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Default Spatially encoded strategies in the execution of biomolecular-oriented 3D NMR experiments

Spatially encoded strategies in the execution of biomolecular-oriented 3D NMR experiments
Mor Mishkovsky, Maayan Gal and Lucio Frydman
Journal of Biomolecular NMR; 2007; 39(4); pp 291-301

Abstract:

Three-dimensional nuclear magnetic resonance (3D NMR) provides one of the foremost analytical tools available for the elucidation of biomolecular structure, function and dynamics. Executing a 3D NMR experiment generally involves scanning a series of time-domain signals S(t 3), as a function of two time variables (t 1, t 2) which need to undergo parametric incrementations throughout independent experiments. Recent years have witnessed extensive efforts towards the acceleration of this kind of experiments. Among the different approaches that have been proposed counts an “ultrafast” scheme, which distinguishes itself from other propositions by enabling—at least in principle—the acquisition of the complete multidimensional NMR data set within a single transient. 2D protein NMR implementations of this single-scan method have been demonstrated, yet its potential for 3D acquisitions has only been exemplified on model organic compounds. This publication discusses a number of strategies that could make these spatial encoding protocols compatible with 3D biomolecular NMR applications. These include a merging of 2D ultrafast NMR principles with temporal 2D encoding schemes, which can yield 3D HNCO spectra from peptides and proteins within ≈100 s timescales. New processing issues that facilitate the collection of 3D NMR spectra by relying fully on spatial encoding principles are also assessed, and shown capable of delivering HNCO spectra within 1 s timescales. Limitations and prospects of these various schemes are briefly addressed.
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