title: Isolation of the dxr gene of Zymomonas mobilis and characterization of the 1-deoxy-D-xylulose 5-phosphate reductoisomerase.
abstract: The gene encoding the second enzyme of the 2C-methyl-D-erythritol 4-phosphate (MEP) pathway for isopentenyl diphosphate biosynthesis, 1-deoxy-D-xylulose 5-phosphate (DXP) reductoisomerase, was cloned and sequenced from Zymomonas mobilis. The deduced amino acid sequence showed the highest identity (48.2%) to the DXP reductoisomerase of Escherichia coli. Biochemical characterization of the purified DXP reductoisomerase showed a strict dependence of the enzyme on NADPH and divalent cations (Mn(2+), Co(2+) or Mg(2+)). The enzyme is a dimer with a molecular mass of 39 kDa per subunit and has a specific activity of 19.5 U mg protein(-1). Catalysis of the intramolecular rearrangement and reduction of DXP to MEP is competitively inhibited by the antibiotic fosmidomycin with a K(i) of 0.6 microM.
authors.affiliation: Institut für Biotechnologie 1, Forschungszentrum Jülich GmbH, 52425, Jülich, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Grolle
authors.forename: S
authors.initials: S
authors.lastname: Bringer-Meyer
authors.forename: H
authors.initials: H
authors.lastname: Sahm
mesh_terms: D019747:Aldose-Ketose Isomerases / Q000235:genetics* / Q000302:isolation & purification / Q000378:metabolism*; D003001:Cloning, Molecular; D004591:Electrophoresis, Polyacrylamide Gel; D005798:Genes, Bacterial; D008969:Molecular Sequence Data; D009097:Multienzyme Complexes / Q000235:genetics* / Q000302:isolation & purification / Q000378:metabolism*; D010088:Oxidoreductases / Q000235:genetics* / Q000302:isolation & purification / Q000378:metabolism*; D010957:Plasmids / Q000235:genetics; D017422:Sequence Analysis, DNA; D017355:Zymomonas / Q000201:enzymology* / Q000235:genetics / Q000254:growth & development
chemical_list: D009097:Multienzyme Complexes; D010088:Oxidoreductases; C114231:1-deoxy-D-xylulose 5-phosphate reductoisomerase; D019747:Aldose-Ketose Isomerases