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Journal of Biomolecular NMR

, Volume 56, Issue 2, pp 155–167 | Cite as

Practical use of chemical shift databases for protein solid-state NMR: 2D chemical shift maps and amino-acid assignment with secondary-structure information

  • K. J. Fritzsching
  • Y. Yang
  • K. Schmidt-Rohr
  • Mei HongEmail author
Article

Abstract

We introduce a Python-based program that utilizes the large database of 13C and 15N chemical shifts in the Biological Magnetic Resonance Bank to rapidly predict the amino acid type and secondary structure from correlated chemical shifts. The program, called PACSYlite Unified Query (PLUQ), is designed to help assign peaks obtained from 2D 13C–13C, 15N–13C, or 3D 15N–13C–13C magic-angle-spinning correlation spectra. We show secondary-structure specific 2D 13C–13C correlation maps of all twenty amino acids, constructed from a chemical shift database of 262,209 residues. The maps reveal interesting conformation-dependent chemical shift distributions and facilitate searching of correlation peaks during amino-acid type assignment. Based on these correlations, PLUQ outputs the most likely amino acid types and the associated secondary structures from inputs of experimental chemical shifts. We test the assignment accuracy using four high-quality protein structures. Based on only the Cα and Cβ chemical shifts, the highest-ranked PLUQ assignments were 40–60 % correct in both the amino-acid type and the secondary structure. For three input chemical shifts (CO–Cα–Cβ or N–Cα–Cβ), the first-ranked assignments were correct for 60 % of the residues, while within the top three predictions, the correct assignments were found for 80 % of the residues. PLUQ and the chemical shift maps are expected to be useful at the first stage of sequential assignment, for combination with automated sequential assignment programs, and for highly disordered proteins for which secondary structure analysis is the main goal of structure determination.

Keywords

Chemical shift correlation Amino-acid type assignment PLUQ Secondary structure Protein resonance assignment 

Notes

Acknowledgments

This research was supported by NIH grant GM088204. We are grateful to Mr. Wonghee Lee for correcting parsing errors in the original PACSY database.

Supplementary material

10858_2013_9732_MOESM1_ESM.pdf (10.3 mb)
Supplementary material 1 (PDF 10578 kb)

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • K. J. Fritzsching
    • 1
  • Y. Yang
    • 1
  • K. Schmidt-Rohr
    • 1
  • Mei Hong
    • 1
    Email author
  1. 1.Department of ChemistryIowa State UniversityAmesUSA

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