrA, a bacterial efflux pump. We show that, while EPR spectra report on metal binding and provide information on the geometry of the metal centers in the proteins, paramagnetic relaxation enhancements identified in the NMR spectra can be used to localize residues at the binding site. Protein engines are ubiquitous and the methods described herein should be applicable in a broad context.

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