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Old 12-23-2017, 06:08 PM
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Default Application of Paramagnetic Relaxation Enhancements to Accelerate the Acquisition of 2D and 3D Solid-State NMR Spectra of Oriented Membrane Proteins

Application of Paramagnetic Relaxation Enhancements to Accelerate the Acquisition of 2D and 3D Solid-State NMR Spectra of Oriented Membrane Proteins

Publication date: Available online 22 December 2017
Source:Methods

Author(s): Songlin Wang, T. Gopinath, Gianluigi Veglia

Oriented sample solid-state NMR (OS-ssNMR) spectroscopy is uniquely suited to determine membrane protein topology at the atomic resolution in liquid crystalline bilayers under physiological temperature. However, the inherent low sensitivity of this technique has hindered the throughput of multidimensional experiments necessary for resonance assignments and structure determination. In this work, we show that doping membrane protein bicelle preparations with paramagnetic ion chelated lipids and exploiting paramagnetic relaxation effects it is possible to accelerate the acquisition of both 2D and 3D multidimensional experiments with significant saving in time. We demonstrate the efficacy of this method for a small membrane protein, sarcolipin, reconstituted in DMPC/POPC/DHPC oriented bicelles. In particular, using Cu2+-DMPE-DTPA as a dopant, we observed a decrease of 1H T1 of sarcolipin by 2/3, allowing us to reduce the recycle delay up to 3 times. We anticipate that these new developments will enable the routine acquisition of multidimensional OS-ssNMR experiments.







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