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J Magn Reson. 2017 Aug;281:125-129. doi: 10.1016/j.jmr.2017.05.016. Epub 2017 May 31.

Optimized fast mixing device for real-time NMR applications.

Author information

1
Institut de Biologie Structurale, Université Grenoble Alpes, CEA, CNRS, 71 avenue des Martyrs, 38044 Grenoble Cedex 9, France.
2
Institut de Biologie Structurale, Université Grenoble Alpes, CEA, CNRS, 71 avenue des Martyrs, 38044 Grenoble Cedex 9, France. Electronic address: bernhard.brutscher@ibs.fr.

Abstract

We present an improved fast mixing device based on the rapid mixing of two solutions inside the NMR probe, as originally proposed by Hore and coworkers (J. Am. Chem. Soc. 125 (2003) 12484-12492). Such a device is important for off-equilibrium studies of molecular kinetics by multidimensional real-time NMR spectrsocopy. The novelty of this device is that it allows removing the injector from the NMR detection volume after mixing, and thus provides good magnetic field homogeneity independently of the initial sample volume placed in the NMR probe. The apparatus is simple to build, inexpensive, and can be used without any hardware modification on any type of liquid-state NMR spectrometer. We demonstrate the performance of our fast mixing device in terms of improved magnetic field homogeneity, and show an application to the study of protein folding and the structural characterization of transiently populated folding intermediates.

KEYWORDS:

Fast mixing; Protein folding; Real-time NMR; SOFAST; β2-microglobulin

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