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Related Experiment Videos

Empirical isotropic chemical shift surfaces.

Eszter Czinki1, Attila G Császár

  • 1Laboratory of Molecular Spectroscopy, Institute of Chemistry, Eötvös University, P. O. Box 32, Budapest 112, H-1518 Hungary.

Journal of Biomolecular NMR
|June 27, 2007
PubMed
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Researchers developed empirical chemical shift surfaces to identify protein secondary structures. These surfaces, derived from protein data bank and BMRB data, aid in determining protein structures.

Area of Science:

  • Biophysics
  • Structural Biology
  • Computational Chemistry

Background:

  • Protein Data Bank (PDB) provides spatial structures, while Biological Magnetic Resonance Bank (BMRB) offers isotropic chemical shift (ICS) data.
  • Dihedral angles (phi and psi) characterize protein backbone structure but often have unknown uncertainties.
  • Ab initio calculations of ICS(phi,psi) surfaces for model peptides provide a basis for empirical surface generation.

Purpose of the Study:

  • To develop empirical isotropic chemical shift (ICS) surfaces for all 20 naturally occurring alpha-amino acids.
  • To identify protein secondary structure types using these empirical ICS surfaces.
  • To assess the utility of empirical 13C(alpha)-1H(alpha) ICS(phi,psi) surfaces for protein structure determination.

Main Methods:

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  • Combined experimental ICS data from RefDB/BMRB with ab initio ICS(phi,psi) surfaces from model peptides (For-(L-Ala)(n)-NH(2)).
  • Generated empirical ICS(phi,psi) surfaces for major nuclei of 20 alpha-amino acids.
  • Focused on 13C(alpha)-1H(alpha) ICS(phi,psi) surfaces for secondary structure identification.

    • Main Results:

    • Empirical ICS(phi,psi) surfaces were successfully generated for all 20 alpha-amino acids.
    • The 13C(alpha)-1H(alpha) ICS(phi,psi) surface shows promise for identifying alpha-helix, beta-strand, left-handed helix (alpha(D)), and polyproline-II structures.
    • Alanine (Ala) was found to be a suitable model for many other amino acids.

    Conclusions:

    • Empirical 13C(alpha)-1H(alpha) ICS(phi,psi) surfaces are valuable tools for identifying major protein secondary structure types.
    • These surfaces, derived from experimental and computational data, can provide useful constraints for protein structure determination.
    • The study highlights the potential of using chemical shift data in conjunction with structural information for advancing protein structure analysis.