title: Cloning, nucleotide sequence and expression in Escherichia coli of two cobalt-containing nitrile hydratase genes from Rhodococcus rhodochrous J1.
abstract: Rhodococcus rhodochrous J1 produces two kinds of cobalt-containing nitrile hydratases (NHases); one is a high molecular mass-NHase (H-NHase) and the other is a low molecular mass-NHase (L-NHase). Both NHases are composed of two subunits of different sizes (alpha and beta subunits). The H- and L-NHase genes were cloned into Escherichia coli by a DNA-probing method using the NHase gene of Rhodococcus sp. N-774, a ferric ion-containing NHase producing strain, as the hybridization probe and their nucleotide sequences were determined. In each of the H- and L-NHase genes, the open reading frame for the beta subunit was located just upstream of that for the alpha subunit, which probably belongs to the same operon. The amino acid sequences of each subunit of the H- and L-NHases from R. rhodochrous J1 showed generally significant similarities to those from Rhodococcus sp. N-774, but the arrangement of the coding sequences for two subunits is reverse of the order found in the NHase gene of Rhodococcus sp. N-774. Each of the NHase genes was expressed in E. coli cells under the control of lac promoter, only when they were cultured in the medium supplemented with CoCl2.
authors.affiliation: Department of Agricultural Chemistry, Faculty of Agriculture, Kyoto University, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Kobayashi
authors.forename: M
authors.initials: M
authors.lastname: Nishiyama
authors.forename: T
authors.initials: T
authors.lastname: Nagasawa
authors.forename: S
authors.initials: S
authors.lastname: Horinouchi
authors.forename: T
authors.initials: T
authors.lastname: Beppu
authors.forename: H
authors.initials: H
authors.lastname: Yamada
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D015153:Blotting, Western; D003001:Cloning, Molecular; D003035:Cobalt / Q000494:pharmacology*; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D015964:Gene Expression Regulation, Bacterial / Q000187:drug effects*; D006836:Hydro-Lyases / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D007763:Lac Operon / Q000235:genetics; D008969:Molecular Sequence Data; D010957:Plasmids / Q000235:genetics; D011401:Promoter Regions, Genetic / Q000235:genetics; D011994:Recombinant Proteins / Q000096:biosynthesis / Q000235:genetics; D012240:Rhodococcus / Q000201:enzymology* / Q000235:genetics; D016415:Sequence Alignment; D012689:Sequence Homology, Nucleic Acid; D014169:Transformation, Bacterial / Q000235:genetics
chemical_list: D011994:Recombinant Proteins; D003035:Cobalt; D006836:Hydro-Lyases; C048831:nitrile hydratase