title: Oxygen resistant strain of N2-fixing Escherichia coli.
abstract: Oxygen resistant N2-fixing Escherichia coli, which can grow at a high oxygen concentration in a nitrogen-free medium, were produced by several times of cultivation under a condition of 0.03% oxygen. Six isolated resistant strains could grow at an oxygen concentration ten times that of the parent strain. The nif-genes of these six strains were integrated into a chromosome. At low oxygen, they showed one third the nitrogenase activity to the parent strain, but more so at a high oxygen concentration. It is thus evident that the amount of nitrogenase protein in a cell is a factor determining the oxygen resistance of nitrogenase.
authors.affiliation: Fermentation Research Institute, Agency of Industrial Science and Technology, Ibaraki, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Iwahashi
authors.forename: J
authors.initials: J
authors.lastname: Someya
mesh_terms: D002876:Chromosomes, Bacterial / Q000648:ultrastructure; D004269:DNA, Bacterial / Q000235:genetics; D004274:DNA, Recombinant; D004926:Escherichia coli / Q000235:genetics; D015964:Gene Expression Regulation, Bacterial; D005798:Genes, Bacterial; D009586:Nitrogen Fixation / Q000235:genetics*; D009591:Nitrogenase / Q000235:genetics*; D010100:Oxygen / Q000494:pharmacology*; D010957:Plasmids
chemical_list: D004269:DNA, Bacterial; D004274:DNA, Recombinant; D009591:Nitrogenase; D010100:Oxygen