Complete protein structure determination using backbone residual dipolar couplings and sidechain rotamer prediction

  • Michael Andrec
  • Yuichi Harano
  • Matthew P. Jacobson
  • Richard A. Friesner
  • Ronald M. Levy
Article

Abstract

Residual dipolar couplings provide significant structural information for proteins in the solution state, which makes them attractive for the rapid determination of protein structures. While dipolar couplings contain inherent structural ambiguities, these can be reduced via an overlap similarity measure that insists that protein fragments assigned to overlapping regions of the sequence must have self-consistent structures. This allows us to determine a backbone fold (including the correct Cα–Cβ bond orientations) using only residual dipolar coupling data from one ordering medium. The resulting backbone structures are of sufficient quality to allow for modeling of sidechain rotamer states using a rotamer prediction algorithm and a force field employing the Surface Generalized Born continuum solvation model. We demonstrate the applicability of the method using experimental data for ubiquitin. These results illustrate the synergies that are possible between protein structural database and molecular modeling methods and NMR spectroscopy, and we expect that the further development of these methods will lead to the extraction of high resolution structural information from minimal NMR data.

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Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • Michael Andrec
    • 1
  • Yuichi Harano
    • 1
  • Matthew P. Jacobson
    • 2
  • Richard A. Friesner
    • 2
  • Ronald M. Levy
    • 1
  1. 1.Department of Chemistry and Chemical Biology, RutgersThe State University of New JerseyPiscatawayUSA
  2. 2.Department of ChemistryColumbia UniversityNew YorkUSA

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