Journal of Biomolecular NMR

, Volume 2, Issue 2, pp 149–160 | Cite as

Multidimensional1H and15N NMR investigation of glutamine-binding protein ofEscherichia coli

  • Nico Tjandra
  • Virgil Simplaceanu
  • Patricia F. Cottam
  • Chien Ho
Research Papers

Summary

Specific and uniform15N labelings along with site-directed mutagenesis of glutamine-binding protein have been utilized to obtain assignments of the His156, Trp32 and Trp.220 residues. These assignments have been made not only to further study the importance of these 3 amino acid residues in protein-ligand and protein-protein interactions associated with the active transport ofl-glutamine across the cytoplasmic membrane ofEscherichia coli, but also to serve as the starting points in the sequence-specific backbone assignment. The assignment of H2 of His156 refines the earlier, model where this particular proton formas an intermolecular hydrogen bond to the δ-carbonyl ofl-glutamine, while assignments of both Trp32 and Trp220 show the variation in local structures which ensure the specificity in ligand binding and protein-protein interaction. Using 3D NOESY-HMQC NMR, amide connectivities can be traced along 8–9 amino acid residues at a time. This paper illustrates the usefulness of combining15N isotopic labeling and multinuclear, multidimensional NMR techniques for a structural investigation of a protein with a molecular weight of 25 000.

Keywords

Backbone assignment 3D NMR Heteronuclear NMR NOESY 1H NMR 15N NMR Binding protein 

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Copyright information

© ESCOM Science Publishers B.V 1992

Authors and Affiliations

  • Nico Tjandra
    • 1
  • Virgil Simplaceanu
    • 1
  • Patricia F. Cottam
    • 1
  • Chien Ho
    • 1
  1. 1.Department of Biological SciencesCarnegie Mellon UniversityPittsburghUSA

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