Abstract
One of the fundamental challenges in the application of solid-state NMR is its limited sensitivity, yet a majority of experiments do not make efficient use of the limited polarization available. The loss in polarization in a single acquisition experiment is mandated by the need to select out a single coherence pathway. In contrast, sequential acquisition strategies can encode more than one pathway in the same experiment or recover unused polarization to supplement a standard experiment. In this article, we present pulse sequences that implement sequential acquisition strategies on one and two radiofrequency channels with a combination of proton and carbon detection to record multiple experiments under magic-angle spinning. We show that complementary 2D experiments such as \(\hbox {C}_{\mathrm{x}} \hbox {H}_{\mathrm{x}}\) and \(\hbox {NH}_{\scriptscriptstyle {\mathrm{N}}}\) or DARR and \(\hbox {NH}_{\scriptscriptstyle {\mathrm{N}}}\), and 3D experiments such as \(\hbox {NC}_\upalpha \hbox {H}_\upalpha\) and \(\hbox {C}_\upalpha \hbox {NH}_{\scriptscriptstyle {\mathrm{N}}}\), or \(\hbox {NC}_\upalpha \hbox {C}_{\mathrm{x}}\) and \(\hbox {C}_\upalpha \hbox {NH}_{\scriptscriptstyle {\mathrm{N}}}\) can be combined in a single experiment to ensure time savings of at least 40 %. These experiments can be done under fast or slow-moderate magic-angle spinning frequencies aided by windowed \(^{1}\hbox {H}\) acquisition and homonulcear decoupling. The pulse sequence suite is further expanded by including pathways that allow the recovery of residual polarization, the so-called ‘afterglow’ pathways, to encode a number of pulse sequences to aid in assignments and chemical-shift mapping.
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Acknowledgments
We thank the National NMR Facility at TIFR, Mumbai, where all the experiments were done, Manoj Naik (TIFR, Mumbai) for technical assistance and Bappaditya Chandra (TIFR, Mumbai) and Prof. Sudipta Maiti (TIFR, Mumbai) for sharing the amyloid-\(\upbeta\) samples. Dr. Vipin Agarwal (TCIS, TIFR, Hyderabad) is thanked for discussions. KRM acknowledges TCIS, TIFR, Hyderabad, for support under the Young Researcher Programme and The Department of Science and Technology (DST), India, for funding under the Inspire Faculty Scheme.
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Sharma, K., Madhu, P.K. & Mote, K.R. A suite of pulse sequences based on multiple sequential acquisitions at one and two radiofrequency channels for solid-state magic-angle spinning NMR studies of proteins. J Biomol NMR 65, 127–141 (2016). https://doi.org/10.1007/s10858-016-0043-z
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DOI: https://doi.org/10.1007/s10858-016-0043-z