Identification of genes for growth with oxygen in Escherichia coli by operon fusion and southern blot techniques

Il Man Kim, Yongchan Lee, Jaeseon Won, Muhyeon Choe

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Seven Escherichia coli cells defective with aerobic growth were isolated by the insertion of λplacMu53, a hybrid bacteriophage of λ and Mu, which created a transcriptional fusion to lacZY These insertion mutant cells were tested on an XG (5-bromo-4-chloro-3-indolyl-β-D-galactopyranoside) medium for anaerobic expression of lacZ by fusion to a promoter. The chromosomal DNA from these strains were digested by EcoRI, and the EcoRI fragments that contained the fused gene and lacZ sequence were identified by Southern hybridization, using lacZ containing plasmid as a probe. The EcoRI fragment from each strain was cloned and sequenced. The sequence data were compared with the GenBank database. The mutated gene of three strains, CYT4, CYT5, and OS11, was found to be identical, and it was nrdAB that encoded ribonucleoside diphosphate reductase. The gene nrdAB was at min 50.5 on the Escherichia coli linkage map and 2,348,084 on the physical map, and is involved in heme-related reduction-oxidation reaction. OS6 and OS14 mutant strains had insertion at min 8.3 and the mutated gene was hemB. The hemB encodes 5-aminolevulinate dehydratase or porphobilinogen synthase. The OS3 mutant had insertion in cydB at min 16.6. The cydAB encodes cytochrome d oxidase. In the case of OS1, the fusion was made with sucA, the E1 component of α-ketoglutarate dehydrogenase.

Original languageEnglish
Pages (from-to)976-983
Number of pages8
JournalJournal of microbiology and biotechnology
Volume13
Issue number6
Publication statusPublished - 2003 Dec

Keywords

  • Oxidative stress
  • cydAB
  • hemB
  • nrdAB
  • λplacMu53

ASJC Scopus subject areas

  • Biotechnology
  • Applied Microbiology and Biotechnology

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