Segmental differences in the stability of the trp-repressor peptide backbone.
Exchange lifetimes of amide protons in trp-repressor with and without the corepressor, L-tryptophan, were studied by heteronuclear 2D NMR spectroscopy. The amide proton exchange times revealed pronounced differences in the stability of different regions of the trp-repressor. The dimeric core of the molecule is relatively compact and homogeneous in terms of the measured parameters in both apo- and holorepressors. On the other hand the DNA-binding region appears less stable and more susceptible to the exchange of its backbone protons with the solvent. The NMR findings reported here are consistent with and amplify information on the stability of the trp-repressor obtained by other methods.
Czaplicki
J
J
Stanford Magnetic Resonance Laboratory, Stanford University, CA 94305-5055.
Arrowsmith
C
C
Jardetzky
O
O
D000595:Amino Acid Sequence; D001426:Bacterial Proteins; D003196:Computer Graphics; D003198:Computer Simulation; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D008958:Models, Molecular; D008969:Molecular Sequence Data; D011487:Protein Conformation; D012097:Repressor Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D014364:Tryptophan / Q000378:metabolism; D029968:Escherichia coli Proteins
D001426:Bacterial Proteins; D012097:Repressor Proteins; D014364:Tryptophan; C027190:TRPR protein, E coli; D029968:Escherichia coli Proteins