title: Sequence-specific resonance assignments in the 1H nuclear-magnetic-resonance spectrum of the lac repressor DNA-binding domain 1-51 from Escherichia coli by two-dimensional spectroscopy.
abstract: The assignment of the 1H nuclear magnetic resonance (NMR) spectrum of the DNA-binding domain 1-51 of lac repressor from Escherichia coli is described and documented. The assignments are based entirely on the amino acid sequence and on two-dimensional NMR experiments at 360 MHz and 500 MHz. Individual assignments were obtained at 18 degrees C for the backbone protons of 44 out of the total of 51 amino acids residues, the exceptions being Met-1, Lys-2, Tyr-7, Arg-35, Glu-36, Lys-37 and Ile-48. Complete assignments of the non-labile hydrogen atoms of the side chain were obtained for 33 residues, and for Asn-46 and Asn-50 the delta amide protons were also identified. The chemical shifts for the assigned resonances at 18 degrees C are listed for an aqueous solution at pH 4.9 and at pH 6.8.
mesh_terms: D000595:Amino Acid Sequence; D000596:Amino Acids / Q000032:analysis; D001426:Bacterial Proteins / Q000378:metabolism; D001665:Binding Sites; D055598:Chemical Phenomena; D002621:Chemistry; D004247:DNA / Q000378:metabolism; D004926:Escherichia coli / Q000378:metabolism; D009682:Magnetic Resonance Spectroscopy; D011485:Protein Binding; D012097:Repressor Proteins / Q000378:metabolism; D013057:Spectrum Analysis / Q000379:methods; D014157:Transcription Factors / Q000378:metabolism
chemical_list: D000596:Amino Acids; D001426:Bacterial Proteins; D012097:Repressor Proteins; D014157:Transcription Factors; D004247:DNA