Accurate automated protein NMR structure determination using unassigned NOESY data

TitleAccurate automated protein NMR structure determination using unassigned NOESY data
Publication TypeJournal Article
Year of Publication2010
AuthorsRaman, S., Huang Y. J., Mao B., Rossi P., Aramini J. M., Liu G., Montelione G. T., & Baker D.
JournalJournal of the American Chemical Society
Volume132
Issue1
Pagination202-7
Date Published2010 Jan 13
ISSN1520-5126
KeywordsAutomation, Crystallography, X-Ray, Models, Molecular, Nuclear Magnetic Resonance, Biomolecular, Primary Publication, Protein Conformation, Proteins
Abstract

Conventional NMR structure determination requires nearly complete assignment of the cross peaks of a refined NOESY peak list. Depending on the size of the protein and quality of the spectral data, this can be a time-consuming manual process requiring several rounds of peak list refinement and structure determination. Programs such as Aria, CYANA, and AutoStructure can generate models using unassigned NOESY data but are very sensitive to the quality of the input peak lists and can converge to inaccurate structures if the signal-to-noise of the peak lists is low. Here, we show that models with high accuracy and reliability can be produced by combining the strengths of the high-resolution structure prediction program Rosetta with global measures of the agreement between structure models and experimental data. A first round of models generated using CS-Rosetta (Rosetta supplemented with backbone chemical shift information) are filtered on the basis of their goodness-of-fit with unassigned NOESY peak lists using the DP-score, and the best fitting models are subjected to high resolution refinement with the Rosetta rebuild-and-refine protocol. This hybrid approach uses both local backbone chemical shift and the unassigned NOESY data to direct Rosetta trajectories toward the native structure and produces more accurate models than AutoStructure/CYANA or CS-Rosetta alone, particularly when using raw unedited NOESY peak lists. We also show that when accurate manually refined NOESY peak lists are available, Rosetta refinement can consistently increase the accuracy of models generated using CYANA and AutoStructure.

Alternate JournalJ. Am. Chem. Soc.
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raman10A.pdf3.49 MB