title: Regulation of the isofunctional genes ubiD and ubiX of the ubiquinone biosynthetic pathway of Escherichia coli.
abstract: The expressions of the isofunctional genes ubiD and ubiX of the ubiquinone biosynthetic pathway of Escherichia coli were compared under a variety of growth conditions and in several genetic backgrounds. LacZ operon fusions were constructed and were inserted in single copies into strain MC4100 and into its fnr, arcA or hemA carrying derivatives. During aerobic growth the expressions of both ubiD and ubiX depended on the carbon source: succinate>glycerol>glucose. Mutations in fnr, arcA or hemA increased the expressions of both genes. During anaerobic growth in LB medium glucose strongly inhibited the expression of ubiD but not of ubiX.
authors.affiliation: Department of Biochemistry, Loma Linda University School of Medicine, Loma Linda, CA 92354, USA.
authors.forename: Haitao
authors.initials: H
authors.lastname: Zhang
authors.forename: G T
authors.initials: GT
authors.lastname: Javor
mesh_terms: D001483:Base Sequence; D002262:Carboxy-Lyases / Q000235:genetics* / Q000378:metabolism*; D004926:Escherichia coli / Q000201:enzymology* / Q000235:genetics*; D029968:Escherichia coli Proteins / Q000235:genetics* / Q000378:metabolism*; D015964:Gene Expression Regulation, Bacterial; D015971:Gene Expression Regulation, Enzymologic; D017930:Genes, Reporter; D008969:Molecular Sequence Data; D010957:Plasmids; D014451:Ubiquinone / Q000096:biosynthesis* / Q000737:chemistry
chemical_list: D029968:Escherichia coli Proteins; D014451:Ubiquinone; C415986:3-octaprenyl-4-hydroxybenzoate carboxy-lyase; D002262:Carboxy-Lyases; C113304:ubiX protein, E coli