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Protein Science, Vol 6, Issue 12 2624-2627, Copyright © 1997 by Cold Spring Harbor Laboratory Press
FOR THE RECORD |
P. RAJAGOPAL, E. B. WAYGOOD, J. REIZER, M. H. SAIER-JR. and R. E. KLEVIT
University of Washington, Biomolecular Structure Center and Department of Biochemistry, Seattle, Washington 98195-7742
Chemical shift mapping is becoming a popular method for studying protein-protein interactions in solution. The technique is used to identify putative sites of interaction on a protein surface by detecting chemical shift perturbations in simple ((1)H, (15)N)-HSQC NMR spectra of a uniformly labeled protein as a function of added (unlabeled) target protein. The high concentrations required for these experiments raise questions concerning the possibility for non-specific interactions being detected, thereby compromising the information obtained. We demonstrate here that the simple chemical shift mapping approach faithfully reproduces the known functional specificities among pairs of closely related proteins from the phosphoenolpyruvate:sugar phosphotransferase systems of Escherichia coli and Bacillus subtilis.
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