title: The solution structure of the histidine-containing protein (HPr) from Staphylococcus aureus as determined by two-dimensional 1H-NMR spectroscopy.
abstract: The three-dimensional solution structure of the heat-stable phosphocarrier protein HPr from Staphylococcus aureus was determined from two-dimensional NMR data by restrained molecular dynamics. It consists of a large twisted antiparallel beta-pleated sheet with four strands A, B, C, and D of amino acids 2-7, 34-37, 40-42 and 60-65. Three right-handed helices A, B, C (amino acids 18-27, 47-53 and 71-85) are positioned on top of this sheet. The aromatic ring of His15 is located in a cleft formed by amino acids 12-17 and 55-58, only the nitrogen (N delta 1) atom which can be phosphorylated by enzyme I is exposed to the water. The side chains of Thr12 and Arg17 are located close to the histidine ring. The regulatory serine residue (Ser46) is located in a hydrophobic patch, its hydroxyl group is water-accessible but forms hydrogen bonds with the amide groups of the backbone. The general features of the three-dimensional structure are similar to those found in HPr proteins from different microorganisms such as Escherichia coli, Bacillus subtilis and Streptococcus faecalis.
authors.affiliation: Max-Planck-Institute for Medical Research, Department of Biophysics, Heidelberg, Germany.
authors.forename: H R
authors.initials: HR
authors.lastname: Kalbitzer
authors.forename: W
authors.initials: W
authors.lastname: Hengstenberg
mesh_terms: D000596:Amino Acids / Q000737:chemistry; D001426:Bacterial Proteins / Q000737:chemistry*; D006639:Histidine / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D010731:Phosphoenolpyruvate Sugar Phosphotransferase System / Q000737:chemistry*; D011487:Protein Conformation; D017433:Protein Structure, Secondary; D012694:Serine / Q000737:chemistry; D013211:Staphylococcus aureus / Q000737:chemistry*
chemical_list: D000596:Amino Acids; D001426:Bacterial Proteins; D012694:Serine; D006639:Histidine; D010731:Phosphoenolpyruvate Sugar Phosphotransferase System; C030182:phosphocarrier protein HPr