Demonstration of protein-protein interaction specificity by NMR chemical shift mapping.
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 (1H, 15N)-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.
Rajagopal
P
P
University of Washington, Biomolecular Structure Center, Seattle, Washington 98195-7742, USA.
Waygood
E B
EB
Reizer
J
J
Saier
M H
MH
Klevit
R E
RE
D001412:Bacillus subtilis / Q000201:enzymology; D001426:Bacterial Proteins; D001665:Binding Sites; D003460:Crystallization; D004926:Escherichia coli / Q000201:enzymology; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D015394:Molecular Structure; D010731:Phosphoenolpyruvate Sugar Phosphotransferase System / Q000737:chemistry* / Q000378:metabolism*; D011485:Protein Binding; D012996:Solutions; D013379:Substrate Specificity
D001426:Bacterial Proteins; D012996:Solutions; D010731:Phosphoenolpyruvate Sugar Phosphotransferase System; C030182:phosphocarrier protein HPr; C031629:phosphoenolpyruvate-glucose phosphotransferase