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Default Accuracy and precision of protein structures determined by magic angle spinning NMR spectroscopy: for some ‚??with a little help from a friend‚??

Accuracy and precision of protein structures determined by magic angle spinning NMR spectroscopy: for some ‚??with a little help from a friend‚??

Abstract

We present a systematic investigation into the attainable accuracy and precision of protein structures determined by heteronuclear magic angle spinning solid-state NMR for a set of four proteins of varied size and secondary structure content. Structures were calculated using synthetically generated random sets of C-C distances up to 7¬*√? at different degrees of completeness. For single-domain proteins, 9‚??15 restraints per residue are sufficient to derive an accurate model structure, while maximum accuracy and precision are reached with over 15 restraints per residue. For multi-domain proteins and protein assemblies, additional information on domain orientations, quaternary structure and/or protein shape is needed. As demonstrated for the HIV-1 capsid protein assembly, this can be accomplished by integrating MAS NMR with cryoEM data. In all cases, inclusion of TALOS-derived backbone torsion angles improves the accuracy for small number of restraints, while no further increases are noted for restraint completeness above 40%. In contrast, inclusion of TALOS-derived torsion angle restraints consistently increases the precision of the structural ensemble at all degrees of distance restraint completeness.



Source: Journal of Biomolecular NMR
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