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A strategy for simplified and complete resonance assignment of insoluble and noncrystalline proteins by solid-state NMR (ssNMR) spectroscopy is presented. Proteins produced with [1-(13)C]- or [2-(13)C]glucose are very sparsely labeled, and the resulting 2D ssNMR spectra exhibit smaller line widths (by a factor of ∼2 relative to uniformly labeled proteins) and contain a reduced number of cross-peaks. This allows for an accelerated and straightforward resonance assignment without the necessity of time-consuming 3D spectroscopy or sophisticated pulse sequences. The strategy aims at complete backbone and side-chain resonance assignments based on bidirectional sequential walks. The approach was successfully demonstrated with the de novo assignment of the Type Three Secretion System PrgI needle protein. Using a limited set of simple 2D experiments, we report a 97% complete resonance assignment of the backbone and side-chain (13)C atoms.

13C Spin Dilution for Simplified and Complete Solid-State NMR Resonance Assignment of Insoluble Biological Assemblies

¹³C Spin Dilution for Simplified and Complete Solid-State NMR Resonance Assignment of Insoluble Biological Assemblies