title: Purification, crystallization and preliminary X-ray diffraction studies of recombinant class A non-specific acid phosphatase of Salmonella typhimurium.
abstract: The phoN gene of Salmonella enterica sv. Typhimurium strain MD6001 was cloned in the multicopy plasmid pBluescript SK(-). The nucleotide sequence of the cloned gene differs from the corresponding S. typhimurium LT2 sequence at 23 residues, leading to 15 amino-acid differences, but was very close to the S. typhi phoN sequence (only three nucleotide and two amino-acid differences). The recombinant PhoN protein was purified to homogeneity. Two forms of crystals were harvested from a single crystallization condition. Diffraction intensity data were collected using a laboratory X-ray source to resolution limits of 2.5 and 2.8 A for crystals belonging to space group C2 and C222(1), respectively. Based on non-crystallographic symmetry, four monomers of PhoN are expected to be present in the asymmetric unit of the C2 unit cell. Two monomers of a biologically active dimer in the asymmetric unit of the C222(1) unit cell are expected from the Matthews coefficient.
authors.affiliation: Synchrotron Radiation Section, Bhabha Atomic Research Centre, Mumbai 400 085, India.
authors.forename: R D
authors.initials: RD
authors.lastname: Makde
authors.forename: Vinay
authors.initials: V
authors.lastname: Kumar
authors.forename: A S
authors.initials: AS
authors.lastname: Rao
authors.forename: V S
authors.initials: VS
authors.lastname: Yadava
authors.forename: S K
authors.initials: SK
authors.lastname: Mahajan
mesh_terms: D000135:Acid Phosphatase / Q000737:chemistry* / Q000235:genetics / Q000302:isolation & purification; D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D003460:Crystallization; D004925:Escherichia / Q000737:chemistry / Q000378:metabolism; D008969:Molecular Sequence Data; D011994:Recombinant Proteins / Q000737:chemistry / Q000302:isolation & purification; D012486:Salmonella typhimurium / Q000201:enzymology* / Q000235:genetics; D014961:X-Ray Diffraction
chemical_list: D011994:Recombinant Proteins; D000135:Acid Phosphatase