title: Cocrystals of Escherichia coli trp repressor bound to an alternative operator DNA sequence.
abstract: Cocrystals of a 2:1 complex of trp repressor dimers with a DNA duplex containing a single, central operator half-site sequence are described. Crystals with different morphologies grew under diverse crystallization conditions within days to weeks by hanging-drop vapor-diffusion. Twinned rods split along their longitudinal cleft produce single crystals with space group C2 and unit cell dimensions a = 112.34 A, b = 90.16 A, c = 58.65 A and beta = 113.92 degrees. The crystals diffract to 2.4 A and are thus suitable for structural analysis by X-ray diffraction. Several heavy-atom derivative cocrystals have been obtained with iodouridine-substituted DNAs.
authors.affiliation: Chemistry Department, Princeton University, NJ 08544-1009.
authors.forename: J
authors.initials: J
authors.lastname: Carey
authors.forename: N
authors.initials: N
authors.lastname: Combatti
authors.forename: D E
authors.initials: DE
authors.lastname: Lewis
authors.forename: C L
authors.initials: CL
authors.lastname: Lawson
mesh_terms: D001426:Bacterial Proteins / Q000737:chemistry* / Q000378:metabolism; D001483:Base Sequence; D001665:Binding Sites; D003460:Crystallization; D018360:Crystallography, X-Ray; D004268:DNA-Binding Proteins / Q000737:chemistry* / Q000378:metabolism; D004926:Escherichia coli / Q000235:genetics*; D008969:Molecular Sequence Data; D009875:Operator Regions, Genetic; D012097:Repressor Proteins / Q000737:chemistry* / Q000378:metabolism; D029968:Escherichia coli Proteins
chemical_list: D001426:Bacterial Proteins; D004268:DNA-Binding Proteins; D012097:Repressor Proteins; C027190:TRPR protein, E coli; D029968:Escherichia coli Proteins