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Updated: May 16, 2026

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
Published on: September 17, 2017
Structural characterization of supramolecular assemblies by ¹³C spin dilution and 3D solid-state NMR
Birgit Habenstein1, Antoine Loquet, Karin Giller
1Department of NMR-based Structural Biology, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany.
Abstract:
(13)C spin diluted protein samples can be produced using [1-(13)C] and [2-(13)C]-glucose (Glc) carbon sources in the bacterial growth medium. The (13)C spin dilution results in favorable (13)C spectral resolution and polarization transfer behavior. We recently reported the combined use of [1-(13)C]- and [2-(13)C]-Glc labeling to facilitate the structural analysis of insoluble and non-crystalline biological systems by solid-state NMR (ssNMR), including sequential assignment, detection of long-range contacts and structure determination of macromolecular assemblies. In solution NMR the beneficial properties of sparsely labeled samples using [2-(13)C]-glycerol ((13)C labeled Cα sites on a (12)C diluted background) have recently been exploited to provide a bi-directional assignment method (Takeuchi et al. in J Biomol NMR 49(1):17-26, 2011 ). Inspired by this approach and our own recent results using [2-(13)C]-Glc as carbon sources for the simplification of ssNMR spectra, we present a strategy for a bi-directional sequential assignment of solid-state NMR resonances and additionally the detection of long-range contacts using the combination of (13)C spin dilution and 3D NMR spectroscopy. We illustrate our results with the sequential assignment and the collection of distance restraints on an insoluble and non-crystalline supramolecular assembly, the Salmonella typhimurium type III secretion system needle.
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