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Journal of Biomolecular NMR

, Volume 38, Issue 4, pp 289–302 | Cite as

Protein backbone chemical shifts predicted from searching a database for torsion angle and sequence homology

  • Yang Shen
  • Ad Bax
Article

Abstract

Chemical shifts of nuclei in or attached to a protein backbone are exquisitely sensitive to their local environment. A computer program, SPARTA, is described that uses this correlation with local structure to predict protein backbone chemical shifts, given an input three-dimensional structure, by searching a newly generated database for triplets of adjacent residues that provide the best match in ϕ/ψ/χ1 torsion angles and sequence similarity to the query triplet of interest. The database contains 15N, 1HN, 1Hα, 13Cα, 13Cβ and 13C′ chemical shifts for 200 proteins for which a high resolution X-ray (≤2.4 Å) structure is available. The relative importance of the weighting factors for the ϕ/ψ/χ1 angles and sequence similarity was optimized empirically. The weighted, average secondary shifts of the central residues in the 20 best-matching triplets, after inclusion of nearest neighbor, ring current, and hydrogen bonding effects, are used to predict chemical shifts for the protein of known structure. Validation shows good agreement between the SPARTA-predicted and experimental shifts, with standard deviations of 2.52, 0.51, 0.27, 0.98, 1.07 and 1.08 ppm for 15N, 1HN, 1Hα, 13Cα, 13Cβ and 13C′, respectively, including outliers.

Keywords

Backbone Chemical shift Database Empirical Prediction TALOS 

Notes

Acknowledgement

We thank Dr. Frank Delaglio for helpful discussions and comments on the coding, and testing of SPARTA, and Dr. Jinfa Ying for sharing the results of DFT calculations of the relation between chemical shift and geometry distortion. This work was supported by the Intramural Research Program of the NIDDK, NIH, and by the Intramural AIDS-Targeted Antiviral Program of the Office of the Director, NIH.

Supplementary material

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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  1. 1.Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney DiseasesNational Institutes of HealthBethesdaUSA

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