title: Molecular characterization of guanosine kinase gene from a facultative alkalophile, Exiguobacterium aurantiacum ATCC 35652.
abstract: Guanosine kinase activity was identified in an alkalophile, Exiguobacterium aurantiacum ATCC 35652, and the gsk gene encoding it was isolated as a homologous fragment of the Brevibacterium acetylicum gsk. The cloned chromosomal fragment contained an open reading frame which encodes a polypeptide of 308 amino acids with a molecular mass of 33349 Da. The Ex. aurantiacum Gsk shows strong sequence similarity to B. acetylicum Gsk, but possesses five additional amino acids at the C-terminus. An Mr 39200 protein synthesized in Escherichia coli harboring plasmids carrying Ex. aurantiacum gsk was purified and characterized. A 0.9 kb transcript revealed by Northern blot analysis and the presence of a factor-independent terminator structure suggest that Ex. aurantiacum gsk is monocistronic, although B. acetylicum gsk has been shown to be bicistronic. The striking alterations in the 3'-untranslated region resulted in a different gene organization.
authors.affiliation: Central Research Laboratories, Ajinomoto Co., Inc., 1-1 Suzuki-cho, Kawasaki-ku, Kawasaki-shi 210-8681, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Usuda
authors.forename: H
authors.initials: H
authors.lastname: Kawasaki
authors.forename: M
authors.initials: M
authors.lastname: Shimaoka
authors.forename: T
authors.initials: T
authors.lastname: Utagawa
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D004926:Escherichia coli; D006094:Gram-Positive Bacteria / Q000201:enzymology* / Q000235:genetics*; D006863:Hydrogen-Ion Concentration; D008969:Molecular Sequence Data; D008970:Molecular Weight; D017853:Phosphotransferases (Alcohol Group Acceptor) / Q000096:biosynthesis / Q000737:chemistry / Q000235:genetics*; D011994:Recombinant Proteins / Q000096:biosynthesis / Q000737:chemistry; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D012689:Sequence Homology, Nucleic Acid
chemical_list: D011994:Recombinant Proteins; D017853:Phosphotransferases (Alcohol Group Acceptor); C055032:guanosine kinase