Cited by 536Bacterial Genetics and BiotechnologyEscherichia coli research studiesIron Metabolism and Disorders

Operator sequences of the aerobactin operon of plasmid ColV-K30 binding the ferric uptake regulation (fur) repressor

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de Lorenzo, V, Wee, S, Herrero, M, Neilands, J B·1987·Journal of Bacteriology

Abstract

The promoter region of the pColV-K30-encoded operon specifying biosynthesis and transport of the siderophore aerobactin was subjected to deletion analysis to determine the smallest DNA sequence affording iron regulation of a iucA'-'lacZ gene fusion. A 78-base-pair (bp) region containing the main (P1) promoter retained the character of inducibility under iron starvation. A 250-bp fragment carrying this sequence was examined for protection against DNase I by the Fur protein, the product of a gene (fur) required for negative control of several iron-regulated functions. The DNase I footprints, in the presence of various divalent heavy-metal ions added as corepressors, revealed two contiguous binding sites with different lengths and affinities for Fur. Increased concentrations of the protein appeared to elicit formation of repressor oligomers which bind to the upstream and downstream regions of the P1 promoter in a metal-dependent fashion, but with a presently undefined stoichiometry. The primary site for Fur binding spans 31 bp and contains two overlapping symmetry dyads which share the sequence 5'-TCATT-3'. It also contains extensive homology with a 19-bp consensus sequence for iron-regulated genes as deduced from comparison with the fhuA and fepA putative promoter sequences.

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Crossref · 10.1128/jb.169.6.2624-2630.1987

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Authors
de Lorenzo, V, Wee, S., Herrero, M., & Neilands, J. B.
Affiliations
University of California, Berkeley (US)
Venue
Journal of Bacteriology
Published
1987-06
Volume
169
Issue
6
Pages
2624-2630
ISSN
  • 0021-9193 (ISSN-L)
  • 1098-5530
OpenAlex
W2131282911
Cited by
536
References
22
Citations by year
2026: 2 · 2025: 3 · 2024: 7 · 2023: 5 · 2022: 6 · 2021: 8 · 2020: 9 · 2019: 4 · 2018: 8 · 2017: 6 · 2016: 13 · 2015: 12 · 2014: 11 · 2013: 9 · 2012: 21
FWCI
14.06
Type
journal article
Language
en
Open access
Locations
  • Journal of Bacteriology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Ministerio de Economía y Competitividad
  • National Institutes of Health (1f05tw003577-01)
  • U.S. Public Health Service (A104156)
  • Fogarty International Center (1F05TWO3577-01-BI-5)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Bacterial Genetics and Biotechnology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Endocrinology › Escherichia coli research studies
  • Health Sciences › Medicine › Hematology › Iron Metabolism and Disorders
Keywords
Fur repressor, iron regulation, promoter, DNase I footprinting, repressor binding sites, consensus sequence, siderophore biosynthesis, Escherichia coli
MeSH terms
Bacterial Proteins, Chromosome Deletion, Cloning, Molecular, Bacteriocin Plasmids, Escherichia coli, Gene Expression Regulation, Hydroxamic Acids, Iron, Operator Regions, Genetic, Operon, Promoter Regions, Genetic, Recombinant Fusion Proteins, Repressor Proteins, Transcription Factors

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