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We demonstrate a novel 3D NNC magic angle spinning NMR experiment that generates 15 N- 15 N internuclear contacts in protein systems using an optimized 15 N- 15 N proton assisted recoupling (PAR) mixing period and a 13 C dimension for improved resolution. The optimized PAR condition permits the acquisition of high signal-to-noise 3D data that enables backbone chemical shift assignments using a strategy that is complementary to current schemes. The spectra can also provide distance constraints. The utility of the experiment is demonstrated on an M 0 Aβ 1-42 fibril sample that yields high-quality data that is readily assigned and interpreted. The 3D NNC experiment therefore provides a powerful platform for solid-state protein studies and is broadly applicable to a variety of systems and experimental conditions.

3D MAS NMR Experiment Utilizing Through-Space 15N–15N Correlations

3D MAS NMR Experiment Utilizing Through-Space ¹⁵N–¹⁵N Correlations