Isolation and identification of Fur binding genes in Escherichia coli.
Fur (ferric uptake regulation) binding fragments were isolated by in vitro binding of purified Fur protein with Sau3AI-digested genomic DNA fragments. The Fur-bound DNA fragments were filtered on nitrocellulose paper, isolated, cloned, and sequenced. The protein binding was confirmed by gel retardation assay for five DNA fragments. The sequence data were used to identify the genes by comparison with the GenBank data. The proposed Fur binding regions lie on or near the putative promoter regions of marAB (multiple antibiotic resistance), pyrC (dihydroorotase), mreB (mecillinam resistance) and an unidentified gene (ecouw93) near argI and in the middle of the treBC (trehalose permease enzyme II) coding region. The proposed Fur binding sites of the known iron regulating operators including the genes of this work are AAT(pyrimidine) and A(purine)TT. The two conserved sequences are 10 bases apart and palindromic to each other, which might suggest the classical pattern of protein binding toward one side of the DNA in contrast to the concept of the Fur protein wrapping around the DNA.
Oh
M
M
Department of Genetic Engineering, Hallym University, Chunchon, Korea.
Chai
S H
SH
Wee
S
S
D001426:Bacterial Proteins / Q000737:chemistry / Q000378:metabolism*; D001483:Base Sequence; D001665:Binding Sites; D004269:DNA, Bacterial / Q000737:chemistry / Q000378:metabolism*; D004268:DNA-Binding Proteins / Q000737:chemistry / Q000378:metabolism*; D004926:Escherichia coli / Q000235:genetics* / Q000378:metabolism; D015964:Gene Expression Regulation, Bacterial; D005798:Genes, Bacterial; D007501:Iron / Q000378:metabolism; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D009875:Operator Regions, Genetic; D010641:Phenotype; D011401:Promoter Regions, Genetic / Q000235:genetics; D011485:Protein Binding; D011487:Protein Conformation; D012097:Repressor Proteins / Q000737:chemistry / Q000378:metabolism*; D012689:Sequence Homology, Nucleic Acid
D001426:Bacterial Proteins; D004269:DNA, Bacterial; D004268:DNA-Binding Proteins; D012097:Repressor Proteins; C068477:ferric uptake regulating proteins, bacterial; D007501:Iron