Journal of Biomolecular NMR

, Volume 48, Issue 2, pp 71–83

Mapping of protein structural ensembles by chemical shifts

  • Kumaran Baskaran
  • Konrad Brunner
  • Claudia E. Munte
  • Hans Robert Kalbitzer
Article

Abstract

Applying the chemical shift prediction programs SHIFTX and SHIFTS to a data base of protein structures with known chemical shifts we show that the averaged chemical shifts predicted from the structural ensembles explain better the experimental data than the lowest energy structures. This is in agreement with the fact that proteins in solution occur in multiple conformational states in fast exchange on the chemical shift time scale. However, in contrast to the real conditions in solution at ambient temperatures, the standard NMR structural calculation methods as well chemical shift prediction methods are optimized to predict the lowest energy ground state structure that is only weakly populated at physiological temperatures. An analysis of the data shows that a chemical shift prediction can be used as measure to define the minimum size of the structural bundle required for a faithful description of the structural ensemble.

Keywords

Chemical shift Solution structure Structural ensemble 

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Kumaran Baskaran
    • 1
  • Konrad Brunner
    • 1
  • Claudia E. Munte
    • 1
  • Hans Robert Kalbitzer
    • 1
    • 2
  1. 1.Department of Biophysics and Physical BiochemistryUniversity of RegensburgRegensburgFederal Republic of Germany
  2. 2.Institut für Biophysik und Physikalische Biochemie, Lehrstuhl BiophysikUniversität RegensburgRegensburgFederal Republic of Germany

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