title: Crystallization and preliminary X-ray analysis of an Escherichia coli purine repressor-hypoxanthine-DNA complex.
abstract: The purine repressor (PurR) is a DNA-binding protein, which together with a purine corepressor serves to regulate de novo purine and pyrimidine biosynthesis in Escherichia coli. PurR belongs to the structurally homologous lac repressor family of transcription regulators. A PurR-hypoxanthine-DNA complex has been crystallized, with DNA encompassing the high affinity purF operator site and which is 16 base-pairs long with 5'-deoxynucleoside overhangs on each complementary strand. The crystals diffract to better than 2.6 A and take the orthorhombic space group C222(1), with unit cell dimensions a = 175.9 A, b = 94.8 A and c = 81.8 A. The structure determination of this PurR-hypoxanthine-DNA complex will provide the first high resolution view of a Lacl member-DNA complex.
authors.affiliation: Department of Biochemistry and Molecular Biology, Oregon Health Sciences University, Portland 97201-3098.
authors.forename: M A
authors.initials: MA
authors.lastname: Schumacher
authors.forename: K Y
authors.initials: KY
authors.lastname: Choi
authors.forename: H
authors.initials: H
authors.lastname: Zalkin
authors.forename: R G
authors.initials: RG
authors.lastname: Brennan
mesh_terms: D001426:Bacterial Proteins / Q000737:chemistry* / Q000378:metabolism; D001483:Base Sequence; D003460:Crystallization; D018360:Crystallography, X-Ray; D004269:DNA, Bacterial / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D004926:Escherichia coli / Q000737:chemistry; D029968:Escherichia coli Proteins; D019271:Hypoxanthine; D007042:Hypoxanthines / Q000737:chemistry* / Q000378:metabolism; D008969:Molecular Sequence Data; D015394:Molecular Structure; D009875:Operator Regions, Genetic / Q000235:genetics; D012097:Repressor Proteins / Q000737:chemistry* / Q000378:metabolism
chemical_list: D001426:Bacterial Proteins; D004269:DNA, Bacterial; D029968:Escherichia coli Proteins; D007042:Hypoxanthines; C065825:PurR protein, Bacteria; C489317:PurR protein, E coli; D012097:Repressor Proteins; D019271:Hypoxanthine