title: Protein preparation, crystallization and preliminary X-ray crystallographic analysis of Smu.1475c from caries pathogen Streptococcus mutans.
abstract: The gene smu.1475c encodes a putative protein of 211 residues in Streptococcus mutans, a primary pathogen for human dental caries. In this work, smu.1475c was cloned into pET28a and expressed in good amount from the E. coli strain BL21 (DE3). Smu.1475c protein was purified to homogeneity in a two-step procedure of Ni2+ chelating and size exclusion chromatography. Crystals were obtained by hanging-drop vapor-diffusion method and diffracted to 2.7 angstroms resolution. The crystal belongs to orthorhombic space group P2(1)2(1)2(1) with cell dimension of a = 68.3 angstroms, b = 105.9 angstroms, c = 136.2 angstroms. The asymmetric unit is expected to contain four molecules with solvent content of 49.4%.
authors.affiliation: National Laboratory of Protein Engineering and Plant Genetic Engineering, College of Life Sciences, Peking University, Beijing 100871, China.
authors.forename: Yan-Feng
authors.initials: YF
authors.lastname: Zhou
authors.forename: Wei
authors.initials: W
authors.lastname: Mi
authors.forename: Lanfen
authors.initials: L
authors.lastname: Li
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Zhang
authors.forename: Yu-He
authors.initials: YH
authors.lastname: Liang
authors.forename: Xiao-Dong
authors.initials: XD
authors.lastname: Su
authors.forename: Shicheng
authors.initials: S
authors.lastname: Wei
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000096:biosynthesis* / Q000737:chemistry* / Q000235:genetics; D003001:Cloning, Molecular; D003460:Crystallization; D018360:Crystallography, X-Ray; D003731:Dental Caries / Q000382:microbiology; D008969:Molecular Sequence Data; D011994:Recombinant Proteins / Q000096:biosynthesis / Q000737:chemistry / Q000235:genetics; D013295:Streptococcus mutans / Q000378:metabolism*
chemical_list: D001426:Bacterial Proteins; D011994:Recombinant Proteins