title: Iron-dependent transcription of the regulatory gene ros of Agrobacterium radiobacter.
abstract: Transcription of the regulatory gene ros of Agrobacterium radiobacter requires growth in the presence of Fe although this regulation was not mediated by ros itself. The ros gene repressed its own transcription, independently of the Fe status of the growth media. It was shown that the two cysteine residues in the Ros protein were essential for the complementation of the exopolysaccharide synthesis defect of ros mutant strains. It was found that the mutation in one exo mutant strain that was complemented both by ros and by the "structural" exoY gene was not, in fact, in ros but is in some other, unknown gene. The two cysteines were also essential for the correction of this mutant. This mutant affected the expression of exoY but not of ros.
authors.affiliation: School of Biological Sciences, University of East Anglia, Norwich, UK.
authors.forename: H
authors.initials: H
authors.lastname: Hussain
authors.forename: A W
authors.initials: AW
authors.lastname: Johnston
mesh_terms: D000483:Alleles; D000595:Amino Acid Sequence; D001426:Bacterial Proteins; D001483:Base Sequence; D002244:Carbon / Q000378:metabolism; D003545:Cysteine / Q000737:chemistry; D004274:DNA, Recombinant; D004268:DNA-Binding Proteins / Q000737:chemistry / Q000235:genetics*; D015964:Gene Expression Regulation, Bacterial; D005809:Genes, Regulator; D007501:Iron / Q000378:metabolism*; D008969:Molecular Sequence Data; D009154:Mutation; D012097:Repressor Proteins / Q000737:chemistry / Q000235:genetics*; D012231:Rhizobium / Q000235:genetics* / Q000378:metabolism; D014158:Transcription, Genetic
chemical_list: D001426:Bacterial Proteins; D004274:DNA, Recombinant; D004268:DNA-Binding Proteins; D012097:Repressor Proteins; D002244:Carbon; D007501:Iron; D003545:Cysteine