title: Structure of the arginine repressor from Bacillus stearothermophilus.
abstract: The arginine repressor (ArgR) is a hexameric DNA-binding protein that plays a multifunctional role in the bacterial cell. Here, we present the 2.5 A structure of apo-ArgR from Bacillus stearothermophilus and the 2.2 A structure of the hexameric ArgR oligomerization domain with bound arginine. This first view of intact ArgR reveals an approximately 32-symmetric hexamer of identical subunits, with six DNA-binding domains surrounding a central oligomeric core. The difference in quaternary organization of subunits in the arginine-bound and apo forms provides a possible explanation for poor operator binding by apo-ArgR and for high affinity binding in the presence of arginine.
authors.affiliation: Department of Biochemistry & Biophysics and Johnson Research Foundation, University of Pennsylvania School of Medicine, Philadelphia 19104, USA.
authors.forename: J
authors.initials: J
authors.lastname: Ni
authors.forename: V
authors.initials: V
authors.lastname: Sakanyan
authors.forename: D
authors.initials: D
authors.lastname: Charlier
authors.forename: N
authors.initials: N
authors.lastname: Glansdorff
authors.forename: G D
authors.initials: GD
authors.lastname: Van Duyne
mesh_terms: D000595:Amino Acid Sequence; D001120:Arginine / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology; D001426:Bacterial Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D001665:Binding Sites; D003460:Crystallization; D018360:Crystallography, X-Ray; D004268:DNA-Binding Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D001411:Geobacillus stearothermophilus / Q000737:chemistry* / Q000235:genetics; D008958:Models, Molecular; D008969:Molecular Sequence Data; D009875:Operator Regions, Genetic / Q000235:genetics; D010446:Peptide Fragments / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D011485:Protein Binding / Q000187:drug effects; D011487:Protein Conformation / Q000187:drug effects; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D012097:Repressor Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D012997:Solvents
chemical_list: C087018:ArgR protein, Bacteria; D001426:Bacterial Proteins; D004268:DNA-Binding Proteins; D010446:Peptide Fragments; D011994:Recombinant Proteins; D012097:Repressor Proteins; D012997:Solvents; D001120:Arginine